Electronics Forum | Wed Mar 19 19:02:39 EST 2003 | Jodi Roepsch
From my experience, we have had little success in reworking boards with the black pad condition. In one instance, with several reworks, we were able to get plated through holes with the defect to take solder but the joint reliability was highly ques
Electronics Forum | Thu Mar 20 14:11:45 EST 2003 | MA/NY DDave
Hi Guys, There are techniques to do rework that involve molecular surgery even when selective, ablation and piles of localized techniques exist yet the cost is far too high and scrapping is mostly a best cost manufacturing alternative. At the cost o
Electronics Forum | Thu Feb 13 10:38:51 EST 2003 | davef
Given that you are bridging front to back, contast the situation with the thiefs used to prevent bridging when wave soldering SOIC. If this is reasonable, the thiefs should be located behind the trailing connector pins. You can prove-out this [and
Electronics Forum | Wed Feb 12 14:33:09 EST 2003 | Ehess
We are in the process of settign up an SMT line with conveyors. When planning for a 4ft conveyor (or 2 or 3ft for that matter), how mush space should I set aside for this? My boss is telling me to leave 4'6" for a 4ft conveyor. I think this is too
Electronics Forum | Wed Feb 12 16:20:01 EST 2003 | vortex
4'2'' should be enough, going any higher and your bound for large gaps between machine and conveyor. Its been awhile since I set any up but i'm sure that 4'2 will be enough but not too much. I'm sure I wrote down my exact measurments, if I come acros
Electronics Forum | Wed Feb 12 17:10:02 EST 2003 | Mike G
Most conveyors are sold by the inch. I allow for no more than one inch gap between the end of the conveyor and the next piece of equipment. If you trust your measurements, 1/2 inch is best. This will allow for the smoothest transfer possible of small
Electronics Forum | Wed Feb 12 18:41:39 EST 2003 | russ
I'm with Mike G, We use a 1/4"(1/8" gap on both ends)! We process very short boards from time to time and any more space causes transfer errors. Also, the very short gap helps alot when lining them up. Russ
Electronics Forum | Fri Feb 14 17:42:11 EST 2003 | dgjjr
I would agree on keeping the gaps to a minimum but make sure you have enough maintenance access to the pick and place and oven. Pulling a conveyor out with an 1/8th on either side is no fun. Same goes for bolting to the floor, make sure you can unb
Electronics Forum | Wed Feb 12 20:13:39 EST 2003 | cmiller
Does anyone have any experience with setting up a nitrogen supply system to a wave solder machine that is equiped for it? Does the nitrogen need to be room temp or higher? Does it make a big difference with bridging or solder quality? We bought a use
Electronics Forum | Fri Feb 21 10:31:48 EST 2003 | adlsmt
We dont have the debridging knife. I had one on an old Hollis machine I had once. It was totally worthless. I am setting up the nitrogen today. I will let you know how its goes. We are using a water based no-clean. The nitrogen will probably make a
