Electronics Forum: pcb bow measurement (Page 1 of 53)

PCB assembly bow and twist

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.

PCB assembly bow and twist

Electronics Forum | Fri Dec 27 16:26:30 EST 2013 | davef

I expect to find the specification and measurement method for the bow & twist of an assembly to be on the assembly drawing. Comments are: * Expecting that an industry committee to write a bow & twist spec for an assembly they know nothing about is n

glue measurement

Electronics Forum | Fri Oct 05 16:05:58 EDT 2001 | seand

Hello everyone, Your chief variable here is going to be your epoxy. Different materials react accordingly to various inspection methods but, DEPENDING on your print parameters and material, you may be able to utilize an inline inspection machine.

PCB strain measurement

Electronics Forum | Tue Oct 31 20:54:12 EST 2006 | Joseph

Dear all, Do you know any simple method to measure the bending strain on a PCB. I have heard of something like a special tape that changes colour when bent. This can be stick to a PCB to find the bending stress/strain but I cannot find anything on t

PCB strain measurement

Electronics Forum | Tue Oct 31 21:58:05 EST 2006 | davef

Initial thoughts are: * Strain gage http://www.omega.com/literature/transactions/volume3/strain.html http://www.vishay.com/brands/measurements_group/strain_gages/mm.htm * Moire interferometry http://www.buffalo.edu/news/fast-execute.cgi/article-pag

Copper thickness measurement

Electronics Forum | Sat Dec 10 07:33:09 EST 2005 | davef

Most board fabricators define a range of processes parameters that are routine for their plant set-up and methods. Look here http://www.divsys.com/ServicesProducts/PCB/MfgCapabilities.asp for an example. If you don't define your requirements, you'

raised component measurement

Electronics Forum | Fri Sep 18 12:21:03 EDT 2009 | kennyg

Does anyone have any off-the-shelf tool for measuring air gaps under components? Specifically to measure if a part is raised beyond special specifications, such as determining if a leaded connector is raised beyond 5, 10 or 20 mils from the PCB surf

pcb manufacturing

Electronics Forum | Fri Jul 28 10:34:14 EDT 2006 | razor9114

Don't forget about Paste height measurement, conveyors, Aqueous Cleaner, Selective Solder machine and possibly an Ionic Tester

pcb solderig

Electronics Forum | Tue Sep 01 20:43:06 EDT 2009 | davef

Please explain "adhesion of soldering is not uniform at the tips (soldering ends)." For example: * Is the "tips (soldering ends)" the component leads? * What is the component? * What is the finish on the component? * What process is causing this issu

Stencil and PCB Coplanarity measurement

Electronics Forum | Fri Apr 06 09:29:20 EDT 2018 | jacobidiego

Hi Experts, I am interested in having a tool or process to measure coplanarity between the PCB pushed-up in the printing process and the Stencil. Therefore having a way to calibrate them.

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