Electronics Forum | Tue Aug 24 17:59:10 EDT 2010 | davef
A board support must be used to prevent bowing of the board during insertion of the sockets. It should have a flat surface with holes or a channel large enough to receive the sockets during installation. [Tyco AUGAT HOLTITE Socket Application Note 11
Electronics Forum | Thu Aug 09 07:53:16 EDT 2012 | davef
Allowable bow & twist: Together, both IPC-A-600G and IPC-6012B represent the core IPC documents for describing the acceptable and nonconforming conditions that are either externally or internally visible on finished printed boards. IPC-A-600G relies
Electronics Forum | Mon Nov 01 15:35:25 EST 2004 | Ken
Agreed. You will find different part manufacturers have different coplanarity specs. In fact I have on supplier that calls out 7 mil max coplanarity. Then factor in board bow and twist and it becomes a real joy.
Electronics Forum | Mon Apr 04 09:30:49 EDT 2005 | russ
Andrew, we need a lot more information to help. 1. what is the open caused from? bemt pins, non-wetting, board bowing, or no paste deposited. 2. What is your current stencil design? 3. What does this connector look like and what are the pins? Rus
Electronics Forum | Wed Dec 19 09:23:47 EST 2001 | davef
Bow & twist for bare boards and panels: IPC-A-610 1.5% for PTH only and 0.75% for SMT
Electronics Forum | Mon Feb 02 16:42:03 EST 2004 | davef
Bow & twist for bare boards and panels: IPC-A-610 1.5% for PTH only and 0.75% for SMT. So, what are you doing to these poor boards to make them warp?
Electronics Forum | Tue Aug 26 09:33:04 EDT 2008 | wavemasterlarry
If this board is waved soldered than you may want to look at the wave causing the BGA to reflow a 2nd time when it goes over the wave. The board bows down and the the joint liquidfies and then hardens before the board fully goes back to flat which c
Electronics Forum | Wed Jul 12 21:32:59 EDT 2000 | Dave F
John: Several thoughts: 1 What on your wave machine are these bowed boards catching on? It has to be something on either wave. Are you getting hung-up on the chimney? That doesn't seem correct!!! 2 Why do you want to measure the defection of y
Electronics Forum | Mon Oct 03 19:15:32 EDT 2005 | cn
is this a single brd or multi up array? What is the thickness? where were the brds made, state/country? I had an issues with a brd which was fabed in mexico during the humid months there was mosture trapped in the brds which caused many strang things
Electronics Forum | Tue Jun 14 14:57:29 EDT 2022 | glasscake
Check for warp during reflow or placement, if your board is bowing you are not going to make a good solder connection. If your board is warping during reflow you may need to make a currier to support the board during reflow if using the edge to tran
