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Full Version: Motor controller question
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So, I broke down and bought one of the HF 1x30 belt sanders.   After disassembly, cleaning, reassembly and adjusting, it's much smoother and quieter than out of the box.  Except for the included belt (which is garbage), it's not a bad little machine for under 50 bucks.  BTW, new (quality) sanding belts are available from Klingspor at very reasonable prices.

However, it has one major flaw, and that is the fact that it is single speed, and runs way too fast for my tastes.  As a result, I searched and found this: 

Which brings me to my question.  Will this thing damage the motor, provided I don't slow it down so much that it stalls the motor?  I just want to reduce the speed without spending a small fortune on a VFD.  I also don't want to burn out my new toy.

I know I could convert it with a DC motor, but would rather not go to that much expense or bother.

Advice from the more electron knowledgeable folks appreciated.
It probably has an induction motor, so no you can't slow it down. They use the line frequency to set the speed. Dropping the voltage will over heat the motor.

Your cheapest option would be to pick up an old treadmill. They can often be had quite cheaply, sometimes free. Get the type with a rotary or slide speed control. You won't like the ones that you have to tap a button repeatedly to change the speed.

The biggest challenge will be in setting up the right pulleys to get the best speed range. Treadmill motors are a LOT faster than the normal motors on the belt sanders. If you can set up the top speed to match what you have now, you can easily run it at any speed you want.
That was the plan, when I was going to build a 2x72. I've been searching for months, with nothing coming up unless I want to pay. For now, better belts means it will work for what I want.