Electronics Forum | Thu Nov 04 14:13:34 EST 1999 | John Thorup
Hi Tim It sort of depends on the solder alloy being used and the particular assemblies being soldered. If you are using the usual 63/37 alloy I would consider 500 to be a bit warm unless the assembly required it. Some alloys would require a higher
Electronics Forum | Tue Nov 09 10:35:02 EST 1999 | WilDaly
Tim, I try to get 2-3 degrees C/sec (bottomside) rise on my boards through wavesolder. I like to get the topside to about 90-95 degrees C, but this is the optimum temp for the flux that I am using. To fast of a slope and you will burn your flux of
Electronics Forum | Tue Nov 02 08:57:36 EST 1999 | Kevin DuCasse
This is our first time out processing material with a finished thickness less than the standard 0.062 FR-4 material. We have an assembly that uses GIL MC5 with a finished thickness of 0.035 and we are having difficulty at placment with the array "bo
Electronics Forum | Thu Oct 28 11:22:50 EDT 1999 | Jeff Ferry
SMTneters, I'm conducting a workshop titled "Circuit board repair on the Internet" at our California facility on November 10. Similar to a recent posting, I'm seeking suggestions for online resources to discuss with the attendees. In addition to
Electronics Forum | Mon Oct 25 22:27:53 EDT 1999 | SaiWong
I have two of the servo boards of the Fuji CP4-2 SMD3 version are mulfunctionaled. I don't know if it can be fixed or not. May be the moisture killed the board. A new one costs about USD 5,000 each. I wonder if anyone knows who or which company can
Electronics Forum | Wed Oct 27 10:22:15 EDT 1999 | a.blair
Fuji is usually the cheapest you will find. I think around $750 for them to repair it. the last time I checked they have an exclusive patent on their PCB backplane design so there would not be any real way to bench test it. they also have rights to t
Electronics Forum | Mon Oct 25 16:12:52 EDT 1999 | Joe
Dave: Thanks for the info, I appreciate it. You start off by naming a +/- 2 sigma process, is that equivalant to an AQL of 0.25 ? What is a 6 sigma equivalant to? You mentioned the AQL at incoming inspection, what should that be in relationship to
Electronics Forum | Mon Nov 08 09:30:15 EST 1999 | John Burris
I just wanted to thank all of you who responded via e-mail to me regarding this subject. After a lot of looking and talking, I decided to keep using Unicam. I'm working on adapting my use of UC to fit my process a bit better, and hopfully, more effic
Electronics Forum | Fri Oct 22 11:37:38 EDT 1999 | Brett Gordon
Working DFM SMT issues with respect to a client's artwork together with a heavily modified solder stencil, I was able to reduce 0402 tombstoning from 80% across the board to 3%. I winged the aperture reductions, but are there any "rules" or guidelin
Electronics Forum | Thu Oct 21 11:32:15 EDT 1999 | John Thorup
Larry Elaborating on the specific question, yes, the volatile solvents in the flux can and will evaporate. Evaporate completely in any reasonable amount of time? Probably not. What tends to happen is that the exposed paste dries on the surface and
