Electronics Forum | Thu Dec 26 12:12:55 EST 2013 | igorfo
Dear Friends, I need your help to understand requirements and measurement methods for bow and twist of assembled PCB (PCBA have and SMT and TH components). I already check all posts on the site but didn't found any related to my question answers.
Electronics Forum | Thu Aug 18 06:06:07 EDT 2016 | technotronix
Here is a PCBA Warpage calculate method after complete SMT/Through hole assembly Warpage calculation method = warping height / length of the curved edge
Electronics Forum | Fri Apr 08 05:10:10 EDT 2005 | siverts
What is Your customers requirements? Is the PCBA mounted with front/back connectors? Will the PCBA be mounded in a rack and connected to opposite connectors on the other side? In this case, if the warpage is more than approx 1-1.5 % You will then n
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 | Wed Aug 17 06:30:50 EDT 2016 | thaneshsivanadian
Hi Guys, i have some doubt, may i know how to calculate the PCBA warpage after complete of SMT and through hole process? Do we have any calculation for that? And What is the acceptance level of warpage after complete assembly? Thanks, Thanesh
Electronics Forum | Fri Jul 27 05:37:04 EDT 2001 | bayanbaru
Hello, Does anyone calculate the Chip Shooter utilization? Our utilization is calculate as follow: A = no. of actual parts place in a week B = no. of part count multiply by tact time multiply by 168 hours. Utilization = A/B What is the benchmar
Electronics Forum | Wed May 16 15:22:25 EDT 2007 | mainenetservices
Below is a call-in question: Has there been a Benchmark study done for Best-In-Class Cost Per Placement of components on PCBA? Also, is there an industry standard to calculate cost per placement of components on PCBA? Any help would be greatly app
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 | Sat Nov 18 21:20:58 EST 2006 | Fer
Dave, May I ask where did you find the 1.5%, or the goal of .005" (or .007") per inch? The IPC-A-600 bow and twist standard calls for a .75% based on the calculation of the test method TM-650, method 2.4.22, which calculates the percentage based on
Electronics Forum | Wed Apr 02 12:50:01 EST 2003 | rdr
Does anyone know of any standards that deal with the physical location of BGAs on a PCBA? I am looking for something that states to not put BGAs in the center Axis of assemblies for bow and twist reasons. We have always informed customers to locate
