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External Speed Control on Bench Grinder

This is a discussion on External Speed Control on Bench Grinder within the Tools and Woodworking forums, part of the General Woodworking category; I have wanted to buy a bech top grinder and most do not come with ...


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Old 08-16-2009, 09:03 AM   #1 (permalink)
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Default External Speed Control on Bench Grinder
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I have wanted to buy a bech top grinder and most do not come with a speed control on them so I was thinking why not add an external speed control?

You can buy some for a router is it possible to adapt this to a bench mount grinder?

Has anyone tried this before and had any success?

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Old 08-16-2009, 12:08 PM   #2 (permalink)
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Quote:
Originally Posted by TRN_Diesel View Post
I have wanted to buy a bech top grinder and most do not come with a speed control on them so I was thinking why not add an external speed control?

You can buy some for a router is it possible to adapt this to a bench mount grinder?

Has anyone tried this before and had any success?
Good idea, I will give it a try later today.
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Old 08-16-2009, 12:36 PM   #3 (permalink)
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All grinding wheels have a maximum speed, generally based upon the diameter of the wheel.Slower speed equals cooler grinding. But it takes an instant longer. A slower speed is handy if you change grinding wheels for other rotary devices. All the fixed base grinders that I have used have been single speed.
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Old 08-16-2009, 01:37 PM   #4 (permalink)
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Hi Dan

I have and the router control device works but it comes down to what type the motor is...and amps.
Router control device 15 and 20 amp. types.. can be had.
The one I tried was a 15 amp.type..

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I have wanted to buy a bech top grinder and most do not come with a speed control on them so I was thinking why not add an external speed control?

You can buy some for a router is it possible to adapt this to a bench mount grinder?

Has anyone tried this before and had any success?
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Old 08-16-2009, 02:37 PM   #5 (permalink)
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Thans Jig I assume then if the device (speed adjuster) is rated for 15 or amps you can use it as long as the motor on the grinder does not draw anymore than the rated device.

I will have to experiment and maybe even try a dimmer switch for a light and see if that works.
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Old 08-16-2009, 04:56 PM   #6 (permalink)
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Hi Dan

20 amp speed control below

MLCS router speed control and Foot Switches

The dimmer switch will not work,you will cook in about 2 mins. or so or less .. ,I know you will say they say that it's rated at 15 amps. but it can't take on....it's a very light duty pot..or slider..

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Originally Posted by TRN_Diesel View Post
Thans Jig I assume then if the device (speed adjuster) is rated for 15 or amps you can use it as long as the motor on the grinder does not draw anymore than the rated device.

I will have to experiment and maybe even try a dimmer switch for a light and see if that works.
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Old 08-16-2009, 06:31 PM   #7 (permalink)
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Quote:
Originally Posted by TRN_Diesel View Post
Thans Jig I assume then if the device (speed adjuster) is rated for 15 or amps you can use it as long as the motor on the grinder does not draw anymore than the rated device.

I will have to experiment and maybe even try a dimmer switch for a light and see if that works.
Hi Dan:

Forget the lamp dimmer switch! As BobJ has said, they won't last. Reason is that the lamp dimmer switches are made for low inductive loads, preferably a resistive load (incandescent lamps.) Motors are high inductive loads, by nature. Current flow in a high inductive load lags the voltage by a significant amount. The lag is something we in electrical engineering call phase angle.

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Old 08-16-2009, 10:53 PM   #8 (permalink)
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Ok thanks I learned something today.
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Old 08-16-2009, 11:21 PM   #9 (permalink)
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Well after reading and learning thanks to the peopl eon this forum I have come to the realization that it may just be easier to buy a grinder with a variable speed built right into the unit.

The grinders I have looked at are about $60.00 and then you add the variable speed unit and it is over $100 plus shipping.

So Sears has one for $100 with built in speed control :

CRAFTSMAN®/MD 6" 2.8-amp Variable-speed Bench Grinder : Sears Canada

Thanks for all your help it is very much appreciated.
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Old 08-16-2009, 11:37 PM   #10 (permalink)
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Router motors and most bench grinder motors are significantly different. The commercially available speed control for routers will not AFAIK work on a bench grinder.
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