Hi all,

We just got an assembly in here that is a little over 1.50" in diameter. It
comes in a 8-up panel, with each board having four tabs holding it into the
panel.

We built 3 panels on a quick turn for our customer, and after we built them,
the "mouse-bites" they had on the tabs didn't lend themselves to being broken
easily, and I felt it was taking too much force to singulate the boards...I
didn't want to fracture any solder joints or parts. So I got my trusty Dremel
out and singulated them (it was only 24-boards).

One peculiarity about this little board, is that the circumference on the
top, bottom, and edge is plated, and the plating must stay intact, except
where the tabs were.
After the boards are built, they are conformal coated except for the plated
area around the circumference.

The dimensional tolerance for the diameter is 1.650" +/- .005". So if there
is any proud material left at the tab area after the board is singulated, you
can imagine what a PIA it is to have to file this down to meet spec...go to:

http://www.stevezeva.homestead.com

and look at "Round Assembly" to get a better idea of what I'm dealing with.

My question is, what sort of tab configuration would you recommend that would
be able to stay within that +/- .005" dimension and not have to file things
down? Is it possible? This is a double sided SMT assembly using a .062" thick
board.

Thanks in advance!

-Steve Gregory-

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