JACOBEIS wrote
I purchased a Shop Smith belt for the 510
after I hooked it all up (before I put the Head Stock back on the rails)
with the Top Sheaves opened all the way (Slowest speed)
Important: opened all the way is fastest speed. And it can open too far if out of adjustment, allowing the belt to run on the portion of the sheaves that is not "V" shaped and not intended for the belt.
In order to get the belt to be right tension I closed the top Sheaves Just a little
I turned the Sanding disk just to see if the belt would moved up on the Top Sheave
It did NOT (as I turned the Speed Controller)
I Set it back to Slow & turned on the Motor
it spun very slowly I started to turn the speed controller very slowly
it went a little faster BUT IT STARTED TO SMELL AND PEICES OF THE RUBBER BELT WAS SHREADING
and then it tripped the circuit
These symptoms are consistent with the top sheaves opening too far or the belt being too narrow, allowing it to get too deep into the sheaves on that non- "V" portion. There may be other causes, but that is the one that comes to mind.
The top Sheaves are smooth and inter lock OK
all is oiled with 3 in 1 oil
Do the Top Sheaves have to be replaced???
If so what is wrong with them??
Minimum belt width for the Mark is 1/2". We can work around it some if slightly narrower, but this is the rule. There is an adjustable mechanical stop that limits how far apart the upper sheaves can be, called the high speed stop. I'm thinking yours is allowing the sheaves to get too far apart, allowing the belt to ride too deep in the sheaves. Because that portion is not "V" shaped the belt will not move farther up when you adjust the controller. Instead the sheaves will pinch the belt. Another possibility is that the floating sheave is not moving in response.
Fastest speed if belt is correct and stop is correctly set: Motor belt should be about 1/8" in from the outer edges of the motor sheaves when you reach the high speed mechanical limit. If the belt is out farther than that it is too deep in the idler sheaves. While these conditions are present the speed dial should be on Fast. (But don't worry about correcting the dial right now.)
- David