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Re: Router Speed Control

To: shop-talk@autox.team.net
Subject: Re: Router Speed Control
From: Richard Beels <beels@technologist.com>
Date: Tue, 23 May 2000 13:24:33 -0400
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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