Re: [CAD_CAM_EDM_DRO] Small Problem

From: "Alan Marconett KM6VV" <KM6VV@...>

>
> The RF mills (I have an RF-31) are gonna take bigger motors! About 450
> oz/in, from what I remember people saying. Others can probably advise
> on the motors for the plasma cutter. How big is it?

Ahhhh, I was hoping you wouldn't say that! (:>)
The plasma cutter isn't gonna be that big really.
(I'm outta space~!)
I figure it should hold a 2'x4' piece of sheet metal,
*MAYBE* 4'x4' at the *most*.
And of course, it only has to be able to move the torch head.

> Rigotti's driver board has UCN5804B's (UNIPOLAR), and is suitable for
> the 60 oz/in motors. So I'm not sure where you were going to use it.
> Your two applications call for some bigger motors!

Really? (:<)
I thought I would be able to get away with using 60's on the plasma table.
You think the 125's would be okay?

> An you really them
> to be BIPOLAR, with chopper drivers. Otherwise You'd need terrible big
> L/R resistors, and you'd have a LOT of heat to get rid of!

Ahh, kewl, thanks.

> > ... driving unipolar motors with bipolar drivers...
>
> Depends on which Unipolar motors you are talking about! A lot are 6 or
> 8 wire, and with these, you just use 1/2 of each winding phase. You DO
> NOT want anything "common" between the two windings. It will let the
> magic smoke out of the drivers!

So much to learn...

> Good luck man!

Thanks~! I'll get there...

Weyland