Is there a consensus of opinion re: Bison lathe chucks?

[cazclocker]

one more thought.......

Could the four bolts be pulling it off centre?
Can you measure run-out on a precision pin in the chuck with and without those four bolts?
Since the chuck is threaded onto the arbor that should be safe right?

Brian

Hey Brian, that's an interesting idea. But hold on... the runout issues I've had come from the 3-jaw chuck (I might not have made that clear! Yikes! IF so, I profusely apologize...). My 4-jaw chuck is the one with the adapter screwed down to the back of it.

 

[cazclocker]

You also need to measure the radial runout. You could use the indicator on the perimeter side of the arbor and ignore the flat spots. If the 4 jaw threads onto the arbor, what is the point of having the 4 screws at all?

I'm not really sure what the point was in screwing down the arbor to my 4-jaw... it's been so long I can't remember the discussions I had with my friend who made it! I kept all the emails, though, so I can research it...