Re: Materials for test, foam?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Peter" <muchopedro@...> wrote:

>
> I have been a member for a bit, and have learned a lot from the
> archived messages. I have my 30"yx40"xx4"z cnc gantry functioning
> well in wood--but I am looking for something I can cut to test paterns
> (topographical models) before committing to an hours long, multi tool
> cut that might not come out perfect. I seem to recal there being some
> sort of dense beige foam--I am thinking that I could cut this at a
> higher speed as a test. Does anyone have any suggestions as a
> material? --this is probably just on the edge of being off topic, so
> if you can suggest another place to ask the question it would be most
> welcome.
> Thanks,
>
> Peter,
>

I use polyurethane foam blocks for making models ( plugs ) for
fibreglass moulds. These would be ideal for doing test runs on a CNC
gantry. They are available from most fibreglass materials suppliers up
to around 200mm thick, but can be expensive. Most of these materials
are greatly affected by static electricity created by the friction
from rubbing or sanding, so a vacuum / extraction unit should be used
or the dust will stick to everything.
Regards,
Glen.