On normal 2 layer PCBs, I've seen my boards stay flat & fine through the SMT mounting
process, but after the wave pass, they would have an arch in them. When I changes the
design to a 4 layer board, it no longer happened. I think the material on the 4 layer
was of better refinement than the 2 layer, even though both boards came from the same
manufacture.
_____________
Brian Guralnick
----- Original Message -----
From: "Dennis Saputelli" <[EMAIL PROTECTED]>
To: "Protel EDA Forum" <[EMAIL PROTECTED]>
Sent: Thursday, July 19, 2001 6:49 PM
Subject: Re: [PEDA] Bow & Twist
| I've occasionally had boards received nice and flat from board fab, and
| then have substantial bow and twist after assembly
|
| Dennis Saputelli
|
| Brian Guralnick wrote:
| >
| > Also, bow & twist for a flex PCB is a whole new ball game.
| >
| > _____________
| > Brian Guralnick
| >
| > ----- Original Message -----
| > From: "Harry Selfridge" <[EMAIL PROTECTED]>
| > To: "Protel EDA Forum" <[EMAIL PROTECTED]>
| > Sent: Thursday, July 19, 2001 2:33 AM
| > Subject: Re: [PEDA] Bow & Twist
| >
|
|
| --
| ___________________________________________________________________________
| www.integratedcontrolsinc.com Integrated Controls, Inc.
| tel: 415-647-0480 2851 21st Street
| fax: 415-647-3003 San Francisco, CA 94110
|
|
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* To post a message: mailto:[EMAIL PROTECTED]
*
* To leave this list visit:
* http://www.techservinc.com/protelusers/leave.html
* - or email -
* mailto:[EMAIL PROTECTED]?body=leave%20proteledaforum
*
* Contact the list manager:
* mailto:[EMAIL PROTECTED]
*
* Browse or Search previous postings:
* http://www.mail-archive.com/proteledaforum@techservinc.com
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
