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Old 12-13-2018, 08:51 PM
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Lu47Dan Lu47Dan is offline
Connoisseur of Old Iron
Join Date: Mar 2006
Location: N/W Pa.
Posts: 6,000

Originally Posted by terry lingle View Post
The hidden issue with chuck sizing is interference as you open the jaws. it is machine dependent.
I have that issue with one of my lathes where a 10 inch chuck will open wider than a 12 inch. a larger chuck is not automatically a better fit to a lathe.
Some things to consider are weight, opening clearance, how far out from the spindle bearing you are and clearance over the cross slide.
Terry, I have thought of making circes to match the size of the various chucks I am looking at. I would use them to check clearances.
As to stick out from the front bearing, if I read the drawings correctly, the 4 jaw's weight is closer to the bearing than my current 3 jaws weight is.
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