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September 3, 2014 - Updated August 26, 2014 - Originally Posted V - Scoring PCB QuestionI am considering scoring a PCB with a 90 degreescoring blade after SMT placement and reflow to create a card edge connector ona PCB. I would score deep enough to bevel and depanelize in 1 step. Is there a precedence for doing this? Are there any horror stories of failures? B.S. |
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Expert Panel Responses | |||||||
I'venot heard of anyone doing the scoring after SMT, though I’m sure it has beendone. I can’t think of any show stoppers... there are, however, some risks thatneed to be addressed. Here are the ones I can think of:
Process Engineer Astronautics Fritz's career in electronics manufacturing has included diverse engineering roles including PWB fabrication, thick film print & fire, SMT and wave/selective solder process engineering, and electronics materials development and marketing. Fritz's educational background is in mechanical engineering with an emphasis on materials science. Design of Experiments (DoE) techniques have been an area of independent study. Fritz has published over a dozen papers at various industry conferences.
You will generatepost-assembly dust that will include metal (copper) particulates. Otherwise,going sufficiently deep to depanel with a 90-degree cutter will produce amoderately wide bevel. Other issues depend on actual PCB substrate and v-scoreprocess control. President Circuit Connect, Inc. Bob has been in PCB design and fabrication since 1976. He has held elected positions with the SMTA, is a member of the MSD Council, has served as a committee member for various IPC standards and is a Certified IPC Trainer.
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