Most of the new scroll saws have variable speed. I have an old Delta from somewhere around the 1970s. The saw works fine, and is built much better than the new ones which have a lot of plastic parts. But it has one drawback, no variable speed control.
I've seen schematics for motor speed controllers, but I already have too many projects to do. Is there any reason I can not use a regular light dimmer to control the speed? I would use a dimmer rated at 600W or greater. (The saw runs on my 300W inverter in my car, so it's not a huge power user).
I also have some old electric drills that have bad motors or stripped gears, which have variable speed switches. I suppose I could modify one of them for this use too, but since I need two hands for cutting the wood, I cant be holding a trigger switch. That's why a light dimmer seems most useful. I can just dial the speed I want and dont need to touch the dimmer unless I want to change the speed.
Plus a dimmer could just be mounted in an electrical box, with a receptacle next to it, and I can just plug the saw into that box.
But I am asking about this because I am a little concerned that the dimmer could be hard on the motor, since these dimmers are made for lighting, not motors......