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November 2009

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Subject:
From:
Paul Edwards <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Paul Edwards <[log in to unmask]>
Date:
Fri, 6 Nov 2009 12:33:44 -0800
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I agree with Steve and the rest but I have one caveat....

If you use PEM specs for design, you must use PEM parts...

PEM-type parts are different then PEM parts, even the PEM knockoffs are different...

Every time you use a PEM-type part in a PCB you will have problems...

Switch to actual PEM parts and the problem seems to go away...

Paul

Paul Edwards
Surface Art Engineering


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Smith
Sent: Friday, November 06, 2009 11:41 AM
To: [log in to unmask]
Subject: Re: [TN] PEM (rivets) in PCB - Found word(s) list error in the Text body

We have used PEM standoffs, studs and nuts in pc boards, sheet metal, and copper bus bars for years.  I can think of only one assembly house having any problem with the pc board mount type and that was because they didn't install them as recommended by PEM.  As Lenny Carter said, if you use them as intended you should have no problems.

My regards,
Steve Smith
Project Engineer
Staco Energy Products Co.
"Your tailored power solutions provider"
Web Site: www.stacoenergy.com



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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lenny Carter
Sent: Friday, November 06, 2009 2:23 PM
To: [log in to unmask]
Subject: Re: [TN] PEM (rivets) in PCB

There are specific PEMS designed for pcb materials, in differing thicknesses.  See their website at www.pemnet.com.  If you are having the assembly made by a CM, you  may want to discuss your requirement with them, as they may have their own guidelines.  I have used many PEMs over the years, in FR4, aluminum enclosures, and other various composites.  I have always had surprisingly good results when they are used as intended and installed correctly.  You may have a significant component "keep out" for tooling and pcb stresses, depending on your application.  good luck.  Lenny ERG


----- Original Message -----
From: "henry rekers" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, November 06, 2009 1:54 PM
Subject: [TN] PEM (rivets) in PCB


Is anybody out there aware of any spec/inspection criteria/documentation on how to specify/design/inspect Pem type fasteners?

We have a design that may require this, but I'm not willing to commit until I have some more background info. Specifically, is this a normal process for a board shop? Are there any 'gotcha's'?

Thanks.


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