Derek Andrews wrote:
Kevin Cleary wrote:

Does anybody have a good method for finishing off the bottoms of bowls.


No one so far has mentioned vacuum chucking which is another option to
consider, though it is expensive and I have yet to bite the bullet

If you want to reverse turn, the technique you use depends on the rim
design. For example, a bowl with a natural edge cannot be held with
anything that grips around the rim. A bowl with an in-turning rim
generally cannot be held in a standard cole jaw. I have made special
grippers for one of my popular bowl designs, but it's a lot of work for
a one-off.

try some of these google searches:

doughnut chuck

longworth chuck

vacuum chuck

cole jaws

Derek, Why can't you hold a bowl with an in-turning rim on cole jaws? I
place the grips on the inside of the rim and it works fine. I can't
tighten it to much on thin walled bowls, but it doesn't have to be to
tight just to finish the bottom.