In a message dated 1/10/01 1:17:38 PM Eastern Standard Time,
[log in to unmask] writes:

<< What is the method used for verifying that the hole sizes of the production
 board have the required size??? >>

Jean-Francois,

Pin gages are simple to use, have excellent tolerancing and are solid-state
stable. Pin gages do require a bit of technique, however, as the operator can
influence a "fit" in marginal situations (pass me the hammer).

Pins may also inadvertently remove burrs and other diameter-influencing
protrusions that might not be displaced by component leads, possibly giving a
better-than-deserved indication.

Pin gauging should sample the PCB from both high and low circuit density
areas, as the rate of electroplating deposit (and subsequent hole diameter)
will vary.

If your boards are received in an array or pallet, you might consider having
the fabricator drill a series of holes, 1-each of the applied sizes, in a
sequence of descending order in the assembly rails. This can be subsequently
used as a quick-check hole diameter validation area.

Bob Lazzara
Circuit Connect, Inc.

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