Electronics Forum | Wed Jun 13 16:09:28 EDT 2007 | rgduval
The parts were soldered in place on the first side. Any recommendations on material for this kind of fixture? I've shimmed boards off the belt before with titanium wave plows...but, I'd love to find something slightly more elegant.
Electronics Forum | Fri Jun 15 08:53:02 EDT 2007 | ed_faranda
I remember seeing that formula, but looking through my notes, I can't find it. My R&D group is starting to bigger and bigger parts on the bottom side. Could you please email or post that formula?
Electronics Forum | Wed Jun 13 14:48:48 EDT 2007 | rgduval
Is there a sort of standard method to prevent part loss in reflow? I've had a couple of situations come up recently where we've lost some parts during second-side processing. We're running an Heller 1800, with a mesh belt. Most items process fine,
Electronics Forum | Wed Jun 13 15:56:35 EDT 2007 | ck_the_flip
I experienced this with a high-mass capacitor. I was able to turn down the bottom-side convection (around 50�C lower than each of the top-side heaters), and able to NOT lose any parts. I got the bottom-side part just slightly over liquidus, and min
Electronics Forum | Thu Jun 14 04:08:33 EDT 2007 | d0min0
we had same problems with heavy loaded boards (40 x 10 leg transformer each side) we placed 2 glue dots (Fuji GL)under trafo and played with profile bottom side (thermateh lcv4 - 6 zones, SnPb process) that did the trick
Electronics Forum | Thu Jun 14 11:26:30 EDT 2007 | mumtaz
It may be your screen printer my friend. You are using a MPM aren't you? I knew it. Try a DEK to rid yourself of these pesky problems.
Electronics Forum | Sat Jun 16 08:40:23 EDT 2007 | davef
Search the fine SMTnet Archives, for instance: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=43869
Electronics Forum | Mon Jun 18 10:11:52 EDT 2007 | dyoungquist
Almost every board/panel we build is double sided and we use an MPM SPM screen printer with no problems. The screen printer is not the cause. We have seen heavier parts fall off the first side when going through the reflow for the second side. We
Electronics Forum | Wed Jun 13 15:40:44 EDT 2007 | slthomas
Edited because I completely misinterpreted your post. We used 2 lengths of Durapol with slots for the board edges and a shorty (free-floating, not attached) under the middle. Not much more elaborate than your titanium shims but we had it laying aro
Electronics Forum | Tue Oct 05 13:43:58 EDT 2004 | cyber_wolf
Try this goofdaddy out. http://www.reflow-ovens.com/
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