Thread: Variable speed motor question

The sealed units may be better to reduce shock chances

There are a couple of the boxed ones with number around the dials which will help with keeping everything constant and repeatable. Will add a link later to how to build one and do other stuff like engine braking and I think he made a vfd as well.

Here is the link
Make your own Lathe from other peoples rubbish : Speed control (part 1 - general information & motor connections)

Well, good on ya Ed, I'll be watching the fun. I bought a vfd for my grinder, had to have variable speed, fwd and rev.

Had a better look at the link. He actually converted to dc for high current and low voltage to keep the torque up. Don't think I will worry as low torque suits me fine for a buffer. Got father's day and birthday next month so hopefully can get a few spindles and mops etc. With the money I save not needing an extra shaft, bearings and pulleys because of the variable speed means that I can get more. Had a look locally for switches but nothing around so this will be a long build waiting for parts and the time to get everything assembled and right.


FAL the good thing about brushed motors is you can switch direction by changing which brush you put the positive current through.

I got this thought it would be the best one. Will make a box with master switch etc so I can use it on everything in the shed

AC220V 10000W SCR Digital Voltage Regulator Speed Control Dimmer Thermostat | eBay

Just to keep in mind: washing machines and dryers typically have motors than don't have enough power to drive a belt grinder. If you start hogging blades and make the belt slow down enough, you'll burn the motor. Motors are typically less expensive than VFDs, so if you buy a VFD, you may as well buy a decent motor.

I won't be making a grinder just doing buffing atm. Did another quick 1hr motor grabbing sesh yesterday and probably have enough now to last a while.