Re: [CAD_CAM_EDM_DRO] Re: tooling table ideas

lcdpublishing wrote:

>Hi Bill,
>
>I am about in the same situation, I think. I am not sure of what you
>question is though.
>
>I think you are referring to what to use for a backer board to hold the
>PCBs while milling and drilling, if that is the case, that is where I
>am at as well.
>
>As you know, when drilling, the drill bits will pass through the PCB
>into a backer board of some sort. That is generally a waste material
>of some sort - perferably something cheap and it is often called a
>spoil board.
>
>
>

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