Evo160K Report post Posted June 9, 2014 (edited) Is a smaller sheave available to fit this speed reducer? The smaller one in the picture is about 3-1/2" OD. Note the number 60484 and the letter "M" on the sheave. The pulley bore is 5/8". This reducer is on a 8345-30 claes machine we're restoring. The guard (not shown) on the reducer has a Singer decal and the whole assembly is extremely heavy. Edited June 9, 2014 by Evo160K Quote Share this post Link to post Share on other sites
Constabulary Report post Posted June 9, 2014 What an awesome old style speed reducer!!! I like it very much!!! But sorry I can´t help. Quote Share this post Link to post Share on other sites
silverbullet Report post Posted June 10, 2014 You should be able to get a pulley with a 5/8" bore and a 2" diameter easily at a hardware store or Lawnmower shop. Quote Share this post Link to post Share on other sites
pcox Report post Posted June 11, 2014 looks to me like the 4 bolt flange locks the pulleys together. I doubt that you will find one of those that is a direct replacement. Quote Share this post Link to post Share on other sites
Evo160K Report post Posted June 11, 2014 (edited) Constabulary, Thanks for the compliment. Silverbullet, Pcox. The pulleys are locked to either side of another piece that has a 5/8" bore. The pulleys have about a 1-1/4" bore (I was wrong when I said 5/8"). Thanks all. Edited June 11, 2014 by Evo160K Quote Share this post Link to post Share on other sites
pcox Report post Posted June 11, 2014 your not going to be able to use a 2 inch pulley as the bolts are on 2 inch centers. You may be able to put a 2" on it with set screws in to the hub Quote Share this post Link to post Share on other sites
SARK9 Report post Posted June 11, 2014 That 1-1/4" bore (plus the bolt circle diameter) will severely limit the minimum size of the small pulley you could substitute, and the hight of the mount will limit the option of increasing the size of the larger pulley unless you mount it on a riser etc. That is an exceptionally cool piece of original hardware as it is....I think I would try to find a reason to use it just as it was designed, somehow. You *will* get an RPM reduction and a torque multiplication with it, and if combined with a decent servo motor, I'll bet you would find it perfectly useful. There are several commercially available speed reducer pulley sets available if you have to go that route.....but the price is so close to the cost of a mid-range servo I believe I'd go that way. -DC Quote Share this post Link to post Share on other sites
Evo160K Report post Posted June 12, 2014 Pcox, You're absolutely correct, now that I think about it. I'm going to leave it the way it is as SARK9 suggested and see how it runs once we get it back together. Quote Share this post Link to post Share on other sites
