I have this saw and the speed control board has gone bad,so i am going to try and use a variable ac or dc power supply to run the saw,but i am not sure which one the motor uses. I have already hooked the motor to a battery charger,it ran find but does not have enough torque for the blade to cut wood.
its not ac saw, a contractor will not use a dc motor,that is why its running slow.also check the nameplate on it it should say 120 volts ac rpm and amps.60 hertz.
If it ran off a battery it's DC. You need a reostat, like one for a ceiling fan, you can find anywhere, check for 15 amps. Next you need a diode bridge. An electrical place can help you. If you are handy you can search the internet for plans for a full wave bridge rectifier. You can build one from parts at Radio Shack or an electronics store. Your battery charger isn't putting out enough voltage, try a 24 volt charger.
I can't imagine a contractor grade Craftsman 20 scroll saw running on DC. It doesn't make sense. If this thing has a normal two or three wire cord plug then it's certainly 110 Volt AC current. I don't think Craftsman ever made a scroll saw that ran on DC.
It is ac. If you understand how motors work, you would see that dc will turn ac motors, but it wont run it effectivly.
