Ron

Design the breakaway area such that, after breakoff, the burrs do not
extend beyond the circuit edge. Then there's no need to do anything.

Our design uses approximately 25 mils (only at the exact breakaway
location) to accomplish this, which has not turned out to be a big
design penalty.

Regards

Gerry
------------------------------------------------------------------------
--------------------------------------
>----------
>From: 	Ron Oneal[SMTP:[log in to unmask]]
>Sent: 	Thursday, January 16, 1997 4:22 PM
>To: 	[log in to unmask]
>Subject: 	FAB
>
>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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