After replacing the quadrant gear, I'm trying to set the slowest speed so it's around 700 RPMs. Right now it's at 900 RPMs. (I know this accurately because I recorded a video clip at a high frame rate and counted 150 turns in 10 seconds.) Anyway, the belt on the upper sheave sticks out *past* the sheave about 1/32", and what I'm reading suggests it should be 1/16" inch *in* from the edge. There's a little more room left for the spring to compress on the lower sheave, but is it OK to crank it a little slower still? I'm attaching pictures, including one of how open the lower sheave is at my current slowest speed - I've heard it can be bad if the belt goes in too far.
Another question: at the fast speed, the set screw stops you from going past. So what exactly is stopping you at the slow end? Thanks for any help!
I just take the easy way out when doing jobs like this. I simply adjusted it so the belt is into the pulley the 1/16" recommended and use it that way. I'm not really concerned about what the actual speed might be. Everything works, and that is what matters to me. I installed a new Shopsmith belt before adjusting.
I like putting hours of use on the machine and hate tinkering on it. After all, isn't that what tools are made for?
Last edited by garys on Wed Jan 20, 2021 10:55 pm, edited 1 time in total.
The belt is I believe too long. IIRC 25.5" is correct = about 650 mm.
Also the width is too wide(15/25.4 = .590") s/b about 1/2to 9/16.
Both cause faster speeds.
The slow speed 'stop' is determined by the travel limit of the control sheave(fully closed).
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