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Subject:	FAB -Reply
From:	Dan Lorinser <[log in to unmask]>
Date:	Fri, 17 Jan 1997 10:37:59 -0600
Content-Type:	text/plain
Parts/Attachments:	text/plain (47 lines)

Try drilling relief holes on the "tang" as in IPC-SM-782 rev A Figure 3-31.
If you have the room this works just fine and you won't incure any more
costs.
Dan Lorinser
BFGoodrich Aerospace
[log in to unmask]

>>> Ron Oneal <[log in to unmask]> Jan 16, 1997  10:00 pm >>>
We design a number of circuit boards which are oddly shaped, and must
use breakaway panels and tabs in order to facilitate assembly.  We use
a router bit to create the void between the panel and the board itself, but
leave a small breakoff tab for the connection.  Our previous fabrication
vendor would smooth the rough burr left by these breakaway tabs, but
boards from a new vendor are arriving with the rough burrs intact.

Question:  Is there an IPC specification that dictates the allowable height
of these burrs, or do we need to specify on the drawing that the height
be witnin "X" mm of the board edge??

Thanks

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