> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of Gmail Lists
> 
> I am looking to make a sort of supply unit that puts out 
> variable frequency at 220VAC. So when I need to grind welds 
> on corners of a MS box, I run the wheel at high speeds. When 
> I need to polish SS run the buff at a much lower speed. When 
> I drill a hole in wood, the drill is run at high speed and 
> for metals at low speed... Not individual controllers for 
> each tool but a variable frequency 'power supply' rated for 
> the biggest and can be used for the smaller ones.
> 
> Mohit.

Your plan is doomed to fail. I wish that weren't true, because then I'd
have exactly that setup running in my shop right now, and there'd be
thousands of other guys doing the same thing. Then it would be easy to
find the info you're looking for, along with commercial products to make
such an arrangement easy to implement. 

One place where you can find lots of info about machine tool motor
control is at www.practicalmachinist.com. Search the RFC/VFD forum. This
discussion would be on topic in that forum. Many of the folks there are
extremely knowledgeable. Some of them are engineers who make their
livings from motor controls. Others are machine shop operators and
industrial maintenance operators. They know their stuff because they
have hands-on experience with a wide range of applications. They will
give you all the detailed technical reasons why your plan is not
practical.

This is bordering on an OT discussion, if it's not there already, so I
shall say no more. Good luck, whatever you decide to do.

Glenn Minch




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