9x20 Lathe Boring Bars

9x20 Lathe Boring Bars
Last updated on Wednesday, November 23, 2022 10:46:27 AM Mountain 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 brand 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 set screws 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 set screw marring on
the shaft. 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 bolt clamps the adapter body while the right
bolt clamps both the adapter & the boring bar shank.

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 with no wear to tooling.

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.