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Originally Posted by jerrymayfield You need to be very careful when using a ( rheostat) speed controller for most hand held tools. The motors in most ,if not all, of these tools are universal motors (actually dc series motors).When you lower the speed you lower the torque,when this happens the current goes up and with it the temperture. They can overheat rapidly. This is not the same kind that maybe used with an ac motor to either vary the frequency or to chop off part of the voltage wave.
regards
jerry |
I guess I should have made it clear that we are talking an electronic speed controller for a router. The fact is a rheostat if you could find one to handle the current would be very large and most likly a lot of $$$.
You can think of what I'm talking about as taking the speed controller out of a router and putting it in a small box.
I should also point out this is for routers that use brushes are not soft start and use less then some set number of amps.... in my case 15A. The ones I have see are for 60cycle 115V standard type power here in the US. They have a three position switch (full, off, variable) as well as speed dial. Normal they are current protected with a fuse of some sort.
Ed