We use an x-ray machine with the capability of measuring fiducial
locations on each layer. This data is used to determine the artwork
scaling. For the most part, standard scaling can be used but there
are particular designs/stack-ups which require custom scaling.
On 22 Dec 2004 at 13:35, Pete menuez wrote:
Frank:
I know of board shops that swear by the Perfect Test system.
These tend to
be larger companies that have the resources to throw at it. Some
consideration:
-You have to give up some real estate on the panel to place the
coupon.
-You will be adding on a fair amount of drill hits
-You will have to read and analyse the data
-You will have to put this back into CAM to adjust scaling.
This should all be a closed loop system
One company I heard of in the Northeast (No longer in business)
had
registration dialed in for every layup; including panel size, core
thickness
and even the prepreg used against the core.
I think most companies, if they add this coupon to the panel,
program the
coupon seprately so they can turn off the coupon when the panel is
in
production. (after testing)l
There are a number of these systems available through used
equipment
dealers.
Good Luck,
pete
>From: Franklin D Asbell <[log in to unmask]>
>Reply-To: TechNet E-Mail Forum <[log in to unmask]>,
Franklin D
>Asbell <[log in to unmask]>
>To: [log in to unmask]
>Subject: [TN] PerfectTest registration control system
>Date: Tue, 21 Dec 2004 12:14:10 -0600
>
>Is anyone out there familiar with the PerfectTest registration control
>system? If so how would yo rate it?
>
>As we evolve into tighter space/trace features including annular
ring,
>vias, bga etc etc we are looking for better controls for registration
and I
>found the system identified above, was wondering what other
shops are using
>for process control, testing or inspection of registration, other
control
>methods, materials, etc etc etc...
>
>Thanks,
>
>
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>Franklin
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-- Thanks,
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South Bay Circuits
(480) 940-3125 x122
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