rke[pler
Diamond
- Joined
- Feb 19, 2002
- Location
- Peralta, NM USA
I'm making a new body for an existing collet chuck, a Pratt Burnerd LC-15. I never was able to find a chuck with a D1-3 back and finally found a really good deal on one with a different back. So I'm making a D1-3 back. Yeah, I don't really *have* to have it but it's shiny and all that...
The original is pretty hard, I'd guess about 50-55RC (I didn't break out the hardness checker, a file skates nicely). The fit between parts is very close (almost interference) and the original is ground. I believe I can toolpost grind the 2 inside diameters that need to be close.
I need to decide on the material to be used. It's a pretty hefty chunk for me - 5"x5" for a finished 4.5"x5" with a 2.2" hole through. I'm thinking of maybe using 4140PH, I know it won't be as hard but I'm not going to use the chuck in any industrial capacity in my home shop. I might rough turn, harden (I have some HT facilities available) and finish grind.
Thoughts?
The original is pretty hard, I'd guess about 50-55RC (I didn't break out the hardness checker, a file skates nicely). The fit between parts is very close (almost interference) and the original is ground. I believe I can toolpost grind the 2 inside diameters that need to be close.
I need to decide on the material to be used. It's a pretty hefty chunk for me - 5"x5" for a finished 4.5"x5" with a 2.2" hole through. I'm thinking of maybe using 4140PH, I know it won't be as hard but I'm not going to use the chuck in any industrial capacity in my home shop. I might rough turn, harden (I have some HT facilities available) and finish grind.
Thoughts?