Thread Repair of a stripped out Master Jaw

[RobinHood]

Yes, the TPG came with an adapter that takes standard 1/8” shank mounted stones. It gives great versatility when it comes to selecting cutting tools/stones.

Here are the types of stones I can use. L to R: regular 3/8” bore grinding wheels directly mounted on the spindle; 1/4” bore stones with the adapter/extension; and the 1/8” mounted stones with the 1/8” collet adapter.

The spindle is capable of 36600 rpm, so even the little 1/4” stones work well.

 

[Mcgyver]

impressive, I would have been very leering of threading the hardened jaws, but your got it done!

 

[RobinHood]

I was hesitant as well. When you see Pratt’s prices for accessories, a set of MJs would have set us back $1K+, assuming you can find one. So I had to try it at least, as it was not safely usable.

Option ”B” would have been to weld up the hole and re-thread it to 3/4”-10 in the hope that the weld fill is not as hard as the jaw. Heat distortion becomes a big factor with welding.

 

[Mcgyver]

When I saw thread I thought grind and loctite in a sleeve (at 3000 psi on steel should be more than enough)...but its moot as you challenged the machining gods and won!

 

[RobinHood]

Yes, I was lucky with this repair.