Jeff:
It matters not to us what size the "dots" are for a via
plugger artwork. They will be adjusted in size by the CAM
department. I guess what would be easiest for the designer
would be to keep them the same size as the via pad. The via
plugging that we do is performed after the solder level
operation from one side (typically the solder side). An
overlap is created between the plugger dots and the LPI mask
surrounding the via hole which is large enough to accomadate
any misregistration.
Regards,
Tom Coyle
Field Services Engineer
HADCO Corporation
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