Re: foam cutting current ?

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

>
> The coefficient of resistance wire isn't as linear as platinum but it's
> stable. You can design the current regulator to maintain a set

temperature

> once you've calibrated it.
>
> Come to think of it, this will be an average over the length of the

wire, so

> if it's not all being used in cutting the foam, the temp wouldn't be
> inaccurate. So if you string the wire on a tension mount with

insulators,

> then bring the current in with copper wire and clips. Then you put the
> length of the resistance wire doing the cut in the controller, or the
> controller could measure it if it was cold. Should get an even

temperature

> across the wire that way.
>
> Just thinking out loud...
>

If I follow, one could put some sensing leads with alagator clips, and
'store' them on the ends of the wire. for many cuts, measuring that
would be good enough, then on the heavy cuts, one can move them to
the edges of the part....

or, would one put the power on the clips ?

or, does it really matter ?