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Potowner1 03-03-2019 10:28 AM

Will a speed control work
Hi everyone. A friend has given me an inexpensive grinder motor and wheels, that he was planning on using as a boat anchor. I have several sanding mops that I use mostly for scroll saw work and to do this, I have to change them out on my drill press. The grinder motor spins way to fast to use for some of the delicate parts that come off a scroll saw, so I was thinking about buying one of the speed controllers for a router that are available. Finally, the you think it would be safe to run the grinder with this speed controller, or would it burn out the motor windings? :help:

As always, THANKS for the help. I wish everyone a good day.

Cherryville Chuck 03-03-2019 10:39 AM

Speed controllers only work on universal type motors. I believe that if the motor has a starting circuit that kicks out once the motor is up to speed it won't work. It may depend on how old it is so more info and maybe a picture or two might be necessary.

Herb Stoops 03-03-2019 11:36 AM

All the bench grinders I have seen are induction motors, which like Chuck said do not work with speed controllers.
The only way you might use it is to use step pulleys and a belt and a separate grinder stand, which is a lot of fussing around. Another idea is to get an old drill motor and build a stand to hold it. Then use the speed controller and chuck up the sanding attachments.

DaninVan 03-03-2019 11:43 AM

Rick; another approach might be to use the motor with a small pulley to drive a shaft (large pulley) on pillow blocks, with your buffing wheels on that. Remember the shoemakers used to have that arrangement in their work area? Several different 'tools' on a long shaft? Somebody here might have a better description. As an afterthought, I think lapidary hobbyists do the same thing.

DaninVan 03-03-2019 11:52 AM

They're referred to as "line shafts". My memory just kicked in...
Just a simplified version would do.

DaninVan 03-03-2019 11:59 AM


Herb Stoops 03-03-2019 01:34 PM


Originally Posted by DaninVan (Post 2002401)

Those make good tool sharpening stations too.
I do'nt think they are variable speed tho.

DaninVan 03-03-2019 03:54 PM

Yeh, but I couldn't resist ...that is one pretty piece of equipment, Herb!
You could accomplish the same thing with the line shaft and stepped pulleys off the salvaged a drill press setup

mjadams61 03-03-2019 05:07 PM

Build you one you can use. here is a motor or find something similiar.

chessnut2 03-04-2019 08:14 AM


Originally Posted by mjadams61 (Post 2002499)
Build you one you can use. here is a motor or find something similiar.

Thanks for this, Marlin. I've been wondering if something like this was available.

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