- Joined
- Feb 17, 2013
- Messages
- 4,407
I have QCTPs on both of my lathes - an AXA on the 9x20 and a BXA on the 12x24. I have a question about the boring bar holders. On the AXA set, the thru hole diameter is 3/4" and the included sleeve has a 5/8" diameter hole. On the BXA, the holder has a 1" hole and the sleeve a 3/4" hole.
I'd like to be able to use smaller boring bars in both, and was wondering what's the best way to design additional sleeves. The ones that came with the holders are both C-shaped, with a small gap in the circle to allow clamping. But in the case of the 1"-to-3/4" sleeve, that's some pretty stout steel, and I really need to reef down on the clamping screws to get a reliable hold on a 3/4" boring bar.
I can see making 1/16" wall sleeves using the C-shape design. But what if I want to go smaller? Should I split the sleeve completely in two or three places, or else cut all the way through in one place and nearly through (ie, weaker "hinge" section at 180* or 120*) in one or more additional places?
What do YOU do?
Thanks!
I'd like to be able to use smaller boring bars in both, and was wondering what's the best way to design additional sleeves. The ones that came with the holders are both C-shaped, with a small gap in the circle to allow clamping. But in the case of the 1"-to-3/4" sleeve, that's some pretty stout steel, and I really need to reef down on the clamping screws to get a reliable hold on a 3/4" boring bar.
I can see making 1/16" wall sleeves using the C-shape design. But what if I want to go smaller? Should I split the sleeve completely in two or three places, or else cut all the way through in one place and nearly through (ie, weaker "hinge" section at 180* or 120*) in one or more additional places?
What do YOU do?
Thanks!