Re: [CAD_CAM_EDM_DRO] Chopper frequency

Greg, Fred,

Great! Just curious about the hot wire cutting. That stuff can be used
for sand casting (or maybe it's investment casting?), too? Saw LIVE
sand casting of aluminum (a steam engine valve box) at the P.R.I.M.E.
show. I'd read about it before, but never actually seen it. I think I
learned a few things (as usual).

Alan

>Fred wrote:
>Alan there is 4 axis wire EDM hidden in Vector(X-Y-U-V style) which at
>least one Vector user is using for programming hot wire cutting of
>plastic foam, as well as a DDE server and large editor that will be
>available with the new version 8.1

Greg Nuspel wrote:

>
> Alan,
>
> The unit uses a hot wire for the cutting. It's like an EDM but simpler. I have a few programs for airfoil design but mostly I use airfoils designed by the experts.
> ----- Original Message -----
> From: Alan Marconett KM6VV
> To: CAD_CAM_EDM_DRO@egroups.com
> Sent: Thursday, October 05, 2000 11:30 AM
> Subject: Re: [CAD_CAM_EDM_DRO] Chopper frequency
>
> Greg,
>
> So I take it you are doing 4-axis wire EDM? and you use a pair of Z
> axis motors to get the tapers? Sounds like interesting stuff. What do
> you use to design the airfoils?
>
> Alan
>
> Greg Nuspel wrote:
> >
> > I have set the frequency at 32KHz since this is one of the outputs I have
> > from the 4040 chip where my clock is hooked up to. The chips gets warm to
> > the touch when there is a long no movement time. For heatsinks I have all
> > the chips tied to an aluminum plate with a Pentium II heatsink and fan
> > mounted on it. The software automatically disables the chips when the
> > airfoil is finished cutting, since there is no tool pressure with a hot wire
> > cutting machine. Only with large tapers is there any considerable time where
> > an axises does not move. I may cut the chopper frequency down to 16Khz to
> > save some heating of the chips. This will be slightly audible but I'm
> > getting older so not for long.
> >
> > -- Greg Nuspel
> >
> > "It's kind of fun to do the impossible."
> > - Walt Disney (1901-1966)