Hi Bob,
Thank you for the detailed explanation.
You talk about a "quick-check hole diameter validation area"
my question is can you rely on these at incoming inspection?
Or should a sample check be done on a number of boards?
Thanks!
JF
BTW: Thanks to everyone for your answers, that's a lot of
help!
> -----Original Message-----
> From: Robert Lazzara [mailto:[log in to unmask]]
> Sent: Wednesday, January 10, 2001 1:50 PM
> To: [log in to unmask]
> Subject: Re: [TN] PWB hole size verification
>
>
> 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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