Electronics Forum | Wed Sep 18 12:35:56 EDT 2002 | stepheno
Fourth - > back to design of PCB. Are there solder dams of > mask between the pads? If yes, that helps. If > not, pay close attention to stencil aperture > width and be sure that the aperture deposits less > paste by 1-2 mils per pad, centered o
Electronics Forum | Wed Sep 18 16:56:55 EDT 2002 | stockley
I started writing a long winded explanation about SMEMA and realised that it is just as easy to write about this as it is to talk about it on the phone. It just so happens that I have recently gone through this process so I believe that your vendor
Electronics Forum | Fri Sep 20 17:41:09 EDT 2002 | davef
Neither. It would be better if the person posting thread said, "I searched the fine SMTnet Archives, but couldn't find an answer to my question. Now, here's what I'd like to know ... " Barring that, it would be better to start a new thread, becaus
Electronics Forum | Mon Sep 23 03:12:01 EDT 2002 | surachai
We encounter this problem also , I know that it 's acceptable per IPC standard but sometime it fail at ICT and FCT , then this problem should be prevent , we found it with QFP 16 mil pitch and the defect looklike negative wetting at the front of lead
Electronics Forum | Wed Sep 25 10:22:21 EDT 2002 | matt2138
UltraSonic cleaners do a good job of cleaning both stencils and misprint PCBs. Make sure the frequency that the machine comes set to is ok to use with both stencils and misprint PCBs. If you are a CM make sure your customers are ok with using the ul
Electronics Forum | Tue Sep 24 19:07:43 EDT 2002 | davef
Why does the person posting need post to the old tread? What can't the new poster just say [words to the effect] Hey yall!!!! I was perusing the fine SMTnet Archives and came across the following thread: http://www.smtnet.com/Forums/index.cfm?fu
Electronics Forum | Thu Sep 26 16:29:02 EDT 2002 | pjc
Because most placement machine mfgs' feeders vary in width sizes its best to get the reference from them. Like how many 8mm slots does their 16mm consume, and so forth. Std. Sizes I've seen are: 8mm, 12mm, 16mm, 24mm, 32mm, 44mm, 56mm, 72mm, 88mm, 10
Electronics Forum | Mon Oct 14 09:31:46 EDT 2002 | russ
First off, are you planning on placing these parts with your placement machine since you mentioned that you do not have an alignment system for rework? I would be leery of handplacing a BGA into paste by steady hand and craned neck alignment. Seco
Electronics Forum | Sat Oct 19 08:14:27 EDT 2002 | johnw
The world of the CM isn't alway's a happy one and the problem is that some one else is alway's paying your wages, that soemone else beign the customer so you really have to do what they say. The board profilign one is a constant one round our place a
Electronics Forum | Tue Oct 22 13:28:03 EDT 2002 | slthomas
Brian, Since the change, I have seen numerous instances of extra zeros being added to numeric values, typically those of 3 (original) characters or more. Case in point, a contribution by our friend Mr. Fish that I have cut and pasted: "The steadfa
