Electronics Forum | Mon Mar 07 20:27:07 EST 2005 | KEN
Oh silver and its...improved solderability over tin / copper. BS if you ask me. Look to your flux and thermal profile for wetting spread. Ask yourself just how much "wetting spread" do you need to fill a barrel? I have the same 100% barrel fill
Electronics Forum | Wed Apr 20 18:13:32 EDT 2005 | greg york
With twenty five machines working with the LFB227/S on our little island it does seem to work well. Wetting is good compared to Tin/Copper and flow is comparable to 63/37. Biggest problem sticking 3 - 4 % Ag in a solder ignoring the patents and royal
Electronics Forum | Mon Mar 07 22:20:56 EST 2005 | rf
I'm doing some research into some various costs for defects and work stoppages in an SMT environment. Specifically, I'm interested in what are the costs for a company to rework defective boards...from easiest to hardest component but not to include c
Electronics Forum | Thu Mar 10 15:10:07 EST 2005 | bandjwet
In reviewing the myriad of BGA reliability tech papers there seems to be little commonality in the type of test protocols. There are tests that are industry specific, device vendor specific and customer specific. What guidance in terms of minimum me
Electronics Forum | Fri Mar 11 09:28:34 EST 2005 | Micheal
I need help on a Quad IVC. We are having intermitant problems. What happens is it runs and then all of a sudden the Z goes down into the feeder past the limit. I have changed the Z motor, cleared the memory, and also swapped motion controller boards
Electronics Forum | Fri Mar 11 11:58:55 EST 2005 | pjc
About $60K for a good bench-top unit and $120K for a good in-line. AOI is justified if you are spending a lot of time ($$) visually inspecting your boards. AOI machine is faster and more reliable than a human for this task. Plus, visual inspectors d
Electronics Forum | Mon Apr 25 22:56:44 EDT 2005 | davef
rush316 First, no one stated that PBB and/or PCBE are in FR4. FR4 contain tetra-bromo-bisphenol A [TBBA]. Second, there are classes [and grades] of dielectric materials used in fabricating printed circuit boards. Grades, NEMA LI-1. From these gr
Electronics Forum | Tue Mar 15 19:17:26 EST 2005 | yoman
Thanks for your reply. We are using EKRA E4 Inline Automatic Stencil Printer. It is Capable of Automatic stencil inspection. 2D solder coverage inspection. Fix Squeegee angle at 45 degees angle. Programmable squeegee speeds and pressure, boards snap
Electronics Forum | Thu Mar 17 10:14:30 EST 2005 | davef
If you're washing the boards properly, you should see any problems, maybe a little extra floaming, but that won't be too bad. If you're running no clean, you need to aplly flux according to your supplier's recommendations. If you decide not to foll
Electronics Forum | Fri Mar 18 10:18:35 EST 2005 | That's Mr. SMT-Tech to you!!
Here's a good one!!! I've got a customer who is designing a small circuit board, and they want to reflow BGA solder balls directly to the bottomside of the PCB to effectively create a BGA style interface between his PCB and another PCB. Anybody ever
