Electronics Forum | Thu Oct 30 15:07:40 EDT 2008 | jemills
Hello I have a new 0402 pad design on a recent board were building in future. On closer look i thought the pad was a thru hole mount , but upon closer inspection the round pads are for 0402 comps. I had a discussion with the engineer and he said
Electronics Forum | Tue Jun 05 16:40:46 EDT 2001 | kerryn
Thanks Phil. However, my objective is to identify stencils that are not 100% clean prior to sending to inventory. I want to catch it before the solder paste has a chance to dry and harden in the apertures. Kerry
Electronics Forum | Fri Oct 14 14:09:19 EDT 2005 | bschreiber
Your problem is not the 0.4 pitch. Your problem is the manual cleaning. Manual cleaning will only remove the solder paste from the surface of the stencil. What's more, manual cleaning will force additional contamination into the 0.4 pitch apertures
Electronics Forum | Tue Jun 05 20:45:54 EDT 2001 | davef
So, yer lookin' to detect a ~25um glob on the wall of the aperture on yer stencil, eh? Why not wash your stencils before you put them away? That's what we do. Give 'em a quick looksee, then rack 'em, if they're clean. Give 'em anudda looksee befo
Electronics Forum | Tue Jun 05 13:23:27 EDT 2001 | kerryn
We are a high-mix/low-volume operation and end up cleaning 40 - 50 stencils per day. Does anybody know of an automated inspection system or "scanner" that can check a stencil for cleanliness?
Electronics Forum | Tue Feb 26 00:55:55 EST 2008 | elias67
Bill, Is your system the ScanCad system?
Electronics Forum | Mon Feb 18 11:31:02 EST 2008 | davef
Print paste through the new stencil with a piece of mylar [or other clear plastic sheet about the thickness of paper] between the board and the stencil. Dispose of the mylar according to local practice after confirming proper aperturation of the sten
Electronics Forum | Mon Feb 18 09:39:21 EST 2008 | swag
We do like Chunks says only a little bit different. Our stencil supplier e-mails us a "confirmation PDF" before processing any order. If it's a simple board, I just make sure all the apertures are there by comparing to board. If it's got a ton of
Electronics Forum | Wed Feb 20 19:59:10 EST 2008 | pnguyvu
An experienced stencil designer suppose to check gerber data before making stencil it take 5 minutes to do this easily in computer after that analyze components if there's any critical parts in order to modify the aperture at USA STENCILS INC we have
Electronics Forum | Mon Feb 18 13:54:38 EST 2008 | bschreiber
Most stencil manufacturers use an automated stencil inspection system like our StencilScan AOI that compares the Gerber data directly to the stencil image. We provide the StencilScan AOI system to end users that wish to guarantee stencil / screen an
Our Company handle AOI (Auto Optical Inspection) and SPI (Solder Paste Inspection) Machines.
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