Re: CNC Plasma

<snip>

> Depending also on what your cutting, you could run the Z axis fixed

or via step motor. Electric Selenoid or Air Cylinder options work too
as long as you build a pretty straight machine that the

> torch does not have to change much to follow the metal
>
> . I've been wondering if anyone ever made that circuit that Mariss

developed for height control. That is something I wouldn't mind
sticking on mine as I think my Hypertherm has the "output" signal

> necessary to use it.
>
> I also opted to fork over the extra cash for the real "Machine

Torch Head".... If anything it sure looks better than the hand torch
clamped >kiddiewumpass< on the Z axis.

>

< snip>


It seems that any torch should be able to use the auto height
control. A simple op-amp used as a comparitor to keep the current in
a set proportional band style control would be easy to implement.
any current measurement, feed back or feed forward, from most any
part of the torch, from the wall to the tip should offer a place to
monitor current used.

(notice generous use of 'seems' and 'should')


Dave