In a message dated 1/11/01 1:22:51 PM Eastern Standard Time,
[log in to unmask] writes:

<< my question is can you rely on these at incoming inspection?
 Or should a sample check be done on a number of boards? >>

Nothing beats sampling the actual holes within the board.

However (always however)...

Pin gauging can be time and labor-intensive. Pin gauging, improperly done,
can also damage the plated barrels of holes. Thus a row of representative
holes in the assembly rail, sequenced in size, is good for quickly
identifying and accessing specific hole sizes without risk to functional
holes. If you find a marginal "fit" in any sample hole, then go internally to
the board to determine whether functional holes are also affected.

If you receive your PWBs singularly, without assembly rails, then of course
you have no other alternative than to sample directly from the boards.

Bob Lazzara
Circuit Connect, Inc.

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