(Disclaimer: I looked, but if this is a FAQ that I missed, please let me know )
I am trying to use a Samtec ERM8 edge mount connector in a design. This connector is keyed on the board side and requires a notch in the board’s edge to correctly seat.
I’ve tried edge cuts in footprint (yeah, I know), edge cuts on the board, and all I ever end up with is this:
I’ve gone through the edge cuts in the board, “traced” the outline of this notch (by opening the board outline to make a gap and then using lines and arc to form the notch), checked that all edge cuts are snapped together correctly and not leaving gaps. Yet, I don’t get a notch.
What is the correct way to do this? Pointers, well-placed whacks to the head, all welcome.
It looks like the footprint has an edge with a notch already existing in the Edge.Cuts layer. These Edge.Cuts are an open shape. The 3D viewer has problems resolving open shapes.
A) Save an edited version of the component with nothing in the edge cuts layer and make the cut in your board yourself. [J1 in image] Probably the preferred method.
B) Save an edited version of the component with a closed shape for the Edge.Cuts and use that. This will cause a problem if that cutout overlaps with your board edge. Also, if you place it too far from the edge you will get a hole rather than a notch. [J2 in image] This could cause problems in manufacturing so many not be a good idea.
You need to think about manufacturability. Inward cuts with square corners is a no-go (unless you want to pay extra for laser-cutting).
The PCB manufacturer cuts the PCBs with mill cutters in vertical spindles, and cutters are… round.
If you strictly need to fit in a rectangular piece to your PCB, use “Mickey Mouse Ears” instead.