Thanks (to all) for all the inputs!

The slots between boards are to eliminate the twisting from the
hand-separation.  The SMT parts are in the middle of each board, with
only the connectors on the ends.  I am considering an alternative
arrangement ( see the picture at
http://www.cipher.com/Panelization03c.jpg )  that has extra tabs along
the middle V-Score line to stiffen the assembly.

The customer has requested that the boards be delivered in panels for
de-panelizing at the final processing step.  My hope is to minimize
break-apart stresses at the middle of the board with clever
strain-relief slots.

The real proof of my efforts will be monitoring the results at the end
of the final testing.


Two more questions to the group:
1.  Do I need to worry about solder flowing up (through the slots) as
the board travels through the wave ( moving in the direction of the long
axis)?
2.  Is 18"x24" a typical processing panel size?  (I can make my array
fit with minimal waste if I know what actual panel size will be used)

Thanks,
Carl

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Tuesday, January 04, 2011 11:07 AM
To: [log in to unmask]
Subject: Re: [TN] Looking for guidance on specifying panel of small PC
boards

Hand (manual) singulation might be okay for prototypes, but not in
production.

Anyway, I think your routes look like they are about six inches long,
and may hang on the conveyor if the strips (two boards lengthwise) warp
or bow. Why couldn't those be v-scores as well?

Also, can you remove the yellow rails, or are there components too close
to those board edges? If so, fabrication might not complain as much
(they like to have an inch all around for their own purposes, and if you
are fabricating 18x24 panels,you should try for about 8x10 pallet size
to get 4-up. That's what I've always been
told...) two less rails to remove, anyway. 

hope that helps,
Jack

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