Fellow techNetters,

    In the above IPC I did not see a correlation table of drill bit size to
nominal external supported annular ring.
Is there such a TABLE available anywhere.   I do not have easy access to
design guidelines/ground rules.
I did review IPC-2221 section 9.1.2.

By the way I concluded that SUPPORTED meant PLATED and UNSUPPORTED meant
UNPLANTED.   Was
this a good assumption.

Victor,

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