Ron,
We fabricate and assemble pcb's every day and I can tell you there is no
one rule that fits everything. We have a "nipper tool" that places near
zero stress on the components for mouse bite removal. The only
restriction is being able to get to the tab. So we place the mouse bites
where there are no large components near the board edge and we use
almost the entire pcb surface for parts placement. Again, there is no
perfect rule, so you must be aware of board material, thickness, type of
components, panel size, and who is doing the fab and assembly. Sorry
there is no easy answer.
Regards,
Steve Grogan, Operations Manager
Hunter Technology Corporation
2921 Corvin Drive Santa Clara, CA. 95051
408-328-9722 [log in to unmask]
Fax 408-245-6110 www.hunterpcb.com
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
James, Ron CAR
Sent: Monday, April 04, 2005 1:44 PM
To: [log in to unmask]
Subject: [DC] Spacing between SMT and breakaway
IPC-7351 discusses V-score and "mouse bite" breakaway
patterns, but I can't find a recommended spacing between
those and SMT parts. Does this exist in another IPC spec?
Or can anyone provide the benefit of their experiences?
In-house we specify .200" clearance from v-score, but have
nothing formal for the tabs. The mouse-bite breakaways
are called "low stress", so I am hoping to place the SMT
parts closer than with v-score.
Thanks for any pointers,
Ron James, C.I.D.
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