For annealing, wrap a water soaked towel where you want to stop the heat treatment and use an induction heater.

For turning, bore a set of soft jaws and if the turned section is longish run it with a centre.

On rolled ball screws is the exterior concentric with the lands? I was always under the assumption that you needed to indicate the screw where the ball rides.

Thanks
Derek

I have checked several rolled screws and found that the OD is definitely NOT concentric with the ball tracks. Some mfgs even state this in their specs. (IIRC)
I like the split bushing deal RICH, but I would still put it in a 4 jaw and indicate the ball races true .... just to be certain.

I also found that you can not expect the OD of the ballnut (even in a precision ground assy) to be exactly concentric.
The only true way I know of is to take the time (pita) to dial in the race ways.

Thanks,
Russ

It makes sense that the od is not concentric. Its metal that pushed up when the rollers pressed the grooves into the shaft.