Electronics Forum | Tue Oct 22 13:11:07 EDT 2002 | slthomas
After considerable hemming and hawing, we decided to drop the bomb on 'em....give us ORL0 (which we use here) AND no bottom side solder balls or belly up to the bar with some favorable Appendix B test results on their preferred flux. As usual, Mr. F
Electronics Forum | Tue Mar 11 11:22:38 EST 2003 | slthomas
Is a water-soluble flux based paste an option for the bottom side? Then you could wash the residues from the board before wave. That's the only way we've tried that process. The difficulty we had was with some disturbed joints, apparently from s
Electronics Forum | Thu Aug 07 19:48:23 EDT 2003 | Shawn
We do allot of multi layer boards with heavy ground planes or heat sinks attached. We have a Trieber, use RMA flux, solder pot temp at 500F, foam fluxer, spray the top if need be, and would warm up the PWB to around 240F over the preheaters. We have
Electronics Forum | Tue Jan 27 04:27:59 EST 2004 | loz
Thanks Dave, sounds totally plausible. In answer to Pete B's questions 1. Spot mask IS only being applied to earthing points, top and bottom side. 2. Unsure. Speaking to manufacturer they are telling me it is compatable. However data sheet is vague.
Electronics Forum | Wed Feb 18 12:32:59 EST 2004 | babe
A hot plate should do it. Since your throwing the board away a good hot plate could get you to just above reflow topside and you could remove them all at one time. To do this however the bottom side of the board would probably be damaged, but you don
Electronics Forum | Fri Sep 16 13:03:11 EDT 2005 | james
We current use glue on our bottom side boards using stencils and screen printers. Our Glue aperatures that we use are very small rectangles and they seem to clog very easily. We currently are using Heraeus PD955PR #8 and see alot of boards that ar
Electronics Forum | Wed Dec 21 11:49:50 EST 2005 | dlkearns1
We have small blisters all over the bottom side of a heatsink the measures apprx 4" x 12", flat surface. Is there any chance someone can refer me to some standard or specs for usability, personally I think these little blisters would be ok and not in
Electronics Forum | Wed Jan 18 10:35:17 EST 2006 | pms
Thanks folks !! I'll experiment with the bottom side heaters. Unfortunatly I don't think our Vitronics-Soltec oven has the option for adjusting the heater fan speeds. And I'll check the conveyor chains. This is our first project using 0402 parts, wh
Electronics Forum | Wed Jun 14 21:56:07 EDT 2006 | davef
Stencils should be cleaned frequently enough to ensure total removal of any bottom side residues, but not so infrequently as to allow the same residues to dry or cake on, making their removal much more difficult. Look here: http://www.smtnet.com//fo
Electronics Forum | Fri Jun 09 07:26:24 EDT 2006 | amol_kane
hi, gald to hear that yr process is working well.....we are in the process of buying a wave with SN100C solder.....any pitfalls/precautions that you took during the transition? did you do any DOE for setting up the profile values?? are you seeing a
