Electronics Forum | Fri Mar 10 14:15:11 EST 2000 | Doug Kennedy
Russ, I still don't understand where you're coming from! The chipmaster is a closed loop system...it has a thermal couple. Also, I've got profiles on mine! If you're having problems with a loose nozzle just tighten the four set screws in the bl
Electronics Forum | Fri Feb 25 04:28:49 EST 2000 | Sze-Pei LIM
We faced terrible void issue while using Sn96.5Ag3.5 solder paste, more than 20% void. We tried adjusting the reflow oven profiles but we did not have much success in reducing the void. Generally, we find quick preheat, high peak temp. and fast cooli
Electronics Forum | Tue Jan 30 14:59:07 EST 2001 | MikeF
I thought Contact Length refered to the travel distance the board stays in contact with the solder. I measured it using a tempered glass plate that also showed me if I had an even footprint of contact with the wave. By this definition, conveyor spe
Electronics Forum | Wed Feb 28 19:48:11 EST 2001 | davef
If we were talking about a single board problem, we�d be thinking about the laminate, but since you imply the problem is broad-based across multiple assemblies, consider the following machine parameters: * Crank-up preheat time / temperature to driv
Electronics Forum | Mon Mar 12 13:08:17 EST 2001 | johnwatt
Daniel, what type of wave set up do you have ?, are you rnning a chip wave and what are your preheat's / fluxes that your using. One thing I was wondering is at what angle your running onto the wave, perhap's you PGA is shadowing your components in
Electronics Forum | Tue Sep 19 14:40:13 EDT 2000 | Erick Russell
It is always a good idea to heat the entire board to 100C to 140C prior to reflowing the site to be reworked to reduce warp and localized stress. (Thermal uniformity of the preheater is key here). For a BGA, the laser is programmed to heat only the
Electronics Forum | Mon Jun 25 20:50:33 EDT 2001 | davef
If your solder paste has forsaken the pads and gone to all the work of climbing the leads, it�s because the leads are much warmer than the pads. Some like it hot!!! We talked about this on SMTnet within the past 6 months. Please check the archives
Electronics Forum | Mon Jun 25 10:35:39 EDT 2001 | rkevin
Despite all my efforts I cannot eliminate icycling on my t/h leads. They come and go.... daily, lots of rework. I have eliminated the following from the scenrio: Inadequate flux to promote quick drainage, Pot temperature too low, Soldering surface
Electronics Forum | Mon Jun 25 11:26:36 EDT 2001 | wbu
What about conveyor speed? I tried to manage that the speed of the board and the speed of the wave were nearly the same at that point where the leads are leaving the wave. But actually I haven�t seen icycling except at one time and that was solved r
Electronics Forum | Tue Jan 18 12:36:11 EST 2000 | Dave F
Dave: I haven't located something to support your contention, yet, and I'm not going to comment on the factors that drive reliability beyond component selection, because I know that you've got some sweaty-palmed sales type wringing his hands waiting
