Robert Shimko
Plastic
- Joined
- Jan 22, 2020
I recently acquired a 1939 South Bend 9" workshop lathe (415YA) and need to know if the spindle needs some work. This lathe appears to have been used little, and not at all for the past 30 years.
My question is how much spindle runout is acceptable? I first put my dial indicator on a piece of 1/4" drill blank in my small three jawed chuck and got several thousandths runout (about .004/.005).
Then, because I had my indicator clamped to the tool holder, I locked down my saddle and the runout went down to about .0015".
So I put on the smaller three jawed chuck and had similar runout. Finally I put a 1/4 collet in the spindle and used the collet draw wheel and had the same amount of runout (.0015")
So I ask the collective group, Is this acceptable runout, or should I rebuild the spindle?
Thanks for any help. Pictures attached.
My question is how much spindle runout is acceptable? I first put my dial indicator on a piece of 1/4" drill blank in my small three jawed chuck and got several thousandths runout (about .004/.005).
Then, because I had my indicator clamped to the tool holder, I locked down my saddle and the runout went down to about .0015".
So I put on the smaller three jawed chuck and had similar runout. Finally I put a 1/4 collet in the spindle and used the collet draw wheel and had the same amount of runout (.0015")
So I ask the collective group, Is this acceptable runout, or should I rebuild the spindle?
Thanks for any help. Pictures attached.