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 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 | Fri Aug 28 15:39:14 EDT 1998 | smd
Does anyone know about the ANSI/IPC PCB warpage standard? What is the best way to determine weather boards are warped or not? What equipment works best? Or, is there a general rule of thumb that is also compliant with the standard? I would like to he
Electronics Forum | Fri Aug 28 16:24:56 EDT 1998 | Dave F
| Does anyone know about the ANSI/IPC PCB warpage standard? What is the best way to determine weather boards are warped or not? What equipment works best? Or, is there a general rule of thumb that is also compliant with the standard? I would like to
Electronics Forum | Thu Apr 07 20:16:23 EDT 2005 | davef
Q1) Simple way to measure the PCB warpage A1) IPC-TM-650; Method 2.4.22 Bow & Twist Q2) What is the maximum warpage can the SMT machine allow the to accept and place the component without problem. A2) That depends. IPC-A-610 Acceptability of Elect
Electronics Forum | Fri Apr 08 19:55:48 EDT 2005 | Dhanish
The problem is IPC spec. calls for 7 mils/inch but my equipment spec. calls for Warpage as 40 mils.Our Equipment folks saying if a board warps more than 40 mils ,there will be placement issue.
Electronics Forum | Fri Aug 30 11:17:19 EDT 2013 | jth
Hi, the BGA and/or the PCB may be warping excessively during reflow. We offer testing services to measure warpage of BGAs and PCBs during reflow to JEDEC and IPC standards. Let me know if you'd like to learn more about our services: joe@zntechnolo
IPC is the trade association for the printed wiring board and electronics assembly industries.
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