Electromagnetic Brake

Sidewinder · Jan 11, 2014

If it's electromagnetic, there will be zero slip so there is no need for friction material really.

I really suspect that it is potting compound.

Perhaps you need to establish how it works to see if it is a clutch brake etc.

I would not put a soft start, if you change it put an inverter on it, you can do the braking with that and put a pot on it & get full infinitely variable speeds.

apprentice87 · Jan 11, 2014

Hi All, I was thinking an inverter, but i could not work out how to do it safely. At the moment the spindle is electrically controlled by two contactors, a forward and a reverse. Now, i know that you are not allowed to have any switching after the inverter as you will break it.. So how do i make sure that an inverter fault does not make the thing start up?? I could live without stopping the thing to measure a part, and then have it set off with a mind of its own. I know i could put a contactor before the inverter, but then every time i turned that off it would be start again time.

I would like an inverter, as when you are cutting imperial threads you have to reverse the thing [metric leadscrew]. I was hoping that it might be possible to program an inverter so that every time i hit reverse the lathe ran at say twice the speed...

Sure, i could just use single pole contactors instead of the ones i got to operate the inverter, but then it would hardly be safe.. I think some inverters have a feature called "safe torque off" to stop enexpected restarts under fault conditions. Can they be programmed to do this every time i stop the spindle???

john...