Electronics Forum | Fri Feb 19 12:56:34 EST 1999 | Tony A
| Please could you suggest a recommended aperture sizes for | printing of smd adhesives. Any recommendations on stencil thickness as well as stencil finish will be appreciated. | Mark, talk to Irene Horvath at I Source Technical Services, Inc. Her
Electronics Forum | Mon Feb 22 12:04:15 EST 1999 | Dave F
| Please could you suggest a recommended aperture sizes for | printing of smd adhesives. Any recommendations on stencil thickness as well as stencil finish will be appreciated. | Mark: About the only rule of printing adhesives is: Keep it off the
Electronics Forum | Fri Aug 10 13:52:58 EDT 2001 | davef
When you say that glue viscosity changes for lot to lot, is this LOT TO LOT of your product OR Loctite�s product? And when you say that glue viscosity changes, what do you mean [eg, increase by � , decrease by � , er watt?]. What specifically is th
Electronics Forum | Tue May 15 09:01:41 EDT 2001 | davef
Stephan makes good points. While monitoring the temperature in the plant is good, it might be more appropriate to measure the temperature in the cabinet of your dispensor. A sure indicator of temperature change is process changes over time. Consid
Electronics Forum | Mon Jun 04 10:40:37 EDT 2012 | davef
I'm not aware of any such stipulation about witness [probe] marks for assembled boards, per se. Certainly, witness marks should not affect the intended performance of the assembly, you know, like damaging the solder connection or smudging solder mate
Electronics Forum | Wed Dec 20 07:54:13 EST 2006 | davef
We pipe a nonfunctional witness mark on every board. We inspect the witness mark. Ours consists of six pairs of dots arranged in a five-pointed star pattern. Again, consider paying attention to the cause of the problem. Your machine is NOT operat
Electronics Forum | Thu May 04 13:35:28 EDT 2017 | jmathis
Hello All, I was given an assembled flex circuit PCB and asked how the board was depanelized as there are no view-able witness marks that I can see. Any ideas? Thanks in advance on any insight to depanelizing without leaving witness marks on the F
Electronics Forum | Mon Jun 04 23:52:57 EDT 2012 | rway
Actually, if you experience lack of witness marks, you probably have a problem. Witness marks are OK and will not affect your assembly. I assume this is an SMT assembly we are talking about, in which case, this is what your test pads are for. You
Electronics Forum | Thu Apr 19 21:42:10 EDT 2001 | davef
You appear to spending too much time watching "Survivor" and too little down at Jimbo's I'm not sure "Gettin' Jiggy Wit Flux" translates well. My first recollection of jiggy is ... Will Smith "Gettin' Jiggy Wit It" Bring it. Whoo! Unh, unh, unh,
Electronics Forum | Fri Mar 09 15:10:08 EST 2007 | oldsmtdude
Simple question... Not so simple answer. It depends largely on process spec and honesty of the people running the test. Most will jump to throw out the flyers as "special cause". So if you didn't set the spec and didn't witness the run and measu
