Im At The Fork In The Road

[NCjeeper]

Instead of grinding, you might try a big ole carbide boring bar.

Probably try this first.

 

[NCjeeper]

Need more information.
Do you just need a plain back chuck? If so there not that expensive, unless you need super accuracy.

Its a D1-4 mount.

 

[NCjeeper]

Is the old chuck adjustable or have 2 piece jaws?

Nope neither.

 

[NCjeeper]

Well as I stared at it the light bulb in my head came on and I think I may have discovered the issue. Its a D1-4 mount and it looks as if one of the studs is a tad bit taller. Im guessing there is a thread timing issue with that one stud. I didn't have time to pull some measurements the wife wanted to go shopping. I will play with it tomorrow and post some photos.

 

[middle.road]

Make up a jig like this to cut/grind them. It puts the force in the correct position.
http://lathe.com/tips/chuck-jaw.htm

 

[David VanNorman]

I think I would go for the new chuck.

 

[Jimsehr]

Another thing you could try is to make your chuck a set true type. All that is needed is to drill and tap the outside of chuck over the turned
flange of the backplate in 4 places and turn the flange OD down about ten thousands. You may also have to open the bolt holes up a bit. So the
chuck has a little room to move .
jimsehr

 

[Charles Spencer]

"When you come to a fork in the road, take it."

RIP Yogi Berra, 1925 - 2015

 

[Ulma Doctor]

if you are interested,
here's how i did it on a Atlas/Craftsman TH42 1036.
it worked well!

 

[ChipsAlloy!]

I suggest you protect the rest of your lathe against abrasive dusts if you go the grinding/dremel way. Dont own a lathe yet but machines are allergic to this.
Clean up once done!