Small Lathe Chuck Adapter Plate and Arbor

[Paul Jones]

JR,

Over the weekend I had to change-out my 6" 3-jaw chuck for my 8" 4-jaw chuck on my geared head lathe and thought it would be much easier sometimes to just use my old 5" 4-jaw from my mini lathe and add new arbor for holding in the 6" 3-jaw chuck. I looked at this posting to see how you did the arbor when I notice your 3-jaw chuck with the arbor has four adjustment screws (I think you already posted the adjustment screw modification on HMT). I like the convience of chucking a smaller 4-jaw chuck in the 3-jaw chuck.

Question: Since you have the four adjustment screws, I wondered why you couldn't adjust the 3-jaw chuck TIR to be better than 0.002" and mark the arbor with a witness mark for holding it the same way each time in the 6-jaw chuck?

Paul