Re: [CAD_CAM_EDM_DRO] Re: CNC HOT WIRE FOAM CUTTING

The foam is melted and as a result some soft gooy stuff is deposited in the
area.
becomes solid polymer glue when cooled.
counterproductive around fancy tooling.
Jesse

npalen@... wrote:

> How would it work to make a ceramic sleeve to chuck in the spindle.
> The sleeve would have, say, a 1/16" dia. "nail" dropped in from the
> top side of it prior to chucking. Heat the nail with a small torch
> and then run the cut program at very quick speeds before it cools.
> I'm talking a very small part here.
> Nelson
>
> --- In CAD_CAM_EDM_DRO@y..., ccs@m... wrote:
> >
> > > Hello all--wondering if anyone has any ideas on cutting foam with
> a
> > > stiff hot wire "chucked" in the spindle. I'm needing to make a
> few
> > > small "doughnuts" out of foam rubber less than 1/2" thick.
> >
> > Model airplane folks make new slightly longer tips for soldering
> guns
> > (the kind that have a heavy wire restiviely heated, not the
> > pencil-like irons) to cut foam details after cutting the basic shape
> > with a long thin heated wire.
> >
> > You might be able to make such as a milling tool, but would need to
> > figure out how to couple high currents to the rotating spindle.
> > (Don't do it via the bearings!) Some nifty method could probably be
> > worked out using a sort of transformer, or even winding a generator
> > armature and using the spindle to rotate it in a magnetic field.
> >
> > But I'd be more tempted to figure out how to put the work on a lathe
> > where the heated tool need not rotate. Or use a boring head in a
> > mill, but rotate the spindle by hand with some long flexible wire
> > leads. I guess if you have a CNC that can do circule interpolation
> > and manage to make a round cutter somehow the spindle need not
> rotate
> > at all. But a round tool would either need to be coaxial (in which
> > case the inside may get hotter than the outside) or complete the
> > current path via something below the work.
> >
> > Use adequate ventilation as the fumes may be very bad from some
> types
> > of foam rubber and have an appropriate extinguisher on hand in case
> > you manage to set it on fire!
> >
> > Chris
>
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