Grinding the Jaws

[thehomeengineer]

I think this is a new chuck that could have been adjusted on the back plate. I have seen this so many times when a new chuck is fitted to a lathe that it doesn’t run true The chuck needs to have a bit of adjustment on the back plate or you will never get a new chuck to run true. A friend only a month back bought a new chuck for a Myford lathe and explained it was no good. I removed the chuck from the backplate re machined the back plate used a test bar and clocked the new chuck true to lathe axis. Unfortunately the chuck in the video will never be true as the reverse jaws will also run out and the jaws ground will not be able to hold anything internally as these will not be true to the lathes centre line either. Very expensive mistake I am afraid.
The Home Engineer