Re: more thoughts on torch height

Dale,

I've got the circuit worked out; voltage in, step and direction out
with hysterisis . It takes a quad comparator (LM339), a dozen
resistors and two caps; about $1.50 in parts at Radio Shack prices.
It would be very helpful to know what voltage you want to servo to.

When I have that, I can scale the input resistors and post the
diagram.

Mariss

--- In CAD_CAM_EDM_DRO@y..., "aspaguy" <spaguy@l...> wrote:
> The following is an exerpt from a shopbot page about upgrades.
> perhaps it will be of help. They seem to be using the same z axis
for
> torch height control. I have e-mailed them for more info, but don't
> know what to expect as a non shopbot owner.
> Thanks,
>
Dale