Shopsmith Forums

You're right, that's the only Jacobs chuck that fits the specs, though it's clearly different. Practically, I could buy that chuck new for less than the rebuild kit (and half the price of SS's version), so I seem to be wasting my time.

But, looking at its specs, the runout I'm seeing appears to be ...

I've noticed wobble in my chuck, and the trouble has been narrowed down to the jaws, which appear to have gotten galled on their face so they don't hold bits true.

Thanks to YouTube, I've found several tutorials on how to do rebuilds, where the jaws and split nut can be replaced. But... which kit ...

The elevator bolt worked like a charm. Just a few seconds at a bench grinder got it close enough to do the job.


Elevator Bolt2.jpg


When tightened, the square part of the head stuck up above the table maybe 1/32", but enough that you'd need to oversize or counterbore the fixture hole to ~13/32 ...

Yeah, 30 years, but with a ton of idle time. A lot more than 10 hours use, though!

I suppose if you're doing lube every 10 hours, then oil makes sense. I'll try to report back on the dry lube.

I had this exact same problem a week ago on my 510. And yeah... I've owned it for 30 years and this is the first time I've been inside it for maintenance, so no regular PM.

Prying the sheave apart was the biggest hurdle; it was stuck so solid I could hardly tell what was supposed to move. I applied ...

Needing a solution faster than shipping allows (and lacking access to a mill at the moment), I'm trying an alternative...


Elevator Bolt.jpg


Elevator bolts can be found at your local True Value / Ace Hardware store. The 5/16-18 size costs $1 USD and has a flange that's over 1" diameter. Use a ...