I plan to purchase a die grinder and want to use in a low-rpm mode. I would prefer to purchase a variable-speed, low-range grinder but the one I really like (Makita GD0810C), 1800 - 7000 rpm, is no longer available.
So I'll end up getting one of the conventional tools that run up to a no-load speed of 20,000 rpm. I need to step this down with (preferably) a simple variable power supply w/ a "rheostat" control on it.
Does anyone know where I can find one "ready to go"? Some devices I've seen advertised spec out as so many #937; and such-and-such power (e.g., 500W). The tool I have in mind is 4.3 load amps (500W).
To be clear, I'm imagining something I simply plug into and that has a rotary control on it. A suggestion and weblink to a vendor would be excellent.
Something like that only works with brushed motors. Bench grinders are induction motors. The only way to control the speed of an induction motor is to actually change the frequency of the AC.
Need 110VAC variable power supply for a power tool
Posted - Feb 01 2011 : 4:44:48 PM
