Re: [CAD_CAM_EDM_DRO] Double sided milling WAS Re: SuperCam & PCB Trace Milling Software

> Howdy! How 'bout a couple of through holes in the board to be used as
> locators. When the board is flipped over, use these 2 holes as "witness
> marks". Since you know their coordinates, you should be able to line up
> the board's coordinate system so the 2 sides are aligned.
>

I use this method frequently for machining large mold plates. The
registration is excellent if you use a very small drill (#50 or so) and go
through the sheet into the fixture about .25 inch. When it's time to flip
the part, just push the shanks of two said small drills throught the part
and into the holes in the fixture. It's probably good for about +/- .002 if
you are careful. Just don't forget to deburr everything first.

Doug