| T O P I C R E V I E W |
| TommyC |
Posted - Feb 01 2011 : 4:44:48 PM
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.
Any help is appreciated.  |
| 3 L A T E S T R E P L I E S (Newest First) |
| Aaron Cake |
Posted - Feb 21 2011 : 10:01:12 AM
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. |
| Pantaz |
Posted - Feb 20 2011 : 04:47:53 AM
I have one of these from HF. (Wait for a sale, when they usually go for about half-price.) It's rated for 15 amps.
I've used it successfully on an old single-speed drill, but it doesn't work on my HF 8" bench grinder. |
| Aaron Cake |
Posted - Feb 04 2011 : 09:55:45 AM
Most of those grinders are bruhsed motors, so a regular light dimmer will do the job. |
