4 Jaw Chuck

[jpfabricator]

Measure the thickness of jaws themselves also. I had to dial in and bore a sprocket that somesome one tried to bore with a hole saw. I had nothing to refrence off of except the back side of the jaws themselves.
Mine naturally were diffrent, so I had to mark the diffrence with a Sharpe and compensate at the DI.
I was fortunate that the sprocket was a division of 4, and I was able to catch 2 teeth with each jaw.

Sent from somwhere in east Texas by Jake!

 

[Bob Korves]

You can use the rings machined into the face of the chuck for setting the jaws by eye quite closely. That is what they are for. Just see what feature on a jaw sort of lines up with a ring and make the opposite jaw show the same picture. You can get it within .005-.010" pretty quick and easy that way.