I have had failures associated with overtorquing a screw to the point
that it pressed through the laminate and shorted to an internal trace.
Pretty severe overtorge (basically they didn't use a torque limited
device at all); I would point out however that this type of mechanical
damage should be rejectable to 610 (irregardless of the root cause.)

Jim

 =================================
Jim Maguire
Intel Corporation
Engineering Support - 
     Dupont Corporate Environmental Lab
Ph 253-371-4065
Fx 253-371-5779
pager 866-217-5222  [log in to unmask]
Email [log in to unmask]
================================= 
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Thursday, October 12, 2006 11:54 AM
To: [log in to unmask]
Subject: [TN] Compression Limit on FR4?

Does anyone know of any guidelines or recommendations that
suggest a maximum limit on compressing board material?

Can any damage occur by over-torque'n screws, for example?

I've never heard anyone discuss that...

Jack

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