What does your contract stipulate? One board for the whole of the contract?
If I were the customer that would give me some greef. If I were your
customer I would like to see lot sampling as a minimum, not the same board
rerun over and over. After all, the name of the game is "cleanliness
testing" ie. how well are your cleaning and handling processes working.
Ron Dieselberg
Trainer/Auditor
CMC ELECTRONICS
CINCINNATI
[log in to unmask]
-----Original Message-----
From: Lou Hart [mailto:[log in to unmask]]
Sent: Monday, April 30, 2001 13:35 PM
To: [log in to unmask]
Subject: [TN] Process control for cleaning
TechNetters, I'm following up on a discussion we had some months back,
regarding use of an Omegameter at the end of a cleaning operation for SPC.
Our production manager asked if we could use a single, standard board, run
it through the solder wave and cleaner, then test it in the omegameter,
doing this at prescribed time intervals for SPC. Let me make sure I'm
clear: this standard board would be one unit, that would be used
repeatedly to check the cleaning operation. Using the single, standard
board would eliminate variablity from handling, board and material
composition, and all the things that affect the omegameter reading. The
only variables (we speculate) would be in the solder wave and the cleaner,
the latter of which we are wanting to control.
What, if anything, is wrong with this idea?
My understanding is that incompletely cured laminate can release ionic
material. Could there be any such problem with solder resist?
Lou Hart
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