Electronics Forum | Tue May 22 17:13:58 EDT 2007 | mefloump
No nitrogen generator. We have a service bring us nitrogen tanks every week and have the machine set up so if one goes empty, we can turn on the other one to keep a seamless flow of productivity. Our waves run from 6:00 am until 3:30 am between 2 shi
Electronics Forum | Tue May 29 05:00:41 EDT 2007 | lococost
Grant, apart from troughput another thing to consider is boarddesign, If there is any SMD within a diameter (eg 3mm) of the connector you won't be able to solder them. I think those are the 2 main disadvantages of selective. That being said, for le
Electronics Forum | Tue May 22 11:03:11 EDT 2007 | Michelle
We now have an AOI in our process after printing and have noticed that all the small aperatures are getting clogged by solder paste. Mainly on all fine pitch parts. We are using Kester ws R562 SN63/PB37 mesh -325+500 90% metal. It was manufactu
Electronics Forum | Sat Jun 02 08:47:25 EDT 2007 | mika
I almost forgot; If the pcb have HASL (Non RoHS) surface finish, then big fine pitch QFP:s could be shifted during reflow, beacuse of the un-even pad-surface... We have been trough that scenario also... But step No.1 is to make sure that the componen
Electronics Forum | Fri Jun 01 08:29:41 EDT 2007 | patrickbruneel
OR: Stands for organic (organic acid based flux) with the absence of rosin and/or resin. If you want to know everything about the classification of fluxes get the J-STD-004 �Requirements for Soldering Fluxes� at following link: http://webvision.ipc
Electronics Forum | Fri Jun 08 13:49:11 EDT 2007 | ck_the_flip
From my past experience, you can usually get away with OUT the chip wave if your SMD's are no smaller that 0805, and more importantly, there are no SOT23's. A nice, clean, inerted laminar wave (with a little smart or omega help) will solder your S
Electronics Forum | Fri Jun 08 17:22:51 EDT 2007 | naynayno
We have been producing an IMS assembly with SMT dpak's for some time. However, we recently encountered a new problem by chance - the parts can be flicked off with a finger nail. I state by chance because the solder joints are wetted and shiny with
Electronics Forum | Wed Jun 13 15:40:44 EDT 2007 | slthomas
Edited because I completely misinterpreted your post. We used 2 lengths of Durapol with slots for the board edges and a shorty (free-floating, not attached) under the middle. Not much more elaborate than your titanium shims but we had it laying aro
Electronics Forum | Mon Jun 18 10:11:52 EDT 2007 | dyoungquist
Almost every board/panel we build is double sided and we use an MPM SPM screen printer with no problems. The screen printer is not the cause. We have seen heavier parts fall off the first side when going through the reflow for the second side. We
Electronics Forum | Wed Jun 20 13:50:52 EDT 2007 | rgduval
Dominic, I guess it would depend on criticality and volume. We do mostly low volume builds here, and the only time I do a solderability test is when we encounter an issue during production. That process works for us, considering the volume of the