Shopsmith Forums

Just picked up a 510 the other day. When I bought it the guy started it up and ran it up and down the speed range with no problem. Today, I went out to familierize mayself with the machine, and I ran it up and back down the speed range, but when I started to run it back up again, I felt something give way, and I lost control of the speed. Anybody have any ideas what may have happened. I'm really bummed, as I am really looking forward to spending some quality time with this machine!:(

Hi and welcome;
It sounds like the loop on the control sheave has come off the speed control quadrant. (the piece that looks a pork chop) When this happens you lose control of the speed. Look through the inspection hole on the back side of the machine and if you can, post a pic of the insides. DO NOT PUT YOUR HAND IN THE INSPECTION HOLE IF THE MACHINE IS PLUGGED IN THE OUTLET!!!
Full line voltage is on the switch terminals whenever the machine is plugged in.
Bill V

Could be the speed control knob set screw. Maybe it was loose, he turned the speed control and the knob just kept spinning. Speed stayed the same.

holsgo wrote:Could be the speed control knob set screw. Maybe it was loose, he turned the speed control and the knob just kept spinning. Speed stayed the same.

Been there done that!!

Thanks for the input guys. It was the small rectangular spring steel loop. It seems to have stretched out some. I happen to have another head stock that I had removed the motor from, so I was able to take that one off, as well as get the roll pin out of the shaft. The one from head stock one has gone AWOL. Now, what's the procedure for getting that little sucker back on there?

Hi, flyinlow! Welcome to the Forum!:) I see we both posted at the same time - BAD NEWS about replacing that loop! Once removed they just don't seem to stay put very long! Also the machine probably needs lubrication.

You have two answers that could be the problem. I hope it is just the speed control set screw that has come loose. If this is the case, the Speed Control Handle will rotate, but the lettered Speed Control Dial will not.

If the loop on the end of the control sheave has come loose, you will need a new sheave. The hollow shaft, the end bearing and the loop are part of that Control Sheave Assembly.

Look at pages B-6 and B-7 of this PDF for exploded diagram and listing of these parts.
http://www.shopsmith.com/ownersite/productmanuals/MKVSTDPartsList%20_1_14.pdf

You will also want to review at least Sawdust Sessions #21 and 22. - - http://www.shopsmithacademy.com/Sawdust_Sessions.htm

If the square loop has been 'pulled' out of the end of the control sheave, it is an indication of insufficient lubrication of the control sheave(idler shaft) and the floating sheave(motor shaft). The loop is there to prevent rotation of the center button as it rides on the quadrant arm. When the sheaves are well lubricated, the loop is never pulled. The floating sheave immediately responds to changes in belt tension by the control sheave.

Hello,

I am a newbie with an old SS that turns on but makes a grinding sound. The headstock does not glide on way tube at all. It's been sitting in garage for over 10 years. I now have time and interest to get into woodworking. Can anyone give some guidance as to where to start?

Thanks!
Beshia

This is probably the best place to start:

http://shopsmith.net/forums/showthread.htm?t=5092

Sounds like your way tubes need to be cleaned and waxed. How much cleaning depends on their condition. If rusted, they'll need to be sanded - how vigorously depends on the amount of rust.

Someone else will have to help with the motor.

beshia wrote:Hello,

I am a newbie with an old SS that turns on but makes a grinding sound. The headstock does not glide on way tube at all. It's been sitting in garage for over 10 years. I now have time and interest to get into woodworking. Can anyone give some guidance as to where to start?

Thanks!
Beshia

I would start by disconnecting the motor (remove the drive belt) and then turning it on to see if the "grinding sound" is still there.

If it is, you gotta service the motor before you run it anymore.

If the grinding sound does not come from the motor, you have a complete tear down in your future.