Electronics Forum | Thu Oct 14 18:25:29 EDT 1999 | JAX
Grace, You can get the information you need from IPC. Measuring board warpage is covered in theie 610B manual. It will let you know the what can be reworked and what cannot.
Electronics Forum | Thu Oct 14 20:42:07 EDT 1999 | Jeff Ferry
Grace, As deifned in IPC 7721 Procedure 3.2 Bow and Twist Repair "Bow and twist after soldering shall not exceed 1.5% for through hole PC boards and .75% for surface mount PC boards. The bow and twist shall not be sufficient to cause difficulties d
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 | Sun Aug 24 08:57:56 EDT 2008 | davef
For an nate measurement method, look here http://www.ipc.org/4.0_Knowledge/4.1_Standards/test/2.4.22c.pdf For bare boards, look to IPC-6012, par. 3.4.4 For assemblies, look to IPC-A-610
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 | Thu Oct 14 04:28:29 EDT 1999 | Grace Chua
Hi there, I have quite a number of problematic bd due to warpage problem. I would like to know the method on how to measure PCB warpage, thus to decide on the dispositon of these boards. Another question, can these warp bd be rework/fix. Is there
Electronics Forum | Tue Oct 07 03:55:03 EDT 2014 | puja
How to avoid /reduce warpage in long length PCB &
Electronics Forum | Wed Sep 02 11:41:29 EDT 2020 | pradeep14
How to reduce the PCBA warpage issue after Reflow oven for 1mm PCB Thickness
Electronics Forum | Tue Oct 07 22:15:12 EDT 2014 | padawanlinuxero
How to avoid /reduce warpage in long length PCB & > _1.6MM THICK PCB. You need to put it in a fixture or pallet to run it in the reflow oven, most common material use here is durostone for the pallets that we run in the reflow oven, we use Durosto
Electronics Forum | Tue Oct 07 08:44:49 EDT 2014 | emeto
Hi, 1. I will run the board on the mesh if single sided. 2. For double sided board, I will try stiffeners. 3. If stiffeners don't work, then you have to create a handling fixture(holds the board and has enough openings to let the air flow to the PC
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