Electronics Forum | Fri May 22 16:16:36 EDT 2009 | pjc
Electrovert's studies for Hot Air de-bridging Knife (HAK) for Pb Free alloys have shown it to be ineffective. When its hot enough to do the job, you're damaging the board, cooling it down to prevent damage is not hot enough to de-bridge properly. Ya
Electronics Forum | Wed Apr 05 22:31:51 EDT 2000 | Dave F
Robert: Out of curiosity, by "BT" do you mean: � Bismaleimide triazine, the stuff used to increase the tg of resins used in some BGA interposers. � British Telecommunications plc, the guys with bad teeth. � BrookTree, the RAMDAC supplier, that�s par
Electronics Forum | Wed Aug 31 10:26:24 EDT 2005 | Carmichael
I respectfully disagree with vapor phase or reflow oven being the technology of choice here. Have you considered straight conduction heating? (ie: hot plate) If you have a lot of these to do you can purchase in-line conduction ovens like the Sikama o
Electronics Forum | Tue Jul 28 02:22:59 EDT 1998 | Bob Willis
Here is what I would do faced with your problem. First I would profile a similar board or use an existing profile. From there I would place the dummy device on the surface of a sample board with a thin thermocouple soldered to the board surface under
Electronics Forum | Tue Nov 13 00:05:11 EST 2012 | eadthem
Typical problems with our heller 1707 EXL would be blower issues. We have almost replaced every blower on the top sense purchase. Fortunately Heller is very good about honoring there warranty on the blowers which is quite long, Might be lifetime not
Electronics Forum | Fri Feb 24 10:33:13 EST 2006 | MikeL
I know what you mean. Saw this in systems where cooling was not done through the reflow nozzle (i.e. PACE). What happens is that as you run 1-2 profiles, the metal parts along the pathway of the hot air (before it comes out of the nozzle) act as he
Electronics Forum | Wed Jan 02 09:24:00 EST 2013 | swag
Thanks for the help. Ramp soak spike but due to the density of this assembly it's more like ramp spike. Yes, leaded. I'm getting similar results with or without the carrier. (I designed the carrier like swiss cheese, full of holes and scallops on
Electronics Forum | Wed Dec 09 21:45:11 EST 1998 | Dave F
Graham: I agree. Very thorny. What is clean?? And how is that controlled?? Back 25 or so years ago, soldering was done with high solids rosin fluxes. The issue with cleanliness was ionic contamination. The US military and others set a fairly a
Electronics Forum | Mon Sep 23 16:13:42 EDT 2002 | robf
Isn't this a blatant violation of rules? Couldn't Bill have e-mailed a response directly to the poster? I'm not sure if acts like this frustrate users that actually are the people who work in this industry but it definately frustrates suppliers who
Electronics Forum | Tue Oct 11 18:35:59 EDT 2005 | stepheniii
How big a tank do you have at the compressor? Basically the bigger the better. You will still have the same duty cycle ratio but the compressor won't be cycling as fast. Hopefully someone here knows what a good size would be. And when you say "kic
