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There are 2 ways to control industrial sewing machine speeds. One is to use a variable speed motor and controller. This will make your machine act like a variable speed electric drill. The other is a constant speed motor with a mechanical clutch. This would be more like a manual transmission car with the engine running at a constant speed and you control start, stop, and speed by slipping the mechanical clutch. On the sewing machine, you can change overall speed by changing belt pulley diameters. I have the mechanical clutch, and motor I'd sell at a reasonable price if your interested.
 
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