Re: contact probes

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "guzakaka" <nonna01@...> wrote:

>
> Hi Graham,
>
> Not linear but circular. I tried cutting fast but I found the
> circular cuts were not round. I tried pre-drilling and then
> taking .010" cuts, but at 22,000 rpm I still had plastic sticking to
> the bit. It is delrin btw. I slowed the feed down to as low as 10 ipm
> with the small cuts but still no good. Yesterday I tried some glass
> filled nylon and that was disaster! I have some phenolic impregnated
> wood laminate that I may try.
>
> Mike

Try to evacuate the chips as agressivly as possible. an air hose on
the cutter will both cool and remove chips. for plastics, it is
important to get them out of the way. if the come in to get cut a
second time, they often wipe along the surface before shearing. that
wiping action heats things up and the chips melt. very messy.

Dave