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How to slow a grinding/polishing machine

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Author Topic: How to slow a grinding/polishing machine  (Read 158 times)
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« on: February 10, 2022, 10:59:22 am »

Gentlemen - I'm a newbie and have a small problem that I need some help with.  As a newbie, I bought one of those green cast iron Chinese grinding/polishing machines off of ebay.  It runs at about 2400 or 2800 RPM, and is the 6 inch model.  I need to slow this thing down.  I've been told that a normal rheostat in the power line will ruin the motor.  All I know about electric procedures is that a finger in a light bulb socket will hurt.  Can anyone help me with my grinding machine speed?  I know - get rid of it and by a machine made for this purpose with adjustable speed.  I can't afford to do that, as much as I'd like to, so I need to try and fix the problem I have.  If anyone has any suggestions I'm all eyes and ears. 

Since I'm new to this forum and unfamiliar with it's workings, Can any answers or suggestions be emailed to me at  I welcome any ideas.

Jim Holian
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