Re: [CAD_CAM_EDM_DRO] Re: tooling table ideas

In a message dated 10/27/2006 1:03:21 P.M. Eastern Daylight Time,
elson@... writes:

The pros use something calld backstop material and entry material.
These are
both mostly hollow honeycomb-type stuff with aluminum foil on one or both
sides. The idea is the keep the drill bit from distorting the copper
foil as it
enters and exits the PCB. I have used .010" aluminum roof flashing as
an entry
material with good results. I have used scrap one-sided PCB material as a
backstop.

Jon



This would work well if you were only drilling thru the PCB. However, if
you are actually routing the material for the traces, you aren't cutting all
the way through the material so what you use for the table would be different.
I agree that when you start to drill the holes you do need a backer and also
need a cover material or entry material.

Randy


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