Take an 85 gauge pin, hold one corner of the board down with your finger. If
the pin fits under the opposite corner, it fails IPC specs.
Deac
Deac Descoteaux
PalPilot, East Coast Corporation, (PEC)
Director of New Business Development
71 Spitbrook Road, Suite #307
Nashua, NH 03060
office # (603) 888-3400, ext. #10
Toll Free # (877) PALPILOT, (725-7456)
Fax # (603) 888-3500
Cell Phone# (603) 557-7568
email address: [log in to unmask]
emergency email:[log in to unmask]
www.palpilot.com
PCB LAYOUT * SIGNAL INTEGRITY * PCB FABRICATION * METAL CHASSIS * PLASTIC
MOLD INJECTION * BACKPLANE SOLUTION * CONNECTORS
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-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
McGlaughlin, Jeffrey A
Sent: Thursday, March 08, 2007 7:05 AM
To: [log in to unmask]
Subject: [DC] Post Assembly Bow and Twist
Technet and DesignersCouncil Gurus -
I have been asked by our mechanical engineering group to find out if
there is a standard or specification for post assembly flatness of
printed circuit cards. This has never been an issue for functional
failure but a new design requires that a row of LEDs mate to a display
panel mask such that no light leaks from one LED cell to the next. Their
concern is that post assembly bow and twist will over stress solder
joints and board copper if they mechanically stress the cards by
pressing/pulling them flat to an assembly frame. Can anyone direct me
to a standard or advise me on the maximum allowable bow and twist for
this type of situation?
Jeffrey McGlaughlin, CID
Engineering Designer
Battelle
505 King Avenue
Columbus Ohio 43201-2693
(614)424-7582 Phone
(614)458-7582 Fax
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