Bench Grinder Mods

Introduction: Bench Grinder Mods

About: There's always a better way, just keep recycling those brainwaves!

Every engineering workshop needs a bench grinder. Whether its for sharpening tools or drill bits, its a cheap and useful tool to have in the garage.

These modifications show you how to fit:

  • A gooseneck magnetic base LED worklight
  • A variable speed controller

Both these modifications are low cost, and have served me well, so I thought I'd share with my followers.

Step 1: Wiring Diagram for Modifications

All the circuit mosifications were housed internally in the plastic base of the grinder.

I removed the speed controller pot from the board and extended by soldering 3 wires, so i could locate the knob in a convenient position, and house the controller board.

If you don't know the dangers of working with electricity, do not meddle!

Step 2: Fit a Magnetic Gooseneck LED Worklight

This magnetic base LED gooselight was originally intended for sewing machines, but works great on the bench grinder.

The strong magnetic base means you can easily relocate it to the left/ right grinding wheel, and adjust the gooseneck exactly where you need the light.

It has an in-built AC transformer and power switch, so you can operate the light independently.

Step 3: Fit a Variable Speed Controller

Low speed is desirable when sharpening drill bits, but often found on more expensive grinders.

This speed controller board gives you a variable speed controller at the twist of a knob.

Just wire up according to the circuit diagram, and twist and go!

I moved the speed knob potentiometer from off the PCB board, and rehoused it on the casing using 3 soldered extender wires.

Step 4: Use It!

You have now converted your cheap bench grinder into a deluxe bench grinder.


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    Question 4 days ago on Introduction

    in the circuit diagram the speed control really does not show which wires connedt where? thanks for your kind lesson and sharing your knowledge .... OORAH!!


    2 years ago

    Well I went ahead and purchased the speed controller and installed it on my grinder. I noticed that yours is 2000 watts and most are available with 4000 watt capability for around the same price so the 4000 watt would be the better choice.

    Now I have a problem in that my grinder has a start capacitor in it and that seems to be interfering with the proper operation of the grinder. Do you know how it can be used in this situation?

    I had heard of the magnetic sewing machine LED from "bigclivedotcom" and have 2 installed now . One on the electronics bench and one on my computer . Brilliant.


    2 years ago

    Thats a good instructable . I had not thought of slowing the wheels but that would be useful for polishing metals too. You could improve it slightly by puting links to the items also. Saves typing in to a search box.


    2 years ago

    The magnetic light is really smart :D