D1-4 Backplate Not Seating Against Spindle

Biasing the jaws to grip on the nose first is not a bad thing. The jaws/chuck will deflect a bit when tightened. It looks like your jaws might be correct as they are. I would see how they grip before I started grinding. The opposite condition, bell mouth, is not good, and then they would need grinding to correct. That is the case on my 4-jaw, bell mouth. I'm going to have to correct that one day.
 
Any ideas for how to test the grip? teeth marks on copper water pipe? wood dowel? aluminum tube? or ?
 
Hmmmm....Good question, I've never actually done it. Maybe a piece of about 1 inch steel bar stock. Maybe a piece of paper between the stock and the jaw. That should allow you to see the marks from the jaws. Maybe another way would be to use Plastigage (available at most auto parts stores). That would give you the actual measurement.

http://www.plastigaugeusa.com/
 
Thanks for the ideas, yall. I will tinker with it some more and report back. It might be next weekend before I get a chance.
I hope yall had a nice Thanksgiving!
 
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