Electronics Forum | Thu Apr 19 11:03:42 EDT 2018 | dleeper
When your stencil foil looks like cooked bacon it's time to replace it.
Electronics Forum | Thu Apr 19 10:32:41 EDT 2018 | emeto
Hello experts, what would you recommend as a standard practice for stencil replacement? I am having here a stencil from 2004 that is worn out enough and has a small dent on the image, but still have to prove why I want to change it.
Electronics Forum | Fri Apr 20 07:41:19 EDT 2018 | stephendo
Show that it is cheaper to replace than to make bad boards that need rework. Surely you can get QC to complain about the boards pasted with that stencil.
Electronics Forum | Thu Aug 16 00:41:03 EDT 2018 | smt2020
Hey man, can you please suggest what you do for traceability system to count cycles of the stencil. Is there any special setup for that or just a Excel sheet with formulas.?
Electronics Forum | Thu Aug 16 07:56:54 EDT 2018 | cyber_wolf
Never heard of any traceability requirements for stencil cycles. The SPI machine should be the judge of how your print process is performing.
Electronics Forum | Wed Aug 22 10:08:28 EDT 2018 | emeto
If we don't take SPI machine is given in the equation, another control should be put in place. Buckcho your approach is interesting, but requires a lot of effort. Do you guys think the stencil printer can count the prints for the same program? Or eve
Electronics Forum | Fri Apr 20 03:04:24 EDT 2018 | tsvetan
We usually replace stencil when we start to get problems with the solder paste printing i.e. uneven solder paste deposit etc. Until then it doesn't matter how many years ago it's manufactured, but how many prints it passes and if the operators didn't
Electronics Forum | Fri Aug 17 01:49:51 EDT 2018 | buckcho
Traceability can be made for many things. It is up to the factory and what it wants to implement. You can have traceability on the stencil for a several reasons: 1. Want to check stencil cycles 2. Want to verify if stencil is the correct one loaded 3
Electronics Forum | Wed Aug 22 10:28:19 EDT 2018 | buckcho
I have the same machines, haven't figured it out yet. Only idea i got is to scan every batch and get a rough number of the prints. For example if you have an order of 500 panels, usually it would take 500prints to produce them (maybe 4-5 differences
Electronics Forum | Fri Aug 17 06:29:41 EDT 2018 | cyber_wolf
Correct stencil, wiping frequency effectiveness,and correct paste deposition are all verified by the SPI machine. I suppose you can put all kinds of things in place, but you may want to determine what is practical and "why?" are you doing it. Trac
