Electronics Forum | Thu Jun 24 15:33:56 EDT 2010 | davef
Our best suggestion - get the copper balanced and if possible go to higher Tg materials.
Electronics Forum | Thu Jul 13 04:01:02 EDT 2000 | JohnW
Dave, Firstly..how the heck are you?..been a while.... Ok so I'm running an Electrovert Electra witha hot gas knife, & I've got large server boards going over the wave. I've seen us loose chip, mainly Tants on the hot gas knife...ain't good especia
Electronics Forum | Fri Apr 20 07:12:22 EDT 2001 | wbu
Dougie, oh yes, it�s a bit short that chapter. I have the Revision e in front of me and this one contains in the appendix the needed IPC-TM-650 Test method for bow and twist. Can�t think that they don�t have that in the new revision. Hope you find
Electronics Forum | Mon Apr 23 14:03:18 EDT 2001 | Ryan Jennens
Dougie- We,too, have the IPC-A-600F, and the spec. refers to IPC-TM-650 test method in the back of the book. Look on page Number 2.4.22 of the test methods appendix. This outlines the procedure for determining the percentage of bow and twist,
Electronics Forum | Wed Aug 19 05:00:56 EDT 1998 | Tom Blum
Hi there, I'm actually facing a lot of trouble with PCB's presenting up to 3mm of bow /twist at reception i.e. before assembly. The PCB size is 220 by 230mm. The boards are to be assembeled SMD double sides with 05.mm pitch on both sides. In order to
Electronics Forum | Wed Oct 17 02:53:36 EDT 2001 | dszeto
The fine pitch QFP is a 240 pin one being loaded with other components on a 2.0mm thick FR4 PCB. There are 6 of this Qfp's on this PCB showing the same charactristic of bowing therfore the solder fillets are vary from the center to the end of the pa
Electronics Forum | Tue Jun 29 00:23:11 EDT 2010 | dontfeedphils
Is this a single PCB or a multi-up array? At the very least you should probably pick up a universal wave pallet, check out AGI or DMI. -Phil
Electronics Forum | Thu Sep 16 07:07:34 EDT 2004 | C Lampron
Hello Chris, "It sticks up about 3/8" or so above the surface of the board." Is this over the ridgid portion of the PCB or in between? Is it possible to create a support fixture for printing that has relief that will allow the flex to bow downward i
Electronics Forum | Fri Jun 11 03:39:26 EDT 1999 | Gyver
| | | | Hello all! | | | | Recently we got a problem about the Funtional test. Some boards passed tests by using the auto-fixture(vacuum), but failed by using manual test fixture(need to plug CPU, DIMM etc.). The error symptom is no picture. We doubt
Electronics Forum | Fri Apr 20 13:55:09 EDT 2001 | kawiederhold
Hey Dougie, If you go to IPC.ORG and click on the on-line resources and databases, then on the "free downloads" link, the second or third document "for free" is the IPC-TM-650 in its entirety. It does discuss the test you are looking for! Have fun
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