Electronics Forum | Wed Nov 06 16:31:59 EST 2002 | slthomas
I would also consider paste control (don't take it personally...I always have to get after people about this one), time on the stencil, time between print and reflow, solderability of the component leads, paste volume (that one really got us once....
Electronics Forum | Mon Aug 23 10:11:55 EDT 2010 | flipit
Hi, I have never been able to find an acceptable dispense process for dispensing small dots of solder paste. I currently have an auger screw automated dispense system and can not accomplish 0.010" dot sizes. In addition, stencil printing is much m
Electronics Forum | Tue Dec 11 12:29:57 EST 2012 | deanm
Thanks for the comments so far. The smallest nozzle I've tried is a 4mm, which is what Pillarhouse used on this board to provide a sample. I tried this but wasn't as good as the 6mm. I've soldered the same connectors on a different board using a 10mm
Electronics Forum | Wed Sep 18 18:41:17 EDT 2002 | davef
People have made good comments. Additional points are: * Your bridging is probably being caused by one or more of the following: [1] printing too much paste, [2] smearing the paste during placement or subsequent handling, or [3] paste slump during t
Electronics Forum | Tue Sep 26 09:27:10 EDT 2000 | Chris May
LarryK, It all depends upon your volume / problem. As Jax says, if this is a repeating problemo, get QA & Purchasing involved. Is it your stores ? Do they receive 100 off and "decant" 20 into a tube (manual handling error, training etc;). From your
Electronics Forum | Wed Apr 11 14:05:30 EDT 2001 | davef
No, there's not a really great epoxy product for attaching thermocouples in reflow. Specifically, what's your problem? From Sanders Temprobe verbage ... Adhesives There are two general classes of material commonly used to adhesive bond thermoc
Electronics Forum | Thu Sep 19 11:14:45 EDT 2002 | Jim M.
We had lots of problems with bridging on 15.8mm pitch, QFP17-160 at the start.The board was .032 thick, double sided-six boards to a panel. Here is the problems (not neccessarily in the biggest to little but as i remember them) and solutions that he
Electronics Forum | Thu Aug 20 13:01:40 EDT 2009 | bman
When I've seen white strands in the solder on SMT boards, it's been fibers from stencil wipes that stuck to the stencil, then transfered to the board when it was printed. I'm not sure why this would only happen with fine pitch components though.
Electronics Forum | Mon Sep 08 20:55:04 EDT 2008 | davef
Of the six pads in the picture, which are the two that are unacceptable?
Electronics Forum | Tue Sep 09 07:42:25 EDT 2008 | wavemasterlarry
God..... give it a rest.
