Electronics Forum | Sat Feb 16 07:21:17 EST 2019 | SMTA-Joe
I am experiencing a "tarnishing" issue on PWB traces that may be causing problems with component reflow. The PWB traces are made to the following spec: SOLDER MASK OVER BARE COPPPER WITH SILVER IMMERSION PLATING PER IPC4553, PLATING TO BE 8-12 MIC
Electronics Forum | Sun Feb 17 17:55:21 EST 2019 | davef
Each time that you cook imm surfaces, you give-up coating thickness. Spec IAg can take maybe 4 thermal cycles ... [that's what I remember but those could be PbSn, not SAC cycles]. Anyhow, the more that you decrease coating thickness, the more that Cu
Electronics Forum | Mon Feb 18 09:25:20 EST 2019 | davef
It doesn't matter if the traces have solder or not. We're talking thermal cycles. RE IAg thickness: I believe the IAg is a self limiting process, similar to IAu. Your fab may be able to help a little, but I don't expect a substantial change. And if
Electronics Forum | Tue Feb 19 10:50:13 EST 2019 | rgduval
Call Heller directly, and give them the oven, and relative thermal density of the board, as well as the solder paste that you're using. They'll be able to give you a baseline profile to start from (both RTS and RSS). Otherwise, use a thermocouple p
Electronics Forum | Tue Feb 19 12:28:26 EST 2019 | slthomas
Presumably you're talking about lead free, but you don't say. Heller can probably provide you with a starting point, as rob has already pointed out, but you do need to develop the capability to perform profiling yourself. That oven should have ECD
Electronics Forum | Wed Feb 20 11:40:31 EST 2019 | bmalhi
Heller Oven comes with a profile pre-loaded so you can start there. RTS = Ramp to Spike. Basically a straight line from preheat to spike. Also known as “Tent” profile RSS = Ramp Soak Spike. This one creates a flat line around 150-180 degrees on th
Electronics Forum | Wed Feb 20 01:17:48 EST 2019 | jbuivydas
Hello, Here is the situation: A colleague is working as a production process supervision technician in the factory. He uses program called " Board explorer " and after changing the computer to a new one the license he had no longer works. A temporar
Electronics Forum | Thu Feb 21 05:34:21 EST 2019 | reckless
I have 2 older genesis machines currently down due to VRM Servo issues. I'm debating whether its better to stock up on some spares as I'm finding spares cheap currently. How often do they go out and how long should they last? Any other parts that
Electronics Forum | Fri Feb 22 13:55:27 EST 2019 | bruce_mackean
Is there a need for a simple application to merge a bill of material with the xy placement data into a single (or top/bottom) files for machine programming? ie. add a part number column to the xy data, including "N/A" for parts not found in the BoM?
Electronics Forum | Sun Feb 24 09:13:38 EST 2019 | spoiltforchoice
Look on this forum for a link to SMTMaestro which does just that. Fab3000 is almost there with its BOM tools and has a bunch of handy features, its just that they have not considered this use case instead focusing on recreating the centroid from gerb
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