Will a speed control work - Router Forums
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post #1 of 17 (permalink) Old 03-03-2019, 10:28 AM Thread Starter
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Default 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 question...do you think it would be safe to run the grinder with this speed controller, or would it burn out the motor windings?

As always, THANKS for the help. I wish everyone a good day.
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post #2 of 17 (permalink) Old 03-03-2019, 10:39 AM
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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.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #3 of 17 (permalink) Old 03-03-2019, 11:36 AM
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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.
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post #4 of 17 (permalink) Old 03-03-2019, 11:43 AM
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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.

Last edited by DaninVan; 03-03-2019 at 11:54 AM. Reason: Typo
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post #5 of 17 (permalink) Old 03-03-2019, 11:52 AM
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They're referred to as "line shafts". My memory just kicked in...
https://www.practicalmachinist.com/v...t-shop-286770/
Just a simplified version would do.
https://en.wikipedia.org/wiki/Line_shaft
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post #6 of 17 (permalink) Old 03-03-2019, 11:59 AM
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post #7 of 17 (permalink) Old 03-03-2019, 01:34 PM
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Quote:
Originally Posted by DaninVan View Post
Those make good tool sharpening stations too.
I do'nt think they are variable speed tho.
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post #8 of 17 (permalink) Old 03-03-2019, 03:54 PM
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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 motor...like a drill press setup
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post #9 of 17 (permalink) Old 03-03-2019, 05:07 PM
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Build you one you can use. here is a motor or find something similiar.

https://www.grainger.com/category/mo...&filters=attrs
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post #10 of 17 (permalink) Old 03-04-2019, 08:14 AM
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Quote:
Originally Posted by mjadams61 View Post
Build you one you can use. here is a motor or find something similiar.

https://www.grainger.com/category/mo...&filters=attrs
Thanks for this, Marlin. I've been wondering if something like this was available.
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