Electronics Forum: warpage and balancing (Page 1 of 6)

Re: PCB warpage

Electronics Forum | Fri Oct 15 11:05:50 EDT 1999 | Mark Phinney

Earliar we had problems with board warpage, Much of our problem was due to imbalances in the copper on oppisite layers in brief on a 8 layer board the copper on layer 1 should = the copper on layer 8, 2=7, 3=6, 4 = 5. We added copper to some layers t

Way to solve PCB warpage

Electronics Forum | Fri Dec 17 10:42:58 EST 2010 | hegemon

I believe there is a lot pertinent information in the thread that Dave forwarded... But (IMHO)I think you can look at two things first. First, is your wave solder process friendly to this large PCB, is there enough pre-heat in the board before it h

Re: Bow and Twist of PCB's

Electronics Forum | Wed Aug 19 08:00:55 EDT 1998 | Earl Moon

| 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 orde

Granite Surface and ESD

Electronics Forum | Thu Mar 31 23:14:18 EST 2005 | Steve

Russ if your asking me if covering the surface of the granite defeats the purpose then I'm lost. An ionizer is a very good suggestion but they are not inexpensive. If the table is grounded and the metal bars are on a grounded mat, laminate etc. then

SMT optimization and improvement

Electronics Forum | Thu Jun 01 04:01:33 EDT 2006 | ts

The PT200 at line converter able to optimize your program to balance the line.

Tg and reflow

Electronics Forum | Mon Dec 19 12:21:09 EST 2005 | Amol Kane

from what i know, Tg is important from thermal stresses point of view. board warpage increases greately when Tg is exceed

Flexi boards and uBGA

Electronics Forum | Tue Jul 11 10:13:22 EDT 2006 | SWAG

Over time, you might see problems with delam., blistering and warpage if using FR4 carriers. Depending on volumes, you might consider using durostone or some robust material like that for the production runs. Keep in mind that switching materials w

High-end SPI and AOI?

Electronics Forum | Tue Oct 13 08:09:53 EDT 2009 | kudamarani08

Can anyone help me recommend or simulate a SPI and AOI machine that can balance our FUJI NXT 1 with 14 modules. We are using MPM accela printer. 200 UPH is our target. Here's the PCB dimension length(x) = 399.92mm width(y) = 141.626mm Thanks all!

Spacing and Yield

Electronics Forum | Tue Sep 18 11:34:36 EDT 2001 | jschake

The tightest spacing between neighboring 0201 components assembled was 8-mils. Please refer to the response for the query entitled �Minimizing Tombstoning Defects� posted by martys, as the response provided there is also relevant to address this que

When? How and What??

Electronics Forum | Tue Aug 22 10:06:53 EDT 2000 | George English

Has there been a definite date for the total move over to lead free? Will it be 2004 or 2008. Also is there a direct replacement for leaded solder, I have read various articles on numerous alloys suggested for the switch, such as bismuth, tin, copper

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