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Slow your single speed angle grinder down for $20 #1295272 Fri Jan 18 2019 01:50 PM
Joined: Jan 2018
Posts: 163
4
4100 Fire Truck Offline OP
Shop Shark
I bought what used to be called a router speed controller for less than $20 online. They sell the same one at harbor freight too, but was out of stock. It works really well to slow down my 4 1/2 inch angle grinder. I don't need it running wide open unless I'm trying to grind off a lot, or cutting. Slowing down my sanding discs makes them easier to handle for finishing, plus they last longer, with less heat, and a whole lot quieter. I've been using my Milwaukee variable speed grinder which is much bulkier, and this speed controller works great on my smaller, light angle grinder. Wire wheels last years, instead of days when slowed down a bit. I actually bought the speed controller to slow down the air flow on my Hobbyair 2 fresh-air respirator. It blows way too much air, noisy, and makes the air warm. I can now slow it down, and use it hooked up to my welding helmet with the hose strapped to the chin area blowing fresh air in at a gentle breeze if I want. The speed controller can be used on most "universal" corded motors that use brushes. Not for use on an induction motor like on your drill press.

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Last edited by 4100 Fire Truck; Fri Jan 18 2019 01:57 PM.
Re: Slow your single speed angle grinder down for $20 [Re: 4100 Fire Truck] #1295283 Fri Jan 18 2019 02:54 PM
Joined: Aug 2001
Posts: 3,821
2-Ton Offline
Shop Shark
Sounds like a great tool tip.
https://www.amazon.com/Yescom-Varia...&hvtargid=pla-351845451838&psc=1
I have several grinders that I would like to have more than an on/off choice.

Thanks
Don


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'48 3/4-ton grain truck
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'54 Pontiac Straight Eight
'70 American LaFrance pumper fire truck.
Re: Slow your single speed angle grinder down for $20 [Re: 4100 Fire Truck] #1295313 Fri Jan 18 2019 06:15 PM
Joined: Jan 2018
Posts: 163
4
4100 Fire Truck Offline OP
Shop Shark
I didn't know until just now, they have single-phase variable frequency drives(VFD) on the market for induction motors. That would be slick on a drill press, or buffer, etc.
https://www.ato.com/single-phase-vfd

Re: Slow your single speed angle grinder down for $20 [Re: 4100 Fire Truck] #1298296 Sun Feb 10 2019 04:05 AM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
I use the same type of speed controller on my 1/4" capacity electric die grinder, which also serves as a light-duty tool post grinder for my lathe. It's sort of like a Dremel tool on steroids and it uses 1/4" shank grinding wheels and carbide burrs. It's a lot more versatile than the air die grinders I've had back when I was doing a lot of porting and polishing of race engine cylinder heads. Some of the speed controllers are more efficient than others. In general, "You get what you pay for!"
Jerry


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Re: Slow your single speed angle grinder down for $20 [Re: 4100 Fire Truck] #1309771 Mon May 06 2019 02:05 AM
Joined: Jun 2010
Posts: 248
B
bztguy Offline
Shop Shark
I made one years ago using a rheostat. Analog dial type light dimmer. I installed it in a receptacle box, male end of a drop cord fed into to it, female end out. I've been using it for years to control the speed of my dremel, 4 1/2 grinder, buffer/polisher.....etc.....


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1975 W-25 Hurst Olds
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Re: Slow your single speed angle grinder down for $20 [Re: 4100 Fire Truck] #1324713 Tue Sep 03 2019 05:39 PM
Joined: Oct 2018
Posts: 116
D
Detroit Iron Offline
Shop Shark
Clever idea! I imagine that the rheostat from an oven might also accomplish the task. I'll look into that, and post the results in this Forum (if it actually works smile ).

Thanks for the tip!

Chris


'64 Chev C20 LWB stepside ( Ol'Blue )
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