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November 2010

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Subject:
Re: Military PWB drawing note "CRUSH ZN"
From:
Ian Hanna <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 16 Nov 2010 12:11:36 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (94 lines) 
more likely refers to the condition -after- assembly -- is there a PEM Nut 
or other type of compressed fitting installed?





Steven Creswick <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
11/16/2010 12:00 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Steven Creswick <[log in to unmask]>


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Subject
Re: [TN] Military PWB drawing note "CRUSH ZN"






David,

My suggestion is that they are allowing for laminate damage [crush zone]
within a 0.250" diameter around the hole. 

As you make a countersink or counterbore a hole you will end up tearing up
the laminate.

Sharp tools - change often


Steve Creswick
http://www.linkedin.com/in/stevencreswick




-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David Paluck
Sent: Tuesday, November 16, 2010 11:34 AM
To: [log in to unmask]
Subject: [TN] Military PWB drawing note "CRUSH ZN"

I'm working with an military PWB fab drawing from 1994. It contains a note
saying "CRUSH ZN .250 DIAMETER" with an arrow pointing to a countersunk or
counterbored hole. Can anyone tell me exactly what this means?
Thanks




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