Electronics Forum | Tue Oct 08 20:06:03 EDT 2002 | peterson
What is the procedure for insuring that our solder is not contanimated in our wave solder process if we switch between water soluable and no clean solder. We switch between the two types on the same machine during consecutive shifts. Should the entir
Electronics Forum | Mon Nov 04 10:14:49 EST 2002 | blnorman
We manually handle boards all the time (repair, clean misprint solder paste, etc.). The workers know to handle with gloves, but it's a rarity that they do. We also use hand lotions in the plant, and a couple of times, lotion residue has shown up on
Electronics Forum | Mon Nov 04 14:45:01 EST 2002 | erikb
As a rule handling PCB's with bare hands is acceptable provided that there is sufficient esd protection as well. It is a good rule of thumb however to provide your inspectors or assembly people with finger cots or cotton gloves to keep the product cl
Electronics Forum | Tue Nov 19 15:08:45 EST 2002 | steve
Be careful, if you are using a water soluble chemistry then your pre-forms that are impregnated with flux may dry out prior to use. If your using a no-clean application then ther should be no worries. Aim solder out of Rhode Island is very good with
Electronics Forum | Fri Dec 06 13:00:29 EST 2002 | daanterstegge
I wouldn't recommend a metal squeegee, because if you can't wipe the step-etched area completely clean (that's the problem with metal) you'll have problems with the definition of the fine-pitch (it may stick in the holes). Best is a 70 Shore polyuret
Electronics Forum | Mon Dec 02 16:01:15 EST 2002 | russ
If you can, attach athermocouple to the locations where you are getting solder balls. A previous product I had showed the same thing and we found that we had inadequate preheat leaving the liquid flux to splatter when it hit the wave. It could aslo
Electronics Forum | Thu Dec 05 17:45:31 EST 2002 | Gris
Hi, Is the limit for " 10.07 " for assemblies ? I guess we need to calculate how much ionic residue the boards see after assembly and cleaning. and then calculate back to the board spec if i am not mistaken ? For bare fabs we have to access the li
Electronics Forum | Thu Dec 12 10:54:57 EST 2002 | russ
I have had both success and failure with immersion tin. It seems to be very dependant upon the PCB suppliers process control. If its too thin, solderability is greatly diminished. I have never had it too thick (see Daves comments). We currently d
Electronics Forum | Sat Dec 14 10:10:04 EST 2002 | davef
This is a good idea. Heck, you could fill the bags with sand, if you wanted. Like anything else in the shop, bean bags require attention and maintenance. If you don't, eventually the seams on the bags loosen / break and you have to do a "clean-u
Electronics Forum | Tue Dec 17 08:46:59 EST 2002 | Randy Villeneuve
Personaly I would try a different solder paste. Give Indium a call and get a sample of their SMQ92J No clean. You will be impressed. Alpha and Kester also have good products but we have a long history with this paste and we have printed millions of b
