Electronics Forum | Mon Feb 03 23:49:00 EST 2003 | Dreamsniper
Hi, Has anyone who's using vapor phase process able to help me troubleshoot tombstoning? I raed about uneven forces during reflow due to misalignment, pad design, paste volume deposition unevenness due to dirty stencils, worn stencil printer parts s
Electronics Forum | Wed Feb 19 19:46:29 EST 2003 | adlsmt
I estimate the costs about the same but we build in batches so the wave only runs a few hours a day. We do complex boards so I think its worth it plus you have to keep the machine awhile to recoup the investment in the new nozzles. If the market gets
Electronics Forum | Fri Feb 21 19:49:36 EST 2003 | MA/NY DDave
Hi Good Luck Neil, When I first saw this process described, what you are experiencing was my first visual thoughts. Partial filling as well as huge solder voids inside of the joints. I figured for low reliability product or short life maybe this t
Electronics Forum | Wed Mar 05 03:43:58 EST 2003 | testing
Hi, Mike Thanks for the reply With your oracle system were you able to perfom SPC analysis? and if possible do you have any Material that may be helpful for me to get my system setup i.e. whether through Excel, Access, Oracle etc. + What are your
Electronics Forum | Tue Mar 18 09:11:14 EST 2003 | Rob C
With a standard valve and no-clean solder paste you may get a few good dots. But, repeatability will be terrible too many variable, air-pressure, board height (two post nozzle), valve time on/off, retract height, retract time, etc... A RMA paste wi
Electronics Forum | Thu Mar 27 10:22:27 EST 2003 | johnwtg
We have about 17 4790s and 4791s that use the UCT-50 software to load parts/programs. This software only seems to work under Windows 98. The rest of our plant is running WinNT and will be upgrading to Win2000 soon. Our programmer have dualboot sys
Electronics Forum | Tue Apr 01 13:01:27 EST 2003 | cnotebaert
I have NOT done 0402's yet but also have no trouble with 0603's. Did you try any thinner stencils? I don�t know this for a fact just speculating, I would think the 0402's have a smaller brd to chip gap and that you might be able to get away with a 4
Electronics Forum | Thu Apr 10 09:42:03 EDT 2003 | Chrissie Neale
Russ Exactly what i was looking for! I spoke to the operators of the machine who said it does record the reject rate, but it hasn't been reset since the machine has been in there so that's pretty useless, although there's a couple of boards going do
Electronics Forum | Thu Apr 10 17:44:22 EDT 2003 | davef
Q1: Can they be masked so parylene doesn't get underneath? A1: Your parylene applyer may be able to mask area, but in general no. This stuff is cured in a vacuum chamber to make sure that it gets into every past corner. Q2: How do you remove and re
Electronics Forum | Thu Apr 10 14:35:18 EDT 2003 | russ
What flux are you using to put them back on? you should be able to adequately clean the site after removal with alcohol or water depending upon the type of flux. "White grungy" usually comes from a liquid flux such as Alpha 857 being squirted on th