SPEED CONTROL FOR BENCH GRINDER

Not sure but

Dustmaker Mike

>you are up earily(-; I work east coast time on the west coast so I start my day at 3 AM PCT.

Re: SPEED CONTROL FOR BENCH GRINDER

Ernie Miller Topeka

>I don't know the just of it but no the moter must have brushes like on a router or a small tool for it ot work right

Re: SPEED CONTROL FOR BENCH GRINDER

John Lucas

>It will not work. It will damage your grinder motor.

No...

Dan Donaldson

>That is the short answer. Those controllers are designed for universal motors (read have brushes and howl like banshees;-)). Bench grinders are universal motors that have their spped controlled by the line frequency and the number of poles in the motor. The only way to control them is with a VFD to vary the frequency. I am not any kind of an expert on VFD's, so I am not sure about their use with single phase motors.

Re: SPEED CONTROL FOR BENCH GRINDER

William R. Duffield, on the Cohansey

>You might try asking on the Turning Forum. Some of the guys over there use them on their lathes. They are very expensive. You would probably be better off price-wise doing it mechanically with an auxiliary shaft, belts, pulleys and pillow blocks, etc.

One point;-)

Dan Donaldson

>On the turning forum there are a lot of people that use spped controls on lathes, but they are not the router type of speed controls, which is what he was asking about ;-)

Re: One point;-)

William R. Duffield, on the Cohansey

>You're right I defer to your prior answer. I have this tendency to bleep over the word "router".

NO! A router speed control will fail the "smoke test" for sure.

Re: SPEED CONTROL FOR BENCH GRINDER

Pat Riley in Salt Lake

>A router speed control will not work.

There are several common ways to control the speed of a generic induction motor like the ones used in grinders.

1. change the frequency as mentioned before.

2. chop the input waveform. This actually works pretty good. The downside is you increase electomagnetic slip (lose torque), and become less efficient (generating more heat) - both of which lower the overall lifespan of the motor.

Re: SPEED CONTROL FOR BENCH GRINDER

Ed Gutgesell

>Most router speed controls have a fuse for protection. IMHO, hooking up the router speed control to a bench grinder will certainly vaporize that fuse.

Delta makes one for ya

Dustmaker Mike

>Delta has a 6" and 8" VS grinder you can get at Lowes.

Re: SPEED CONTROL FOR BENCH GRINDER

Moses Yoder in White Pigeon, MI

>I usually just crank slower or faster, depending on my need; not sure where I would plug in a router speed control, but could probably try clamping it underneath the base and see if it works.

I just turn the crank the speed I want.

Roger Nixon

>