Electronics Forum | Tue Jan 25 16:21:28 EST 2000 | Rex Breunsbach
My experience with weighing fluxed boards or cardboard is pretty dismal. Problem is the solvent in the flux evaporates about as fast as you can weigh it. One approach I have seen used to improve accuracy is to weigh and record the weight at 30 secon
Electronics Forum | Sun Jan 23 08:18:14 EST 2000 | Dave F
Jeff: I feel your pain. Your points about pin-in-paste stuff are well taken. Consider increasing the size of the pad containing the via. * Calculate volume of the finished via. * Multiply this volume by 2 to determine the volume of paste that mus
Electronics Forum | Sun Jan 23 21:47:23 EST 2000 | Jeff Sanchez
Hey Dave, If ya wanna feel my pain come help build these little babies......hehe. Thanks for the process. I will print your thread and give it a shot. It sounds good to me. I am not so sure if I can get them to inlarge the pads but I can try? The pad
Electronics Forum | Tue Jan 18 12:44:24 EST 2000 | Russ
I have found that reducing the amount of metal in the joint makes a difference, we have reduced the aperture sizes to provide a minimal amount of paste. just enough to hold the part during handling. You may also want to try and slow the initial ram
Electronics Forum | Wed Jan 19 02:00:36 EST 2000 | erico
Hi wolfgang, I think Pc is not talking about the tombstone cause this terminal lifted is different from tombstone. The terminal of chip is still there but can not be solder anymore so we have to replace the chip. I also facing this problem. So can yo
Electronics Forum | Sat Jan 15 21:52:15 EST 2000 | Dave Bartlett
I am looking for information comparing the reliability of smt boards vs thru hole boards. Also, information on when to use thru hole instead of smt if there is such a case. Background - We currently make temperature controller with a mix or smt and
Electronics Forum | Mon Jan 31 21:11:09 EST 2000 | Dave F
Dave: Find: "Comprehensive Surface Mount Reliability Model Covering Several Generations of Packaging and Assembly Technology", by J. Clech et.al. IEEE Trans on Comp. Hyb. and Manuf. Tech. Vol. 16, No. 8 Dec. 1993, p.949. It listed cycle to failure
Electronics Forum | Mon Jan 17 04:08:48 EST 2000 | Stefano Bolleri
Same problem for me. I'm a registered user, but when I fill out the "login" box, I get back to the main page as nothing had happened. And of course, not even the link to the e-mail section. I had problems like that in the past, due to not accepting c
Electronics Forum | Mon Jan 17 08:16:57 EST 2000 | Michael Bryant
As a result of our recent upgrade, we are having trouble logging in users who don't except cookies. We are working to fix this problem as quickly as possible, but there is a way you can make it work in the meantime, if you wish. Simply go to your bro
Electronics Forum | Fri Jan 14 16:48:40 EST 2000 | Steve Thomas
O.K., folks, I know this is a loaded question, but I've been asked to find the answer, sooooo: What is an acceptable defect rate in ppm for a surface mount process, assuming that each component has the potential for one defect. This would include de
