Vertical mill R-8 spindle galling repair

Hello,

I have a Wells Index 847 mill, the R-8 spindle taper has some galling in it.

What are my options on this to ream, grind or hone this taper?

Thanks, Kurt

How much runout do you have ?
How did it blue up?

Hbjj said:

How much runout do you have ?
How did it blue up?

Click to expand...

The galling in the taper was bad, i didn't make any effort made to blue it up. Didn't attempt any further measurements as to the amount of runout, bad is bad, and this was.

I found someone had made a u-tube video of their regrinding of the taper, darn helpful in my case, I've never seen this done. Afterwards, I took measurements and blued it up. Blued up nice, and couldn't believe my reading for rollout, tried two different indicators. With a 1/4" collet & pin installed, shes real steady between "0" and that first .0005 tick mark.

Super pleased with this.

Being new to it, I spent about 3 hours setting up for it, and about hour in regrinding the taper and touching back the spindle face so the collet would be flush again.

I set it up a Suhner rotary flex shaft, with the gear head to run at 14400 rpms. Ran the mill slow! I ran the bit up into the spindle by means of raising and lowering the knee, with the handpiece mounted in a vice and v-block.