Can anyone tell me the minimum turned dimension?
I have two (2) OEM finned drums that are in great shape, but need turned.
ID run-out is @0.020". My buddy has a drum lathe, but I need a min. dimension.
Can anyone help?
Thanks.

9.500 is standard size. The maximum size for a turned drum is 9.590. Anything over that, throw um away.

Thanks for the info!