Thread: How do you slow down an electric motor?

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Originally Posted by Itoldyouso

I agree Pat, these things are wicked. I put a hand held tach on it tonight and the tach goes to 3500 and it passed it up by 500 rpms, so I guess it runs at 4000! I did play with the belt adjustment trying to get it to track straight, but the problem is, when you first start the motor the belt goes to the left, then as the motor speeds up it goes to the right. I watched it spin, and the bottom drum tracks straight, but the top one wobbles a little. I pulled the bearings out and they seem to have some slop, so I am going to hit the bearing house and replace them.

If that doesn't do it, I am going to have the top drum trued up on a lathe, but I can't see how a steel drum would have gotten deformed. We've pretty much decided to concentrate on getting the belt portion working and forget the disc part. We already have one 12 inch disc sander that runs at a sane speed, so we will continue to use that one.

Don

the track is very touchy look at the side there a flat plate .the guy i know added another spring plate to it he did seam to think that help. some belts just do not track as well as other sanding belts. that is why mine is so thin .the best thing is to do is just bump the start button and see wich way she going and move the thum wheel the other way. them two up top just a very very small bit till you can hold the button on and have it track good .on the top drum you do not want to turn it flat. it should have some crown to it it will hold track .you cut that out it will be very hard to keep true or put some more crown in