Line Boring Tools
Portable Line boring Machine Equipment to repair holes on heavy equipment.  CLICK FOR HOMEPAGE.

Portable Line Boring Machine Equipment for easy concentric bore repair of holes on Backhoes, Dozers, Endloaders, Scrapper Hitches, Tractors, Excavators, machine frames, etc - using a standard magnetic drill press.

Photo of John Deere backhoePhoto of John Deere excavatorPhoto of Caterpillar compacterPhoto of Caterpillar dozerPhoto of Caterpillar Scaper
American Machine Tools Company is accedited by the Better Business Bureau! Click to verify. We accept credit cards for up to $10,000. Lineas Maquinado en Espanol

Photo shows our 72 inch Line Boring System boring 4 holes in line on a large bucket.

Customer photo shows our 72" boring bar reboring 4 holes in line on a large bucket. The mag drill is held by our weld-on safety base in case of power failure. Also notice the 2 just bored and sleeved holes above.

Photo shows Case boom dis-assembled and getting rebored.
All you need is our line boring equipment, a mag drill, welder, grinder and you can do it. But avoid the dangers of long hair and loose clothing.

Q150 & Q175 Line Boring Systems - with drill base adapter:
Made in Chicago, Illinois, USA. The most economical equipment to rebore holes round and concentric again. One year warranty against defects in American craftsmanship.The Q150 and Q175 setups include everything you need for reboring most holes. It is intended for repairing holes up to 8 inch diameter in heavy construction equipment such as cranes, backhoes, endloaders, excavators and tractors powered by your variable speed magnetic drill press with a 3/4 inch drill chuck. It can also be used to rebore holes in machinery frames, steel mill ladles, bridge support pivots, etc. Our 1.500" diameter and 1.750" diameter boring bars hold standard 1/2" square shank carbide lathe machine cutting tools. The bearing that is built into our Adapter Base bearing will hold the boring shaft load to prevent overloading the bearings in your mag drill. For 2014 we now add extra mounting holes to allow a flange bearing to be bolted directly underneath. The Adapter Base also clamps the magnetic drill in case of power failure. A jacking screw is provided for positioning. Approved by Milwaukee Tool Company Engineers for use with their magnetic drill press. Our boring bars are made from chrome induction hardened high tensile strength alloy steel to last a lifetime. Without a thick layer of chrome plating, your boring bar will need to be sanded and/or oiled regularly to prevent rust. That is why we sell only chrome plated boring shafts. No maintenance required. We also can supply .875, 1.00, 1.25 1.50 and 1.75 diameter boring bars separately. Prices do not include shipping cost. Most equipment is in stock. Scroll down to see all our different size kits, photos, videos, instructions and options.

VIDEOS:

Click to see a customer's VIDEO of our Q150-S Line Boring Machine

Click to see a 2nd customer's VIDEO of our Q150-L Line Boring Equipment

Click to see a 3rd customer's VIDEO of our Q150-E Portable Line Boring

Click to see a VIDEO of our Bore Welder mounted to the Q150

Line Boring Bars Separately: Our boring bars are chrome plated induction hardened high tensile strength alloy steel. Most sizes normally in stock.
PRICES for BORING BARS only:
0.875 diameter x 29 inches long: $395. (for holes 1 to 1.50 inch diameter).
1.000 diameter x 36 inches long: $425. (for holes 1.12 to 1.50 inch diameter).
1.250 diameter x 36 inches long: $495. (for holes 1.50 to 4 inch diameter).
1.250 diameter x 60 inches long: $795.
1.500 diameter x 36 inches long: $595. (for holes 1.75 to 5.5 inch diameter).
1.500 diameter x 54 inches long: $895.
1.500 diameter x 72 inches long: $1095.
1.750 diameter x 48 inches long: $895. (for holes 2 to 5.5 inch diameter).
1.750 diameter x 96 inches long: $1495.
Cutters, bearings and shipping cost is extra.
Q150-S Line Boring Kit: $2195.
Bores single holes or 2 holes in-line from 1.75 to 5.5 inches diameter spaced to about 20 inches apart.
Q150-S portable Line Boring Machine includes equipment carrying case - now with dolly wheels (new!)
Click to request more information be sent to you
Powered by your magnetic drill with 3/4" drill chuck.
Optional Milwaukee Portable Magnetic Drill Press with chuck: $1595. (Variable speed, 11" stroke. See below)
Optional Adaptor, large Cones & Bearing Plates to bore up to 8 inches diameter: $695. extra
Optional Q88A 7/8" x 36" Boring Bar Kit
for use with Q150 equipment. Bores holes 1" to 1.5" diameter: $750.

Optional BOA-408-AMT Bore Welder: $6595. extra
Optional Measuring Tools: for bore sizing and cutter positioning - scroll down below for info, photos, prices
1.50" dia x 36" long Boring Bar - made from highest quality chrome induction hardened and precision ground 100,000 PSI tensile strength alloy steel. The chrome resists burrs and scoring to still fit the bearings use after use. Cutting Bit mounting holes are spaced 5 inches apart. 3/4" shank with 3 flats for solid gripping by your drill chuck.
1 Drill Base Adapter with built-in bearing -
Important safety device to hold the magnetic drill press in case of power failure. The built-in bearing takes the load of the boring shaft to prevent overloading the internal drill press bearings. Includes mounting hole for BOA-408-AMT bore welder.
2 Self-aligning Bearings - the I.D. of the bearings have a perfect fit between bar and bearings, which insures holes can be bored to near zero TIR runout.
2 Bearing Plates and 4 Standoffs - 3/4 inch thick for easy weld on and vibration free machining.
2 Centering Cones - for quick concentric alignment of the boring bar and bearings in larger holes.
2 Positioning Sleeves - for quick concentric alignment of the boring bar and bearings in smaller holes.
7 Bore Cutting Tools - 3 types of boring, 1 chamfering and 1 facing. Held in the boring shaft by heavy set screws.
1 Dial Caliper - Measures 0" to 8" with dial readout to .001" in/mm
1 Telescoping Bore Gage Set - To measure the diameter of your holes.
1 Wood case - now with dolly wheels.

Photo of American Machine Tools Q150-L Portable Line Boring Bar and Equipment in transport box with dolly wheels.
Rebores multiple holes in-line from 1.75 to 5.5 inches diameter spaced up to 38" apart.
(44mm to 140mm diameter holes up to 965mm apart). 8 inch boring option available.
Q150-L:
$2595. Call 773-334-5000 to order this equipment. Ships within 2 days.
Click to request a formal quote and more information be sent to you

The standard Q150-L comes complete with everything you need except the mag drill:

1.50" dia x 54" long Boring Bar - made from highest quality chrome hardened and precision ground 100,000 PSI tensile strength alloy steel. The chrome resists burrs and scoring to still fit the bearings use after use. Cutting Bit mounting holes are spaced 5 inches apart. 3/4 diameter shank with 3 flats for solid gripping by your mag drill chuck.
3 bolt-on self-aligning Bearings - the I.D. of the bearings have a perfect fit between bar and bearings, which insures holes can be bored to near zero TIR runout.
3 Bolt-on Bearing Mounting Plates and 4 pairs of Standoffs - 3/4 inch thick for easy weld on and vibration free machining. Easy to unbolt for measuring or welding. Black oxide coated to prevent rust. One of the Bearing Mounting Plates is extra long for use at the end of a boom or to mount the optional bore welder.
1 Drill Base Adapter with built-in bearing -
Important safety device to hold the magnetic drill press in case of power failure. The built-in bearing takes the load of the boring shaft to prevent overloading the internal drill press bearings. Includes mounting hole for BOA-408-AMT bore welder.
2 Centering Sleeves - for concentric alignment of the boring bar and bearings in small holes.
2 Positioning Cones - for quick concentric alignment of the boring bar and bearings in larger holes.
7 Carbide Cutting Tools - 3 types of boring, 1 chamfering, 1 facing. Held in the boring shaft by heavy set screws. Modifiable cutters are long enough to rebore 5.5" diameter.
1 Dial Caliper - Measures 0" to 8" with dial readout to .001"
1 Caliper Jaw Extensions - Extend the jaws of the Digital Caliper to easily measure holes.
1 Telescoping Bore Gage Set - To measure the diameter of your holes.
1 Elastic Bunge Cord - Use as power feed to pull drill handle or to dampen boring bar vibration.
1 Solid Wood Case - Padlockable, with 2 handles, and dolly wheels.

SCROLL WAY DOWN TO SEE PHOTOS OF OPTIONS.

Optional Milwaukee Portable Magnetic Drill Press with chuck: $1595. (see below)
Variable speed, 11" stroke. You need this if you do not already have a mag drill with 3/4" chuck.
Optional Adaptor Kit to bore up to 8 inches (200mm) diameter (with positioning cones for 5" to 8" diameter and extra long bearing mounting plates): $695. extra
Optional BOA-408-AMT Bore Welder Attachment: $6595. extra

Optional 36" long short bar for easy short distance boring: $595. extra
Optional 18" long extra short bar for single hole boring: $275. extra
Optional Q88A 7/8" x 29" Boring Bar Kit for use with Q150 equipment -
bores holes from 1" to 1.5" diameter up to 15" apart. Also includes adapter bushings and centering cones: $750.
Optional Ajustable measuring/centering tools: $95. each
- these mount inside boring bar
Optional Clamping Coller Set: $119. extra - reduce vibration in holes 3.5 to 5.5" dia.

Optional Cutting Tool Positioner: $199. - this adjusts the cutter height within .001"
Optional Cutting Tool Dial Indicator & Bracket: $195. - set your cutter height within .001"
Extra Cutting Tools: $12. each (minumum purchase is quantity of 10)


Rebores multiple holes in-line from 1.75 to 5.5 inches diameter spaced up to 56" apart.
(44mm to 140mm diameter holes up to 1425mm apart). Rebores up to 8 inches (200mm) diameter with optional oversize boring kit. Call 1-773-334-5000. Ships within 2 days.
Q150-XLS:
$3295.
Click to request a formal quote and more information be sent to you

The standard Q150-XLS comes complete with everything you need except the mag drill:

1.50" dia x 72" long Boring Bar - made from highest quality chrome hardened and precision ground 100,000 PSI tensile strength alloy steel. The chrome resists burrs and scoring to still fit the bearings use after use. Cutting Bit mounting holes are spaced 5 inches apart. 3/4 diameter shank with 3 flats for solid gripping by your mag drill chuck.
1.50" dia x 36" long Boring Bar - for easy close hole boring.
3 bolt-on self-aligning Bearings - the I.D. of the bearings have a perfect fit between bar and bearings.
3 Bolt-on Bearing Mounting Plates and 4 pairs of Standoffs - 3/4 inch thick for easy weld on and vibration free machining. Easy to unbolt for measuring or welding. Black oxide coated to prevent rust. One of the Bearing Mounting Plates is extra long for use at the end of a boom or to mount the optional bore welder.
1 Drill Base Adapter with built-in bearing -
Important safety device to hold the magnetic drill press in case of power failure. The built-in bearing takes the load of the boring shaft to prevent overloading the internal drill press bearings. Includes mounting hole for BOA-408-AMT bore welder.
2 Centering Sleeves - for concentric alignment of the boring bar and bearings in small holes.
2 Positioning Cones - for quick concentric alignment of the boring bar and bearings in larger holes.
7 Carbide Cutting Tools - 3 types of boring, 1 chamfering, 1 facing. Held in the boring shaft by heavy set screws. Modifiable cutters are long enough to rebore 5.5" diameter.
1 Dial Caliper - Measures 0" to 8" with dial readout to .001"
1 Caliper Jaw Extensions - Extend the jaws of the Digital Caliper to easily measure holes.
1 Telescoping Bore Gage Set - To measure the diameter of your holes.
1 Elastic Bunge Cord - Use as power feed to pull drill handle or to dampen boring bar vibration.
1 Solid Wood Case - Padlockable, with 2 handles, and dolly wheels.

Photo of Q175-XLS
Q175-XLS:
$3995. Same as Q150XLS but includes 1.750 diameter (not 1.500) boring bars x 48 inch long and 96 inch long for extra strength and extra length. Also includes larger 1.750 bearings. Rebores holes from 2 inch (50mm) to 5.5 inch (138mm) diameter in line at least 80 inches (2 meters) apart. Uses 1/2 inch (12.5mm) carbide cutters. [Photo shows optional 8 inch capacity boring adapter and 8" cones]
Click to request a formal quote and more information be sent to you

SCROLL WAY DOWN TO SEE PHOTOS OF OPTIONS.

Optional Milwaukee Portable Magnetic Drill Press with chuck: $1595. (see below)
Variable speed, 11" stroke. You need this if you do not already have a mag drill with 3/4" chuck.
Optional BOA-408-AMT Bore Welder Attachment: $6595. extra

Optional Adaptor Kit to bore up to 8 inches (200mm) diameter
(with large positioning cones for 5" to 8" diameter and extra long bearing mounting plates): $695. extra
Optional 18" long extra short bar for single hole boring: $275. extra
Optional Q88A 7/8" x 29" Boring Bar Kit for use with Q150 equipment -
bores holes from 1" to 1.5" diameter up to 15" apart. Also includes adapter bushings and centering cones: $750.
Optional Q125A - 1.250 x 36" long Boring Bar Kit with bushings and cones for use with the Q150 or Q175 equipment
- bores holes from 1.5" to 4" diameter up to 20" apart: $850.
Optional Clamping Coller Set: $119. extra - reduce vibration in holes 3.5 to 5.5" dia.

Optional Ajustable measuring/centering tools: $95 each
- these mount inside boring bar
Optional Cutting Tool Positioner: $199. - this adjusts the cutter height within .001"
Optional Cutting Tool Dial Indicator & Bracket: $195. - set your cutter height within .001"
Extra Cutting Tools: $12. each (minumum purchase is quantity of 10)

Picture of Q150E which comes with the magnetic drill pressMagnetic Drill Press for Q150E

Q150-E5: $4890. Rebores holes in-line 1.75 to 5.5 inches (140mm) diameter.
includes Milwaukee Magnetic Drill Press with manual feed.
Q150-E8: $5475. Rebores holes in-line from 1.75 to 8 inches (200mm) diameter.
includes Milwaukee Magnetic Drill Press with manual feed.
Call 773-334-5000 to ask questions or order this equipment. Ships within 2 days.
Click to request a formal quote and more information be sent to you

Q150-E5 comes with:
1.50" dia x 72" long Boring Bar
- made from highest quality chrome hardened and precision ground 100,000 PSI tensile strength alloy steel. The chrome resists burrs and scoring to still fit the bearings use after use. Cutting Bit mounting holes are spaced 5 inches apart. 3/4 shank with 3 flats for solid gripping by the mag drill chuck.
1.50" dia x 36" long Boring Bar- for easy close hole boring.
1 Milwaukee Portable Magnetic Drill Press - with 3/4" chuck, 11" stroke
and variable speed.
1 Drill Base Adapter with built-in bearing -
Important safety device to hold the magnetic drill press in case of power failure. The built-in bearing takes the load of the boring shaft to prevent overloading the internal drill press bearings. Includes mounting hole for BOA-408-AMT bore welder.
3 Self-aligning Bearings - the I.D. of the bearings have a perfect fit between bar and bearings, which insures holes can be bored to near zero TIR runout.
3 Bolt-on Bearing Mounting Plates and 4 pairs of Standoffs - 3/4 inch thick for easy weld on and vibration free machining. Easy to unbolt for measuring or welding. Black oxide coated to prevent rust. One of the Bearing Mounting Plates is extra long for use at the end of a boom or to mount the optional bore welder.
2 Centering Sleeves - for concentric alignment of the boring bar and bearings in small holes.
2 Positioning Cones - for concentric alignment of the boring bar and bearings in holes up to 5".
7 Carbide Cutting Tools - 3 types of boring and 1 facing. Held in the boring shaft by heavy set screws, modifiable cutters are long to rebore up to rebore 5.5" diameter.
1 Dial Caliper - measures 0" to 8" with dial readout to .001"
1 Caliper Jaw Extensions - Extend the jaws of the Dial Caliper to easily measure holes.
1 Telescoping Bore Gage Set - To measure the diameter of your holes.
1 Elastic Bunge Cord - Use as power feed to pull drill handle or to dampen boring bar vibration.
1 Solid Wood Case - padlockable, with 2 handles, and dolly wheels.
Q150-E8 is same as E5 but also comes with:
1 Adaptor to bore up to 8 inches (200mm) diameter - heavy duty solid steel. Holds carbide cutter out far enough for reboring holes up to 8 inch diameter.
3 Extra wide bolt-on Bearing Plates - to bridge over 8" diameter holes.
2 Centering Cones
- for concentric alignment of the boring bar and bearings in holes 5" to 8".

Photo of Q175E Magnetic Drill Press for Q175E

Q175-E8: $5995. Same as Q150E8 but includes 1.750 diameter (not 1.500) boring bars x 48 inch long and 96 inch long for extra strength and extra length. Also includes larger 1.750 bearings. Rebores holes from 2 inch (50mm) to 8 inch (200mm) diameter in line at least 80 inches (2 meters) apart. Uses 1/2 inch (12.5mm) carbide cutters.
Click to request a formal quote and more information be sent to you

SCROLL WAY DOWN TO SEE PHOTOS OF OPTIONS.

Optional BOA-408-AMT Bore Welder Attachment: $6595. extra
Optional 18" long extra short bar for single hole boring: $275. extra
Optional Q88A - 7/8" x 29" Boring Bar Kit with bushings and centering cones for use with the Q150 equipment -
bores holes from 1" to 1.5" diameter up to 15" apart: $750.
Optional Q125A - 1.250 x 36" long Boring Bar Kit with bushings and cones for use with the Q150 or Q175 equipment
- bores holes from 1.5" to 4" diameter up to 20" apart:$850.
Optional Clamping Coller Set:
$119. extra
- reduce vibration in holes 3.5 to 5.5" dia.
Optional Ajustable measuring/centering tools: $95 each
- these mount inside boring bar
Optional Cutting Tool Positioner: $199. - this adjusts the cutter height within .001"
Optional Cutting Tool Dial Indicator & Bracket: $195. - set your cutter height within .001"
Optional Honing Tool : $97. - includes 220 grit & 100 grit honing stones
Optional Facing-Sanding Tool : $194. - includes 6 coarse & 3 medium sanding discs
Extra Cutting Tools: $12. each (minumum purchase is quantity of 10)

Picture shows how easy it is to set up and repair pivot holes on a bucket.

Customer photo showing how the bearing mounting plates are connected to standoffs that are tack welded in place. Notice the finished hole in the upper right.

Photo shows the Line Boring System boring 2 holes in line on a boom.


Customer photo shows our Q150S Line Boring Machine boring 2 holes in line with a Milwaukee Mag Drill. The manual feed allows you to control the pressure to save cutting bits. Or try using our bungee cord for a crude automatic feed.

Photo shows the Q150S attached to a customers mag drill turning a torch cut hole into a finished 6 inch diameter hole.

Photo shows the Q150S with oversize adapter attached to a customers mag drill turning a rough torched hole into a finished 6 inch diameter hole. We have 18" long boring bars.

Picture shows what was a rough torch cut hole turned into a finished 6 inch diameter hole.

Close up photo shows a finished 6 inch diameter hole that was also counterbored 1/16 deep by the Q150S. Hole was originally torch cut by customer then ground and bored out smooth.

Photo shows Q150 boring bar used in center pin holes.
Photo shows customer boring center pin holes. Notice he temporarily welded a plate in position to attach the drill press assembly.

Close up photo shows new center pins in newly bored holes. Line boring takes patience but with our tools its not rocket science.
Bore repair of center pin holes.
Customer photo: Bore repair of center pin holes.
Photo shows customers reboring link arm holes.
Photo shows customer reboring link arm holes.
Customer photo: Reboring holes while close to the ground.
Customer photo: ReBoring close to the ground.
Customer photo shows how he line bores from upside down!
Customer photo: Boring holes upside down!
Photo of Q88A add-on option for reboring 1 inch holes.
Customer is reboring 1 inch holes on a snowplow attachment using the Q88A add-on option.
ReBoring holes on the end of a boom.
Customer is ReBoring holes on the end of a boom using an extended bearing plate on left side.
Photo shows a very old magnetic drill press driving the Q150 equipment
Even the old magnetic drill shown above can line bore using the Q150 equipment.
Picture shows the Q150 line boring some very large mining equipment
Very few jobs are too big for the Q150 shown under the red Milwaukee magnetic drill press.
WD40 when line boring
If you dont have any cutting oil, you can substitute WD40. But it is important not to weld on top of oil because it will harden the weld.
Reboring center pin holes
Customer photo shows reboring of center pin holes using 3 bearings. One in the adapter base at top, one down below, and one in the middle.
Reboring with magnetic drill press Mag drill in our adapter base
Boring multiple holes in line Mag Drill doing bore repair

Photo of line bore equipment assembly

Customer's photo shows typical assembly of line bore equipment with Milwaukee magnetic drill. A chain was used to lift magnetic drill press in position. He used 3 bearings to reduce vibration of boring bar. If you look closely, you can just barely see the cabide cutting bit sticking out of the shaft next to the hole on the left side.

Line Boring machine equipment from American Machine Tools
Customer's photo shows another typical assembly of our line boring machine setup with the 72 inch shaft and the Milwaukee magnetic drill press.
Customer shows how he was multi-tasking by setting up the Q150 with Milwaukee magnetic drill to line bore from the right side and bore weld with the BOA-408-AMT from the left side.
Customer's multi-tasking photo shows how he set up the Q150 with Milwaukee magnetic drill to line bore from the right side and bore weld with the BOA-408-AMT from the left side.

BOA-408-AMT Welding Package $6995.
(only $6595 if purchased with a Q150 or Q175 Setup)

This bore welder system is for fast smooth perfect spiral welding in holes from 1.50" (32mm) to 8.0" (204mm) diameter. Connects to your Wire Feed MIG Welder with free adapter. Does a perfect spiral weld that is very easy to bore.
• Mounts to either end of all new Q150 line boring systems
• Connects to your MIG wire feeder and power supply
• Includes adapter to connect to your wire feed MIG welder.
• Pass-through drive system features telescoping, reversible torch extension with precision lead-screw feed ensures accurate, repeatable weld bead placement ensuring proper bead to bead and bead to base metal penetration (weld thickness is easily adjusted by increasing or decreasing torch speed and wire feed speed)
• Durable corrosion-resistant construction throughout
• Lockable clutch allows single-plane first welds
• Easily adapted to a variety of boring bar systems using standard BRS interchange kits
• Pivoting torch head allows system to weld in large range of bore sizes with no torch change
• All weld nozzles are electrically isolated, thread-on design
• All weld tips are straight thread-in design; easily replaced and inexpensive
• Excellent telephone tech support
Package includes:
• Adapter to fit your MIG welder
• Weld-on mounting bracket
• Custom heavy duty aluminum carrying/storage case
• Arc start / stop / interrupt switch
• Power cord • Operators manual • Tool kit
• One piece motion device and controller with eight position borewelder mount
• 1.25" stainless steel support tube
• Mini diffuser
• Mini nozzle (insulated)
• Standard diffuser
• (2) .8mm (.030") Stub tips
• (2) .8mm (.030") Standard tips
• Standard nozzle (insulated)
• Stub nozzle (insulated)
• Standard torch assembly with 24" extension tube and 120" conduit

Photo of holes being welded in line

Picture of BOA-308i-S1 welder

Options Available:
• Auto-skip upgrade (you can add this at a later date)
• Outside diameter welding torch for repairing pins
• Face welding torch
• Bore welder to boring bar interchange kit (allows units to share single support)
• MIG Power supply or wire feeder

Click to request more Bore Welder info be sent to you

Click to see VIDEO of our Bore Welder on the Q150

 

Picture shows horizontal welding in a hole using a cloth to shield the welding process Photo shows vertical welding in a hole

INSTRUCTIONS FOR USING OUR Q150 LINE BORE EQUIPMENT:
Clic para ver las instrucciones lineas maquinado en espaρol
ALWAYS WEAR SAFETY GLASSES ! * ALWAYS KEEP HAIR, CLOTHING, HANDS AND FINGERS CLEAR !

It helps to have a 2nd person to assist with the setup, especially when positioning your boring bar.
This is intended for reboring pivot holes in heavy equipment such as cranes, backhoes, end loaders, excavators and tractors powered by your variable speed magnetic drill with a 3/4 inch [19mm] capacity drill chuck and a long drill press stroke. Our equipment can also be used to rebore holes on machinery side frames, mounting flanges, printing press frames, steel mill ladles, bridge pivots, etc.

1) When holes get egg shaped there is usually part of the hole that is not worn out and then you can reference off of the original hole diameter. Using two holes to repair, insert one plastic alignment cone (or metal sleeve for small holes or adjustable centering tools for very worn holes) against the good side of each worn hole. The further apart the holes are, the better. If using the line-up sleeves (for small holes), you can carefully wrap tape concentrically around the outer diameter of each sleeve for snug fit between the sleeve and the hole. It sounds strange but tape works. If the holes are too worn to find any of the original diameter to position the cone against, then you should use our optional centering-measuring tool set to position the boring bar.
2) Slide the boring bar through each cone (or sleeve) and tighten the set screws in the cones. You can hold the cone & boring bar up against the good side of the hole by using the bunge cord we provide.
3) Bolt a self-aligning flange bearing to a bearing backup plate using bolts and washers.
4) Slide one bearing & plate on one end of the boring bar and the drill base adapter (with built-in bearing) onto the other end. Screw 4.5" riser blocks to bearing plates and to drill adapter base. Determine where riser blocks can be tack welded to connect bearing plates to equipment to be line-bored. The 4.5" inch riser blocks also allow easy removal of alignment cone and access for cutting tool adjustment and measuring of the hole with the digital caliper (a flashlight helps to see). The 2" inch riser blocks can also be used vertically with the 4.5" inch risers if you need to get around a boss or a hydraulic line. One of the bearing plates is extra long in case you want to overhang a bearing at the end of what you are boring.
5) The optional BOA-408-AMT Bore Welder can screw into the drill base adapter or into the extra long bearing plate (instead of using the BOA-408 tack-weld bracket).
6) Tack weld all stand-offs to heavy equipment to be line bored using many small tack welds to avoid warping.
7) Undo set screws, slide boring bar part way out and remove the cones (or sleeves) from under the bearing plates. 8) Using the shaft you can add more bearings where possible to prevent vibration during boring. We recommend one on each side of every hole you wish to bore (unless there are more than 2 holes).
9) Make sure the shaft will slide back and forth inside the bearings. This is because after welding all the standoffs in place, the bearings will be seized on the shaft and it will be necessary to loosen the bolts that hold the bearings to the mounting plates (try doing this to the inner bearings only). Then tap the boring bar slightly until you can slide the shaft back and forth because the welding process may have shifted things enough that the boring shaft does not want to slide through the bearings. The Adapter Base bearing position is permanent in order to protect your mag drill press spindle bearing. This is required by Milwaukee to avoid hurting your warranty. The Milwaukee Drill Motor has 2 mounting positions. 1 with the Drill Chuck close to the Magnetic Drill Base and 1 with the Drill Chuck farther from the base. You normally want the Drill Motor bolted in the position where the Drill Chuck is closer to the Drill Base but either should be OK.
10) Carefully position the magnetic drill in the adapter base using the jacking screw, and tighten the chuck of your magnetic drill onto the 3 flats of the shank of the boring bar while supporting the weight of the mag drill with the screws in the adapter base. It may be helpful to loosen and retighten the drill base swivel if your mag drill has it.

Be careful not to bend the boring bar when installing the magnetic drill press.
11) On the Safety Adapter Base; tighten the 4 side clamping bolts against the drill magnet base. In case of electrical power failure, such as blown fuse or bad electrical cord, this is to help prevent the magnetic drill from injuring you and bending the shaft.
12) Insert the cutting tool into boring bar. Set screw the cutter in position to proper dimension for cutting. It helps to use one of our optional Cutting Tool Positioners shown near the bottom of this webpage. Otherwise you have use the digital caliper to measure from the tip of the cutter to the back side of the boring bar (see photo). You can also adjust your cutter position with a dial indicator. Then adjust the cutter out by the amount of change you set the caliper jaw for. Then tighten the set screw in the boring bar. Do not attempt to cut more than 1/32" [.78mm] off the diameter per pass thru. Less if the hole is large or if the hole is welded.
Photo shows how you can adjust your boring cutter height with a dial caliper
13) If you are boring thru weld, spray cutting fluid/oil often. If you cant find any, WD40 will still work, but beware that cutting oils will leave an oil residue. This matters if you bore before you weld. You should remove oil residue before any welding to avoid oil hardening the weld.
14) Begin cutting at low RPMs. You should be able to remove up to 1/32" (1/64 per side) with each pass. Keep the carbide tool bits at low RPMs (100 rpm for 8" dia [200mm], 160 max rpm for 5" dia [125mm], 225 max rpm for 3.5" dia [87mm], 400 rpm max for 2" dia[50mm]). If the cutting tool is fighting hard, apply less pressure, to make the carbide cutting tools last longer. Check often to make sure the drill chuck is still tight on the shank. Vibration can loosen it. Also make sure you have a bearing located next to each hole to be rebored.
15) The cobalt steel cutters are great for removing high spots from welded holes or for finishing. The left hand brazed carbide tools are for boring. A carbide facing tool and a carbide chamfering cutter are also included. The Borite holder with the carbide triangle insert is good for boring larger holes.
ALWAYS WEAR SAFETY GLASSES ! * ALWAYS KEEP HAIR, CLOTHING, HANDS AND FINGERS CLEAR !
Do not rush. There is no substitute for using caution and common sense.

There are usually three options to repair pivot holes on heavy equipment:
16 - Method A) Holes can be welded and then bored back to the original specs. Unless you purchase a Bore Welder such as the BOA-408-AMT this is time consuming because it requires a lot of welding. Original Spec size is the hole diameter specified by the manufacturer (such as Caterpillar) to fit the pivot shaft, or if there is supposed to be a bushing, then spec size is the hole sized to press fit the bushing. Grind off or bore out galled metal first, because if you weld on top of galled metal, the weld will pull carbon from the galled metal and harden too much and you will waste many cutters and a lot of time trying to rebore the hard weld in the hole. Same advice goes for removing old grease and oil since they can oil harden the weld. Make sure you use the correct weld rod/wire for reboring with carbide cutting bits. 6011 rod is easier to machine than 7018 but wears faster. Consider 7014. For wire use 70S6 or substitute 70S2. If welding in cast steel then use a soft weld because it will harden and be hard to bore. If boring cast steel make sure to use C2 carbide instead of the C5 we give you. In welded holes it may help to first bore with the HSS cobalt steel cutter (instead of brittle carbide) to remove the high spots from hand welding. But you should use a hand grinder to grind smooth any high spots from the welds first.
16 - Method B) Holes can be bored larger than spec size, and then a sleeve can be press fit or welded into the hole so that the I.D. is the original hole size (we recommend about 1/2" diameter larger for holes 2" to 4", 3/4" diameter larger for holes 4" to 6"). This method only works if the is a lot of extra room. The advantage of this method is that when the sleeve wears out you can just replace it without reboring.
16 - Method C) An oversize bushing can be installed if there was a bushing before. Then when the holes become worn out again simply replace the bushing with a new one. An oversize bushing can be purchased from the manufacturer (such as Caterpillar) or are easily made on a metal working lathe. Heat treating the sleeve will make it last longer. Original Spec size is the original hole diameter specified by the manufacturer (such as Caterpillar) to fit the outer diameter of the pivot shaft, or if there is supposed to be a bushing, then spec size is the hole sized to press fit the outer diameter of the bushing that the shaft fits into. Check with the manufacturer for original specifications. Oversize bushings can be purchased from a heavy equipment dealer or sometimes an industrial bearing supplier such as one at the website www.ebushing.com. If your holes are not too worn and an oversize bushing is available, then you can just bore to fit the new larger outer diameter of the bushing. You can freeze some bushings overnight (or use nitrogen) and slip them into the holes in the morning for an easy press fit into a hole that is undersized by .001". Beware that the bushing I.D. does not collapse in so much that you need to bore or hone the I.D. to fit the pin.
17) Stop to measure the hole after each pass through and adjust your cutter as specified above in paragraph 12. You will likely need to sharpen or switch cutters at least once (if it did not break). Use the dial caliper with jaw extensions provided or optional dial indicator bore gage or telescoping gauge set. The optional snap gauge set or adjustable threaded measuring tools allow you to measure the bore without removing the boring bar and so does the caliper extenders. The best way to get the most exact finish is to hone the last .001 inch. A hone with 100 grit honing stones is good for this. This also reduces the risk of accidentally boring too much. Scroll down below to see this option.
18) When holes are finish sized, remove Magnetic drill and all bearings.
19) Carefully use a torch and hand grinder to remove bearing standoff plates for future use or leave them on until you are absolutely sure you are done. The screws are designed for easy re-assembly back together in the exact same positions if you tighten them down 90 percent of the way and then tighten the last 10 percent of the way a 1/4 turn per each screw until they are gradually all tight.
20) If you are careful you should use about 1 or 2 carbide cutters per hole. Welded holes are hard on carbide bits and may use more.
21) Our standard equipment can bore up to 5.5" diameter but be aware that extending the cutting tool bit out far increases unwanted vibration (tool chatter). If you get a lot of vibration then you should read our webpage How to Reduce Cutting Tool Chatter. To reduce cutter vibration in holes 3.5 to 5.5 inches [87 to 128mm] you can buy the optional slotted clamping collar set. To bore holes larger than 5 inches, use the optional oversize adapter which allows hole boring up to 8 inches. The adapter slides on the boring bar and is designed to be screwed into one of the threaded holes that normally hold a set screw and then clamped on the boring shaft by tightening the clamping screw. The cutting bit can then be used inside the adapter to bore up to 8" diameter. The optional adapter comes with 8" diameter cones and longer bearing mounting plates to bridge over 8" holes.
NOTE: The carbide tips can be modified or sharpened with a green silicon grinding wheel or diamond grinding wheel mounted on a bench/pedestal grinder. Grinding the relief angle of the carbide further back can help reduce cutting tool chatter. The colbalt steel cutters can be sharpened on any grinding wheel. All the cutting bits shipped with the line boring equipment are full length stock size, so that each tool is capable of cutting to its maximum diameter. To bore holes smaller than 3.5" diameter, cut the shank of a cutting tool bit with a hack saw. To bore holes smaller than 2", you may need to grind back some of the cutting tool head so that it can fit further down into the square tool hole on the boring shaft. Our equipment uses standard 1/2" square lathe carbide cutting tools. We provide a indexable tool holder with triangle carbide inserts, carbide boring cutters, colbalt steel boring cutters, carbide chamfering cutter, and carbide facing cutter that faces a circular path about 5/8" wide and can be used to face multiple concentric paths. You could also consider using a portable belt sander for surface facing or our optional facing-sanding disc that mounts on the boring shaft. Need to cut a retaining ring groove? Grind the tip of your cutter to match the width of the groove to cut. Mount a set screw collar on your cutter and use a spring to push outward against the collar. Push the cutter down into the boring bar while you position the cutter to where you want the groove. Tighten a bearing set screw against the boring bar to hold the position. Then release the cutter and use very slow rpms to cut the groove. This method can work for holes over 4 inches diameter. It is a very crude way to cut a retaining ring groove but it can work.
Buyers are encouraged to call our office if telephone tech support is needed.
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Click for TROUBLESHOOTING: HOW TO REDUCE CUTTING TOOL CHATTER

Click to see customer VIDEO of our Q150-S Line Boring Machine
Click to see a 2nd customer's VIDEO of our Q150-L Line Boring Equipment
Click to see a 3rd VIDEO of the Q150 Portable Line Boring Machine filmed by a customer

OPTIONS AVAILABLE for Q150 and Q175 Equipment:

Replacement Cutting Tools:

• Brazed carbide boring cutter 1/2" square: $12.
3.5" long. Just sawcut to length to fit in hole. Assume 1 per hole is needed. Can be sharpened on green silicon grinding wheel. Rake angle can also be ground steeper.

• Cobalt steel boring-finishing cutter 1/2" square: $12.
Needs sharpening often but never breaks. Good for boring high spots in weld or for finish cut. Sharpen on any grinding wheel.

• Brazed carbide Chamfering cutter 1/2" square: $12.
Chamfers a 45 degree lead-in angle on outside of hole.

• Brazed carbide Facing cutter 1/2" square: $12.
Faces a path 5/8" wide. Can face overlapping paths.

• Borite LH 1/2" holder for triangle carbide insert: $29.
Reusable by changing the triangle carbide insert.
Great for reboring holes larger than 3.5" diameter.

• Borite 3-sided triangle carbide insert PC300: $12.

Minimum order size is 10 cutters. We recommend C5 (or PC300) carbide for reboring steel plate and C2 carbide for reboring cast steel. Note: 1/2 inch = 12.5mm

Carbide Boring CutterCarbide
Cobalt Steel Boring CutterCobalt
Carbide Chamfering CutterChamfer
Carbide Facing CutterFacing
Borite Carbide Tool HolderBorite

All of the above cutters are included when you buy a complete Q150 or Q175 setup.

Optional Q88A 0.875" x 29" Boring Bar Kit for use with Q150 or Q175 equipment: $750.
For reboring small holes using the Q150 system. Works from 1" to 1.5 inch diameter for holes spaced up to 16" apart, possibly more depending how you set it up. This set includes flanged insert bushings, centering cones, 1/4 inch square carbide cutters and a cobalt steel cutter. For reboring Bobcats, snowplow hitches, etc.

Q88A add-on set to use  the Q150 to rebore holes 1 inch to 1.50 inch diameter

Optional Q100A 1.000" x 36" Boring Bar Kit for use with Q150 or Q175 equipment: $795.
For reboring small holes using the Q150 system. Works from 1.125" to 1.5 inch diameter for holes spaced up to 20" apart, possibly more depending how you set it up. This set includes flanged insert bushings, centering cones, 5/16 inch square carbide cutters and a cobalt steel cutter. To rebore Bobcats, snowplow hitches, etc.

Q88A add-on set to use  the Q150 to rebore holes 1 inch to 1.50 inch diameter

Optional Q125A 1.250" x 36" Boring Bar Kit for use with Q150 or Q175 equipment: $850.
For reboring small holes using the Q150 system. Works from 1.5" to 4 inch diameter for holes spaced up to 20" apart, possibly more depending how you set it up. This set includes flanged insert bushings, centering cones, 3/8 inch square carbide cutters and a cobalt steel cutter. Great for reboring 1.5" diameter holes.

Q88A add-on set to use  the Q150 to rebore holes 1 inch to 1.50 inch diameter

Optional 18 inch Boring Shaft:
$275. (1.500 diameter)
$295. (1.750 diameter)
This short shaft is designed for boring single holes. There is a square hole for mounting a carbide cutter close to the end for getting into blind holes. May be used for reboring holes for truck axle bearings and valve bodies. The 1.750 diameter size can be made with a threaded end to install a boring head for only $50 extra.

18 inch Shaft

Optional 8 inch Capacity Boring Adapter Kit: $695.

• Cutting Tool Adaptor Collar mounts on Q150 or Q175 shaft as shown in the lower photo to hold the cutter out far enough to rebore holes up to 8 inch diameter. The weight of the collar also means it acts a little like a fly wheel. It screws in to the same threaded hole that the set screw uses. The collar also uses a clamping screw to squeeze it on the shaft.

• Also includes 2 extra large diameter positioning cones to fit holes from 5 to 8 inches. The positioning cones have set screws in them to hold the cone in position on the shaft.

• Also includes extra long bearing mounting plates to bridge over holes up to 8 inches diameter instead of only 5.5 inches diameter. These same plates are also used with our Facing-Sanding Tool.

This Kit is included with the Q150E8 and Q175E8.

8 inch capacity boring kit

Telescoping Bore Gage Set: $49.

6 piece Telescoping Gauge Set. Measures up to 6 inch (150mm) diameter holes. Insert the spring loaded prongs into hole. Plungers expand in hole to be measured. Use the knurled end to lock the setting, then measure accross the ends with the dial caliper included with your line boring equipment. Self-centering spring-loaded action with lock, satin chrome finish. Precision-machined hardened steel anvils with spherical tips; uniform contact pressure. Comes in plastic pouch for storage. Included FREE with new Q150 & Q175 systems.

Telescoping Bore Gage Set

Optional Threaded Measuring and Centering Tool Set: $95. per set - fits thru the boring bar into the 1/2" square cutting tool ports. We include all the different lengths of threaded extensions with rounded ends you will need for holes 1.75" to 8". These tools are used to measure a hole thru the tool port in the boring bar. After gaging the hole you measure accross the threaded gauge rods with the digital caliper. These adjustable tools can also be used to position the boring bar inside a worn hole during setup. A crude but low cost alternative to the Snap Gauge Set below.

Threaded Bore Measuring Set

Optional Boring Bar mounted Snap Gauge Set to measure holes: $489.

The most accurate, reliable and easy way to measure the holes but also our most expensive. These hole size measuring gauges fit inside the boring bar into the 1/2" square cutting tool ports. These tools are used to accurately measure the bored hole without removing the boring bar. Very accurate to within .001". The gauges are spring loaded to expand inside the bore. The size is locked with a set screw using a small hex wrench. The gauge is then removed and a caliper is used to accurately measure the length of the gauge.

If you will be doing a lot of bore repair then you will want this.

Professional bore measuring Snap Gage Set

Optional Cutting Tool Positioner: $199.

Two piece gauge that offers an easy way to accurately adjust your cutter height to within .001 inch on the radius. It also holds the cutter while you tighten the set screw in the boring bar against the cutter shank. Set screws onto the cutting tool and adjusts the position up or down by .001" per line of rotation on the outer ring.

Works for adjusting the cutter height for holes 2.25" diameter and larger. Need to mount to other end of cutter for holes smaller than 2.5". For holes larger than 2.5" diameter it can be left on the cutter while boring holes. We include a hex wrench for the set screw that is inside the inner collar.

We recommend this for holes larger than 2.5" diameter.

Cutting Tool Positioner
Image shows how to adjust the Cutting Tool

Optional Adjustable Dial Indicator: $49.

If you do not already own an Adjustable Dial Indicator, then buying this option could be a no brainer. Every machine shop should have one. This option works great for accurately adjusting your cutter height within .001 inch. The magnet will attach to our mag drill adapter base, or to one of our bearing mounting plates, or to the boring shaft.

The assembly includes:

• Magnet with V-shaped base and on-off switch
• Adjustable arms with connectors and fine adjust
• Dial Indicator - accurate to .001 inch

We recommend this if you will bore small holes.

Photo shows how you can adjust the boring tool with the dial indicator

Optional Cutting Tool Dial Indicator and magnetic mounting bracket: $195.
Easy way to accurately adjust your cutter height to within .001" on the radius. Includes a Dial Indicator with .001 inch increments, a flat pusher disc and a magnetic mounting bracket with multiple threaded hole positions to screw the Indicator into. This solid mounting system eliminates the flimsy rods normally provided with a dial indicator. Our L shaped bracket uses a super powerful magnet to clip on to the bearing plate (or drill adapter base) next to boring bar. The cutter tip pushes against the disk on the tip of the indicator. Can be left in place while boring. Sets cutter height for 1.75 to 5.5" dia.

Dial Indicator for Cutter height adjustment

Optional Cutting Tool Micro-Adjuster:
$340.
(Dial type)
$442. (Digital type)

A very accurate way to adjust your cutter height. Clamps to the carbide carbide cutting tool shank and very accurately adjusts the position. Can be used on either end of the cutter. Works for setting the cutter for boring holes 2.5" diameter and larger. Extremely accurate to within less than .001". Unfortunately you have to always remove it after each use before boring.

Cutting Tool Micro Adjuster

Optional Precision Dial Indicator Bore Gage: $89.
• Measues 2.0" - 6.0 inch with 11 anvils
• Indicator is in inches
• 0.0005" Graduation indicator.
• 6 inch probe depth
• For measuring hole diameters, tapers, and roundness.
• Self centering.
• Comes with AGD Group II dial indicator.
• Fitted case with anvils index
• Accurate way to measure your holes
• Time consuming to use.

Dial indicator Bore Gauge

Optional Honing Tool: $87.
Attaches to your Mag Drill chuck or any other portable drill. 2 to 7 inch range. Comes with 220 Grit honing stones premounted for super smooth finishing work if you are a perfectionist. We also include a set of 100 Grit honing stones that are great for removing the last .001 inch without going over. We recommend this.

Honing Tool Expands to fit your bore.100 Grit honing stones included

Optional Set of 2 Slotted Clamping Collars: $119.
Reduce the vibration of your carbide cutter with this option. These 2 clamping collars can be attached at any time to reduce cutting tool chatter. They are slotted to fit around the square shank of your cutter. One on each side of the cutter but still allowing access to the set screw in the boring bar to adjust your cutter height. Each clamping collar has a set screw to clamp against the cutter shank. Great way to reduce vibration when boring holes 3.5 inches diameter or larger up to 5.5" diameter. We recommend this.

Optional Facing-Sanding Tool: $194.

Use to sand and face the damaged boss around a hole and make it like new again. The set includes an 8 inch diameter aluminum sanding disc that screws into our Q150 boring shaft and is designed to spin at 350 RPM. This kit also includes 6 adhesive coarse sanding discs for metal removal and 3 adhesive medium sanding discs for metal finishing. Discs are 8 inches diameter. You can add an 8 inch capacity bearing mounting plate if needed for only $35 extra.

Picture of Facing-Sanding Tool Kit

Optional Universal Joint for Mis-alignment: $695.

Use to compensate for misalignment of the Boring Shaft and the Magnetic Drill Press. Comes with Adapter Shaft (shown in photo) to connect the Universal Joint Coupling to your 3/4 inch Drill Press Chuck. This is not needed for most line boring jobs.

Universal Joint for misalignment

Optional Shaft Extender: $545.

This tube is specifically engineered to connect 2 line boring shafts together. This will allow you to line bore long distances. Connects the 2 shafts from the Q150XLS or Q150E to be 9 feet long. Connects the 2 shafts from the Q175XLS or Q175E to be 12 feet long. The outer diameter is 2.25 inches. The length is 36 inches. Made from high strength hydraulic tubing.

Extender to connect 2 boring shafts

Milwaukee Magnetic Drill Press with 3/4 inch chuck to fit the shank of our line boring shaft:
$1595.
if purchased with a line boring setup.
($1695. if purchased separately.)

• You will find many uses for this drill, besides boring.
• Approved by Milwaukee Tool Company engineers for use with the Q150 line boring Adapter Base.
• Uses 120 volts electricity (see below for optional $219 transformer if your country has 220 volts).
• Powerful 12.5 Amp motor
• Swivel-lock Adjustable Positioning Base
• 9 inch stroke, 11 total stroke if stops are removed
• Variable Speed controlled by a knob
• Feedback Speed Control
• Computer Controlled Reverse is variable speed
• Solid State Electronic Switching
• Full Wave Holding Power
• Superior Cutting Tool Performance
• Line Lock-Out: Prevents tool from operating should voltage be restored to an interrupted line when switch is locked in the "on" position.
• Motor/Magnet Interlock
• Base/Chip De-Mag
• Soft-Start
• Weight: 65 Lbs.
• We normally have it in stock

The Dial to adjust the RPM on the Milwaukee Magnetic Drill Press goes from 0 to 9:
0 = 0 rpm / 1 = 39 rpm / 2 = 78 rpm / 3 = 117 rpm /
4 = 156 rpm / 5 = 195 rpm / 6 = 234 rpm / 7 = 273 rpm
/ 8 = 312 rpm / 9 = 350 rpm = top speed

Milwaukee Magnetic Drill Press

Milwaukee logo

Voltage Transformer/Regulator: $219.

Fully automatic servo motor-type A.C. voltage transformer and regulator, 3000 watts. It will convert your 220-240 volts 1 phase electricity to 110-120 volts to use the Milwaukee magnetic drill press in countries where 120 volts is not available. Not to be used on American 220-240 Volts. This voltage regulator will stabilize a voltage fluctuation between 50v-130v or 160v-245v (+/- 4%). Weight 26 Lbs. (12 kg)

Voltage Transformer with regulator

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American Machine Tools Corp.
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Chicago IL 60631 USA

Phone: 773-334-5000
Fax: 773-442-0314

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