Electronics Forum | Thu Nov 19 05:25:07 EST 1998 | karlin
| | We are experiencing 'lifting' on one or more sides of a QFP. Poor lead co-planarity has been ruled out by independent tests. Please tell me which of the two remaining failure modes is the most probrable? | | | | 1. Expansion of gases in vias und
Electronics Forum | Sat Apr 24 08:23:03 EDT 1999 | Bubba
| Surprisingly enough, ever since the addition of an omega wave, we solder those often-troublesome SOT23's just fine and dandy.. anyways, long-term, well be getting a universal GDM which uses positive displacement pumps..currently we're using fuji g
Electronics Forum | Tue Mar 01 08:59:39 EST 2005 | Marc
Morning All Attended APEX this year and this quesiton came up quite a bit from users. I had some conversations with my co-workers on the wave side and others at the show. Dross is an oxide, lighter than the metals so it floats just as pmdeuel st
Electronics Forum | Thu Jun 08 16:33:47 EDT 2017 | sumote
This may not be a solution to your problem, but something from my tuner car days jumped into my head. If you are running at 100% and not getting the height you need, change out one (or both) of your pulleys. A bigger pulley at the motor side, or a sm
Electronics Forum | Wed Nov 10 11:31:06 EST 1999 | John Thorup
Hello Horace You're lucky in that you have two of the same machine. You should be able to arrive at the root of the problem by comparison. The problem is likely to occur in one or more of these areas: MACHINE: As said , pump speed and air contact ar
Electronics Forum | Mon Jun 05 18:50:10 EDT 2017 | caurbach
Hi Zac, My 2 cents: We had similar problems on a board in the same situation (tin-lead HASL, very long leads, low pot height, high pump RPM). Trimming the leads shorter, moving the pot closer to the board, and dropping the pump speed down to sane
Electronics Forum | Wed Jun 01 19:31:03 EDT 2016 | marcelll
Strange problem with a Versaflo selective wave Very long for the pot to reach is set temperature ( 5 h ) At 180 C, the pump doesn’t seem to start like it should be So very long to heat the bottom of the pot Finally, the bottom element is turning on
Electronics Forum | Tue Feb 27 18:16:42 EST 2001 | davef
I have never seen excess tin [heard of it, just never seen it]. Excess lead yes, but tin no. See, tin oxidizes faster than lead. This means that dross has a higher tin content than the solder in the pot. So, with a very high dross machine, we regul
Electronics Forum | Wed Mar 16 17:34:20 EST 2005 | pmd
decrease pump rpm, for penitration try tweeking pitch as well as belt speed. On the delta wave spray pitch and belt speed are related.
Electronics Forum | Tue Dec 12 13:33:52 EST 2000 | justin medernach
Dross removal is dependent upon the "activity" in your solder pot and the usage of a inert or an "air" atmosphere. The more moving that agitate the solder, the more dross. Basics first and then the answers will make sense. What is dross? Oxidatio
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