Re: foam cutting current ?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dennis Schmitz"
<denschmitz@...> wrote:

>
> I was thinking to put power on the clips and use a heavy enough

gauge copper

> to make the resistance much less than the resistance wire.
>
> The control circuit would pump current through the wire and monitor the
> voltage drop. Divide to get the resistance, which tracks

temperature. If the

> temperature drops as you feed material, the controller would

compensate with

> more power.
>

That sounds feasable as long as you are cutting something of constant
width so you can get your clips next to the material.

I'd just go with the TLAR approach at least to begin with and start to
think technical only if you find you need to. The cnc aspect removes
most of the problems associated with manual (non gravity assist)
cutting such as non constant feedrate and snagging formers. A CNC
wire cutter has been on my list for as long as I have been interested
in CNC, one day.

Graham