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On 8/29/2023 11:17 AM, DJ Delorie wrote:
> DerbyDad03 <
teamarrows@eznet.net> writes:
>> I`m looking for recommendations for a speed controller. Are the
>> $20-ish models good enough or should I be spending more?
>
> The cheap model has worked for me for ages, but they`re not very good at
> regulating speed once you`ve turned it down. The 690 is a universal
> motor; you can feed it pretty much anything and it will turn as fast as
> power allows. The $20 models just reduce power, so reduce speed. They
> do *not* increase torque so you`ll have to use multiple passes to
> compensate.
>
> I don`t know of any speed controllers that can regulate the speed of a
> universal motor, but I haven`t looked for any either. IMHO the design
> of universal motors limits (or removes) any speed feedback, like BLDC or
> AC motors provide. Perhaps monitoring average current can do something.
Most any router with a universal motor and a speed control will
compensate for added load. My Makita and Milwaukee both do this. All
bets are off with separate speed controllers.
>
> A better choice, of course, is a shaper that is designed to be geared
> down for larger bits - then you get slower speed with *more* torque, not
> less.
>
> Heck, for $20 this shouldn`t be a question. It`s a cheap tool, buy it
> for entertainment purposes, and if it happens to work, bonus! :-)
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