Shopsmith Forums

IIWM, because of the magnitude of damage, I'd replace the whole control sheave either new from SS or used. The SS assembly is complete with button bearing, the roll pin, the loop, and 'spring.' But if you want to try replacing just the bearing and loop assembly I recall the Jacob A videos on this are pretty good. You can disassemble your old one and inspect for damage that might make it impractical to rebuild before deciding how to proceed. https://jacobshopsmithrepair.com/pages/ ... ful-videos In particular, see the ones on Control Sheave Inspection and Control Sheave Bearing. I didn't review these, so I'm just hoping I gave you the right ones. But they offer some detail on damage that would be beyond normal repair as well as the installation process. I didn't check to see if he has bearings in stock.

- David

IIWM, I would replace the quadrant and the control sheave.

I would also replace the roll pin that the quadrant pivots on with a 3/16" shoulder bolt.

The small spring is the 'anti-rattle' spring that presses against the interior(back) side of the speed indicator ring.

JPG wrote: Fri Jul 30, 2021 11:48 pm
I would also replace the roll pin that the quadrant pivots on with a 3/16" shoulder bolt.

Expanding on JPG’s suggestion, below is a link to an instruction Bill Mayo wrote up on his improvement to the speed control, which appears to strengthen a weak link in the speed control design.

Bill's instruction is the fourth PDF on Everett's post: Shopsmith Large Format Drawings, Illustrations and more.


Edit: I'm sorry, I forgot to include the link to Bill's instruction in the first iteration of this post, so I went looking for where I found it and decided to include the original topic/post rather than add the document again here.

"here is" ????

It's 'here' where he is.

Great suggestion though, if you're in there anyway might as well replace that with a bolt.

JPG wrote: Sat Jul 31, 2021 9:28 am "here is" ????

Yes, the document was in my hand as I was writing that post. I must have fallen asleep as I was typing. Sorry about that. I have updated my post above so it now includes the location where I found it. Everett's topic is very helpful, so pointing to that as a vital source helps me to remember to keep going back to those "pinned" topics.

Thanks guys.

Thanks everyone for all of your help. I have ordered the replacement parts so hopefully it will be up and running again next week. You guys were very helpful. Not sure I would have had the confidence to have done this without your help!!!

Regarding the Bill Mayo speed control mod - Bill recommended a #10-32 X 2-1/2 bolt cut to size. Is the shoulder length standardized? In other words if I order such bolts from supplier X am I going to get the shoulder length I want to serve as a hinge pin?

When I did this mod on my shorty last year the holes in the legs were VERY worn and oversized, presumably due to being reamed by the roll pin. The quadrant was worn but salvageable, the legs were straight but the quadrant wobbled in there. I ended up using a 1/4 - 20 bolt and threaded one of the legs. I'm so far happy with the results but will never have the quantities that Bill did this on. And it is way more trouble, but I really like the idea of threading one leg hole. It was already too worn for a #12 bolt. Drilling the other leg was no problem. I was a little worried about drilling the pork chop straight but I did it in small size increments and it worked fine. IIRC installation was kind of marginal due to the head on the bolt. It works fine but a year isn't much of a test.

- David