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 | 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
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.
Electronics Forum | Mon Apr 09 22:40:38 EDT 2018 | jacobidiego
What kind of level have micrometer precition?
Electronics Forum | Wed Apr 11 21:00:54 EDT 2018 | jacobidiego
What I mean is.... What Brand and Model should I buy to measure coplanarity between this 2 surfaces that could measure micrometers of difference I think that normal bubble levels are not precise enought for this use ^^
Electronics Forum | Mon Apr 09 11:39:32 EDT 2018 | emeto
The easiest way to do without special tools is to use level. Check machine co-planarity on the conveyor rails in both directions(you can do that with rails down or rails up or both). Then check co-planarity on the stencil. If the level shows the sam
Electronics Forum | Tue Apr 10 16:27:20 EDT 2018 | emeto
Of course, the more accurate the better. However, it might be a challenge to calibrate with really precise one - still better to take your time and do it right. Good luck!
Electronics Forum | Tue Jan 29 10:17:02 EST 2019 | bane016
I want to know how you measure capacitance and resistance to 01005 components?Is there such a machine for automatic measurement of component values on PCB? We have a lot 01005 components and we lose time to measure first panel components...I'm inter
Electronics Forum | Fri Apr 20 05:32:39 EDT 2001 | dougie
Hi, I've just splashed out �60 on IPC-A-600F trying to find out the formula for measuring the bow and twist of raw PCB's. Much to my dismay there are 10 lines on the subject in the whole standard. Worse still is that it tells me nothing I don't alre
Electronics Forum | Fri Apr 20 07:30:14 EDT 2001 | wbu
In short: the measured deviation / the length this deviation occurs * 100% = % of deviation Actually we encounter mostly "twist" so we put the board on a flat surface, hold it down at the corners to see if any of the corners lifts, measure the heig
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