The mouse bite with punch can have very low strain measurements, well under
500 microstrain.
It is suitable for high volume.
Custom dies are used for this application.
The type used placed the parts in a nest and the drawer was closed to
activate the separation.
Few problems.
2 caveats:
   1. No overhanging components in mouse bite area. They must be over a
routed area.
    2. Keep the blades sharp. The glass fibers dull the blades. They must
be replaced or sharpened. The only process that does not dull a blade is a
pizza cutter. It works by forcing the 2 sides apart.

Recommend that straingauge measurements be made of any design and process
to qualify. Variation in PCB thickness, structure and tooling will cause
variation.

Review PCB layers to keep copper free the areas of separation with the
tolerances required for the method. Scoring uses a great deal of
real-estate between the max PCB edge and closest copper. It goes up with
the thickness.


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________