11-12-2018, 11:33 PM
That could work IF your lathe dials (or DRO) are set to measure diameter, rather than radius. Most are set up such that you need to divide the difference in your measurements by 2. If you turned your dial 0.250", you would find the round bar to be smaller than the hole.
Also, in practice, it's a good idea to sneak up on your final size by machining close to that size, then carefully measuring before closing in on the final size. When you are getting close, be sure to do several "spring passes" (re-cutting without changing your settings), to allow the 'give' in the lathe to cut what it will. Then measure and cut, taking the same number of spring passes before measuring again.
Also, in practice, it's a good idea to sneak up on your final size by machining close to that size, then carefully measuring before closing in on the final size. When you are getting close, be sure to do several "spring passes" (re-cutting without changing your settings), to allow the 'give' in the lathe to cut what it will. Then measure and cut, taking the same number of spring passes before measuring again.
Mike
If you can't get one, make one.
Hawkeye, proud to be a member of MetalworkingFun Forum since Jan 2013.
If you can't get one, make one.
Hawkeye, proud to be a member of MetalworkingFun Forum since Jan 2013.