JF, Technetters, we're in the process of setting up a new machine (selected
with the help of TechNet input).  First step is to develop a mathematical
model for coating thickness as a function of machine parameters.  After
than we plan on using microscope slides, as suggested by one of the
operators, for process control monitoring.  The thickness gage will be a
micrometer.  We're going to develop a relationship between wet and dry film
thickness, but the wet film gage we have only resolves to 25 microns.  In
the development of the model, we're also looking to find machine settings
that will minimize thickness variation across the board.  Contact me on- or
off-line in a couple of weeks if you want to know how we're coming along.
 May have results early next week.

Regarding the question of whether the aluminum plates were coated at the
same time as your material, I would ask, if your company has doubts that
the samples are authentic, why are you doing business with that supplier?

Lou Hart

-----Original Message-----
From:   Bissonnette, Jean-Francois [SMTP:[log in to unmask]]
Sent:   Thursday, March 14, 2002 5:03 PM
To:     [log in to unmask]
Subject:        Re: [TN] Coating thickness

We thought of that and it seems one very logical thing to do.  The only
problem is that
the boards are coated at our supplier's plant.  And you know how QA persons
are...
how can we prove that the aluminum part was coated at the same time then
the
batch
etc...

We have to monitor our supplier and got solid evidences.

Thank you all!  If any other idea has not been through yet don't
hesitate...
I'm all ears...
or all EYES!

JF

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