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From: | |
Date: | Fri, 22 Nov 96 13:25:34 PST |
Content-Type: | text/plain |
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Dear synergists:
The peripheral area of a laminated
printed circuit board experiences the
most scaling problems. Yet this is the
area of the panel that is x-rayed in
order to measure for xy drill offset.
Xray data suggests our current scaling
error is not predictable.
Also, our shop sees that the measured
offset, especially in Y, usually results
in an overcompensating shift in the
drill offset.
Has anyone else seen a Y offset
measurement problem?
More importantly, how is data from the
peripheral area justifiable?
Best regards
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