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July 2013

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Subject:
From:
Larry Dzaugis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Larry Dzaugis <[log in to unmask]>
Date:
Tue, 9 Jul 2013 19:59:53 -0500
Content-Type:
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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.


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