Induction v. series... You know, motors was my weak spot in electronics
class (and that was a long time ago - a whole other story). I knew there
was something about this. Thanks....
At 03:32 5/23/2000, Randall was inspired to say:
>Problem is, routers almost always use series-wound motors (with
>brushes), while every bench grinder I've seen uses an induction motor
>(no brushes).
>
>Induction motors take an entirely different type of speed control than
>series-wound motors. You may be able to achieve a small variation in
>speed with your router control (like maybe a 20% reduction from full
>speed, with a larger reduction in power), but any attempt to slow it
>more will likely result in burning up the motor, the control, or both.
>
>Many grinders, etc. use a starting winding with a centrifugal switch,
>which I think will make it pretty much impossible to use a speed control
>without modifying the motor.
>
>Randall
>
>Richard Beels wrote:
> >
> > Anyone ever used one of those $40 RSCs that Toolcrib sells to slow down a
> > bench grinder, polisher or wet grinder instead of a router?
> >
> > It claims to "reduce speed electronically without reducing torque;
> > electronic feedback maintains speed by increasing voltage to motor as load
> > increases. Adjustable speed from 0 rpm to full speed. Full power & torque
> > at all speeds. Works with routers 3-1/4" HP or less. 120-volt,
> > 15-amp. Does not work with soft-start routers." Has a 3 position switch
> > (variable, off, full speed).
> >
> > I'm thinking that it should be fine because how does the darn thing know if
> > you're using a 1/2 HP bench grinder or a 2 HP router. Start up draw
> > shouldn't be too high to fry it, I think....
> >
> > Cheers!
Cheers!
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