Electronics Forum | Sun May 09 16:25:00 EDT 2004 | gabriele
Military and most commercial standards requires > post-soldered boards to measure less than 10 > �g/in of NaCl (14 when using an Omegameter, 20 > on a Ionagraph, and 37 on a Zero-Ion). > > As Dave > stated, 6.5 �g/in of NaCl is called out in >
Electronics Forum | Tue Dec 17 18:44:13 EST 2002 | davef
Two suppliers of singulation machines are: * Wand 847.459.2400fax2421 * Circuit Technology 847.705.2140fax2141 Search the fine SMTnet Archives for additional discussion. Also, look here: http://www.assemblymag.com/execute-vSection-Articles-vSu
Electronics Forum | Fri Jan 24 22:22:26 EST 2003 | MA/NY DDave
Hi Entering just to keep this tread alive, and see more comments. Yes I have seen a serious decay over many years. In addition to the supplier side getting worse, incoming inspection, receiving seems to be getting worse. In addition to the decay
Electronics Forum | Tue Jan 21 11:11:07 EST 2003 | slthomas
OK, so the issue is with the variability of the alloys on the soldering surfaces and the subsequent variability of reflow temps. Sounds reasonable (actually obvious, now that I think about it), especially on the component side. We only use HASL fin
Electronics Forum | Fri Feb 07 15:17:14 EST 2003 | MA/NY DDave
Hi I am pretty sure it isn't the pad that is causing the problem. To me it seems like those via holes through the pcb either to an internal plane or to the other side. I can imagine creating an interesting stencil to accomodate the vias yet you are
Electronics Forum | Sat Feb 22 11:27:16 EST 2003 | stefwitt
In the early days of SMT we were using vibratory bulk feeders for chip components. It was quite obvious that some of the components had to try several times getting through the gravity trap or with the right side up through the light sensor. As a res
Electronics Forum | Mon Feb 24 16:01:15 EST 2003 | MA/NY DDave
Hi Claude and the next person gave some good advice I would follow. When I spoke above about vibration I was thinking of machine, transport and other, yet shock like tapping the board on it's side or otherwise is pretty much the same. You create mic
Electronics Forum | Sat Mar 01 08:17:40 EST 2003 | davef
You're correct that the FR4 is probably the best choise. The majority of the problems in developing your reflow recipe is going to come from the CTE mismatches in the CCBGA , CBGA and PBGA that you put on the board. The other side says given the pr
Electronics Forum | Fri Feb 28 13:09:49 EST 2003 | russ
Check out out hot bar equipment, we used to do this with very good results. I am sorry that I can't remember the manufacturer to help you check into this. If you are not familiar with this here is the process in a nutshell, place assy and connector
Electronics Forum | Tue Mar 04 14:38:57 EST 2003 | caldon
I am doing some work for a company that does it's own Manufacturing. They want to make their services available to the out side world. To do this they want to bring in a sales engineer as an Independent Contractor. 100% Commission and no Benefits. Wh