9x20 Lathe Boring Bars
Last updated on Sunday, February 12, 2017 07:52:45 AM Eastern US Time Zone

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Boring Bar Sets, QCTP Boring Bar Holder, Sleeve Adapters, Boring Head in Tailstock, Boring a Plastic Part, Boring Bars

Boring Bar Sets

Borite boring bar set (USA) that uses TPMM22_ carbide inserts. 1/2" ground shanks.




Carbide boring tool bit sets with precision ground 1/2", 3/4" & 3/8" shanks.

QCTP Boring Bar Holder

This quick change tool bit holder also has a V-notch to hold a round (3/8") boring bar shank.
The setscrews mar the shank making it difficult to insert into precision holders e.g., a boring head.


This AXA quick change boring bar holder holds a 3/4" shank tool.

Sleeve Adapters


This 3/8" round to 1/2" square, slit, steel adapter eliminates setscrew marring on the shaft. Shaft marring interferes
with insertion/removal when using a boring head. The hole was reamed for a close precision fit to a ground shank.



This supplied sleeve accessory adapts 3/4" to 5/8" shanks for the quick change tool post boring bar holder.


A 3" long, steel, 3/4" to 1/2" adapter. The hole was precision reamed & the single slit is 1/8" wide.



The left clamps hold the adapter body while the right clamp holds both the adapter & the boring bar shank.


For use on the 9x20 lathe.


Rigid holder & excellent boring bar performance.


A 1/2" to 3/8" boring bar adapter can be added for even smaller shanks.

 Boring Head in Tailstock

A 2" diameter boring head with an MT2 (screw-on) arbor can be used in the 9x12 lathe's tailstock.
A taper cut is setup with the material held by two dead centers & driven by a faceplate with a dog.

Boring a Plastic Part

Made a Delrin spacer for a Blizzard rifle scope lens hood. I cut the outside
dimension then quickly removed a lot of ID material using a large 1-1/2" drill bit.


Bored the inside dimension. Delrin cuts smoothly & precisely.


Cutting-off the part. 


The cover is installed on the scope with the spacer inside.

Boring Bars

Boring bar set: 3/8", (2) 1/2" , 5/8", 3/4" & 1" diameters. 3/8" holds 3/16" round tool bits; others hold various sized
square bits. Each bar holds bits either perpendicular or at a 45 deg angle. Good for inside boring & inside threading.

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Boring Bar Sets, QCTP Boring Bar Holder, Sleeve Adapters, Boring Head in Tailstock, Boring a Plastic Part, Boring Bars

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