Question about Craftsman 16" Variable Speed Scroll Saw

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I have aacquired an old Delta scroll saw (40-530), which is a single-speed model. I am wondering whether it is feasible to convert the machine to variable-speed, by fitting some form of microcontroller. It has an induction motor, 230V (I am in New Zealand),50hz, 65W,0.685A, single phase. Any advice or suggestions would be greatly appreciated. Peter

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  • peter386 Aug 25, 2010

    Silverdragon, thanks very much for your comments and suggestions. They have given me great encouragement! Actually, I had already looked at Jaycar, but couldn't find any speed control kits. However, I now have other options. Thanks again. Peter

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Hey fellow NZer, Yup, that's indeed possible, almost ANY motor can be speed controlled, if it's NOT too big, one can simply use a 100/150 Watt Light Dimmer, (the bigger the better) to do so, bigger motors will require a proper speed controller... PWM one...
One can get kits for speed controllers from Jaycar, or **** Smith too, Radio Spares if you have a dollar to spare, they seem to charge like wounded bulls, but their stuff is always available and always works.
I doubt if you would need a microcontroller, as the load is only 65Watts, as it's current draw is under an Amp.
I imagine that the Light Dimmer will suffice... Usually though you need to upgrade the heatsink on the Triac, in any event, by about double, just to be safe.

Posted on Aug 24, 2010

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