Bob,

We have panelized several boards for ease of processing.  We first added
a 1/2 inch v-score border around each individual board that contains the
necessary alignment holes for our semi-automatic through hole pick and
place machine. This added three benefits.  1) the alignment holes are
never filled with a component lead.
2) we can hold the board by the edges and stuff parts right out to the
edge.
3) we can hold the board in the wave solder without fixtures and still
have components right out to the edges of the board.
An added side benefit was that with multiple boards (up to 10 per panel,
assuming the total number of boards did not exceed our machine holding
and processing capability) in a panel we could reduce our machine build
time.

Depending on how deep the v-score was made will be a factor in how
flimsy the panel will be during processing.

For v-scoring info check out http://www.accusystemscorp.com/ and click
on "V-Scoring Service" and look for their FAQ page.  It gives all the
gory details for v-scoring.

Phil Nutting
Manufacturing Engineer
Kaiser Systems, Inc.

-----Original Message-----
From: bbarr [mailto:[log in to unmask]]
Sent: Wednesday, August 15, 2001 1:46 PM
To: [log in to unmask]
Subject: [TN] Panelized Boards


I have a 3.5" x 5.5", .063" thick board we will be building in somewhat
high
quantities (3,000+/month). This size board is just on the edge as far as
having to put it into a basket to run through our in-line aqueous
cleaner to
keep it from moving around. I do not want the operators to have to put
this
many boards in baskets during production runs. So, my thoughts have
turned
to panelizing these boards, perhaps in a 2x2 arrangement. This would go
through the cleaner with no problem. I do not have a lot of experience
in
the best designs for panels. What are the advantages/disadvantages
between
v-score and tabs? If using tabs, how many are required to maintain the
rigidity of the panel during reflow? Does there have to be a border
around
the boards? Are fiducials required on the panel in addition to the
fiducials
already on the individual boards? Any other issues I may have missed?

Thanks.


Bob

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