A resistive type of voltage reducer (rheostat) is the wrong thing to buy
because it will not only reduce the speed of the router but the power too. A
speed controller that is designed for controlling the speed of routers and
other brush type motors sends full voltage to the motor to maintain full
power, but it does so in short pulses that vary in width as the speed
setting is changed. These controllers will allow you to set a lower speed,
but still have the power that you need. The knob is usually marked 0-100
meaning % of full speed. This is more than close enough to get the speed
that you need for running panel raising bits. These controllers work great
from about 25% to 100% but are significantly less effective at controlling
speed between 0% and about 25%.

--
Charley


wrote in message
...
I'm thinking of getting an aftermarket variable speed thing for an
older bosch 3 1/4 horse router [1611]. do they work well? do they go
from zero? do you guess the rpm by sound? I'm doing this so i can
safely run panel bits in a table. any info will help...thanks.

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