Electronics Forum | Mon Jun 12 09:08:17 EDT 2006 | Chunks
Hi Grant, Boy, how do I say this - I might have to agree with Wave Master Larry. (Yeah, yeah - I know; Davef and Dr. Shocker will "burn me" again) "We" also solder large thru-hole connectors on with a selective solder machine. They measure 4 by 8
Electronics Forum | Mon Jun 12 09:47:18 EDT 2006 | patrickbruneel
Hi Grant, You definitely have a pre-heat problem and not a flux problem. Pallets together with the BNC connectors put a large thermal demand on your pre-heating. 3 zones would be a good investment even with leaded solder due to the high thermal dema
Electronics Forum | Mon Jun 12 13:49:47 EDT 2006 | grantp
Hi, Thanks guys for all the suggestions. I am going to check what options we have for top side heating. Do people recommend we get convection for that? Also, we seem limited to 60% in the machine setup, and does anyone know how to run the top lam
Electronics Forum | Mon Jun 12 14:16:23 EDT 2006 | Kip the Expert at all Things SMT
Hi. I agree that the Soltec has weak, low-wattage preheaters, and also, the Soltec's fluxer is flippin' weak too. It doesn't do a good jab of atomizing the flux and getting good, huh-huh, penetration on the holes. I cranked up my Soltec's pressu
Electronics Forum | Tue Jun 13 04:20:21 EDT 2006 | Grant
Hi, ok, I have a bit more info after playing further with the profiling. We are getting close, but we don't have enough top side heat I think. The IR lamps just don't give enough, but we can get better connector that should help. But we have anoth
Electronics Forum | Tue Jun 13 09:40:36 EDT 2006 | grantp
Hi, Your right guys, and we turned off the chip wave, and most of the problem went away. It looks much better, and we are getting a slight bridging on a USB connector at the front edge of the PCB and a little adhesion, but not any where as much as w
Electronics Forum | Wed Jun 14 18:07:11 EDT 2006 | grantp
Hi, Thanks for all the help guys, and we did a bunch of things to get it working. We raised the pump speed, and also went to a water based flux, which helped a lot. We also reduce pre heat as we were burning off the flux. It's doing really nice jo
Electronics Forum | Fri Jun 16 15:05:29 EDT 2006 | grantp
Hi, We ran some boards and the girl on the line put in some Pb BGA's instead of using RoHS parts. This should not have happened as we have almost no Pb parts left, and we spray painted Pb parts fluorescent pink so it was obvious. The boards seem t
Electronics Forum | Tue Jun 20 19:15:19 EDT 2006 | grantp
Hi, What are your thoughts about the article saying that the lead will leach out of the solder joint to the last place to cool, creating a weak point? I have two worries about the report. First, is that we have always used tin lead solder, and le
Electronics Forum | Wed Jun 21 07:44:31 EDT 2006 | amol_kane
Hi Muse, what do you mean by "with a SAC Ball and SnPb Paste the ball liquifies at a much higher heat"? Actually depending upon the ratio of solder contributed by the pad (SnPb) to the ratio of the SAC solder contributed by the BGA Ball, the SAC sold
