Electronics Forum | Sun Mar 22 15:29:01 EST 1998 | Michael Fogel
What is the right way to count the opportunities for defects in order to calculate the quality (in ppm) of SMT assembly processes as well as the quality of the PCB's? Please replay to: fogel_m@netvision.net.il or micha.fogel@ecitele.com
Electronics Forum | Wed Jan 16 20:06:09 EST 2002 | davef
No, not as such. Consider: * Using the IPC calculator [free at http://www.ipc.org]. It allows you to consider / assess the amount of solder when designing pads. * Reviewing IPC-7525 - Stencil Design Guidelines. It gives general aperture guidelines.
Electronics Forum | Wed Jan 16 15:22:29 EST 2002 | Terry Burnette
In his book titled "Manufacturing Techniques for Surface Mount Assemblies" author R.J. Klein Wassink describes the relationship between solder land dimensions, component lead coplanarity, board warpage, solder volumes, and solder paste flux wetting b
Electronics Forum | Wed Mar 25 21:49:32 EST 1998 | Alberto Cervantes
| What is the right way to count the opportunities for defects in order to calculate the quality (in ppm) of SMT assembly processes as well as the quality of the PCB's? | Please replay to: | fogel_m@netvision.net.il | or | micha.fogel@ecitele.com
Electronics Forum | Tue Mar 24 09:53:01 EST 1998 | Steve Schrader
| What is the right way to count the opportunities for defects in order to calculate the quality (in ppm) of SMT assembly processes as well as the quality of the PCB's? | Please replay to: | fogel_m@netvision.net.il | or | micha.fogel@ecitele.com Ch
Electronics Forum | Fri Sep 16 09:14:29 EDT 2005 | actech
We have just launched a new contract assembly house and I was wondering if there was anybody out there that had an honist formula for calculating labor cost for the purpose of bidding assembly work, "is there a good canned software package that actua
Electronics Forum | Wed Jul 30 07:22:17 EDT 2008 | davef
Not sure what software you have, but somehow you must be accumulating costs by process and you probably know [or can figure-out] how many boards you processed. From this, you can calculate a standard cost of a process. Continuing, there is a thread,
Electronics Forum | Tue Aug 12 19:18:34 EDT 2008 | arminski
Hi davef, couple of questions: clarifying costing of direct labor against overhead cost: an operator loading PCB onto the reflow oven is a direct cost, how about the reflow process time of the PCB while travelling inside the reflow, is that an ove
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 | Thu Dec 05 17:45:31 EST 2002 | Gris
Hi, Is the limit for " 10.07 " for assemblies ? I guess we need to calculate how much ionic residue the boards see after assembly and cleaning. and then calculate back to the board spec if i am not mistaken ? For bare fabs we have to access the li
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