Electronics Forum | Fri Jan 06 18:20:01 EST 2017 | sarason
AS wonderful as your experiment in 3D printing is. WOuld you have been better off taking a print feeder roller out of an inkjet , with the right diameter and cutting to size on a dropsaw! Another approach is to find a supplier in the printing indust
Electronics Forum | Thu May 25 18:32:12 EDT 2006 | pms
Having an issue with our paste inspector (human type). Were printing paste on .5mm pitch pads (MLF package). My question is - What is the acceptable print deviation (percentage) off the pad before you see problems after reflow? 0%? 1%? 10%? 25%?
Electronics Forum | Thu Mar 22 05:32:07 EDT 2018 | rob
Also, get your PCB suppliers to send you BBT failures that they would usually throw in the bin. In addition to print testing you and use them for profiling. We use a sticky film for print testing, then wipe, peel off and throw in the bin.
Electronics Forum | Thu Jul 19 08:00:03 EDT 2001 | doctord
Solder balls or mid chip beads? Remember IPC classification for Class 2 allows mid chip beads encapsulated in flux. Usually on R's and C's first thing I would do is verify .006 laser stencil 10% reduction and the most critical, The paste must be on t
Electronics Forum | Fri Oct 28 08:37:06 EDT 2005 | pavel_murtishev
Once again, it isn�t the process problem. It�s machine problem. I�ve tried to change all of the parameters: printing speed, printing pressure, snap-off speed, snap-off distance, etc. No any effect. Defect still exists with different process parameter
Electronics Forum | Sat Nov 22 09:51:51 EST 2008 | realchunks
You need to take it a few steps farther. The main reason you would want to reject a certain % off print is because it made defects. So you need to see how far you can go without creating a defect and then establish that as your cut off and the need
Electronics Forum | Mon Aug 15 10:07:21 EDT 2016 | capse
In screen printing the material is transferred through openings in the screen mesh. You can imagine small columns of "ink" that coalesce after the screen releases. Screen printing is also an off-contact process verse contact process of stencils. The
Electronics Forum | Mon Aug 18 15:18:08 EDT 2008 | realchunks
Open the same size as the via's anular ring. Any slight off print will wet its way back into the via hole.
Electronics Forum | Thu May 31 02:48:49 EDT 2012 | leeg
Does anyone use an excel spreadsheet to monitor and show via a control chart their paste height check data and if so would they have a copy that I could use as a template? We have a spreadsheet that we use but print it off and fill the data in, I am
Electronics Forum | Thu May 04 13:42:47 EDT 2023 | wippsen
there is no reason to completely clean a circuit board. If you don't use a professional cleaning machine, you will always have leftover paste. Use a test board until the paste print is ok. You can wipe this off several times until the paste print is
