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Double Sided Fixture For PCB Milling. It’ll Flip You. Flip You For Real.
Remember? When the cops got Benicio del Toro and he was saying that Stephen Baldwin was going to flip them? No? Anyway…
Having purchased 100 of the same size copper clad FR4 boards, the extra effort was made to machine a proper aluminum fixture for them. 6061 Al is surprisingly cheap at mcmaster-carr. The purpose of said fixture is to hold the board flat on all 4 sides, force distributed over multiple points per side, with an open center area for drilling. References to locate X and Y are integrated into the fixture, Y along the top edge, and X by protruding ‘nubs’ underneath the side clamps. Enough freedom along the X axis is allowed in order to be able to slide the board to the other sides reference after flipping, so the board is always located on the same side, at the same point. Flatness and squareness are critical.
Highlights includes endmills doing circles around broken taps and the taig covered in aluminum chips like it was snow.
Posted by rmrubin 
December 2007