Electronics Forum: dirty stencil (Page 1 of 5)

Re: Pretty dirty pictures

Electronics Forum | Mon Sep 28 13:16:58 EDT 1998 | Earl Moon

| | | Does anyone out there have any pictures (jpeg preferred) of solder paste prints - or know where some are available. It will be awhile before our 35mm camera for our 3D scope arrives and I need some for inspection criteria. I need the good, bad

Re: Pretty dirty pictures

Electronics Forum | Mon Sep 28 11:34:26 EDT 1998 | Steve Gregory

| Does anyone out there have any pictures (jpeg preferred) of solder paste prints - or know where some are available. It will be awhile before our 35mm camera for our 3D scope arrives and I need some for inspection criteria. I need the good, bad, and

Re: SPC on stencil printer

Electronics Forum | Wed Jan 13 20:44:42 EST 1999 | Steve Gregory

Hello Sanjay! The cheap deal I use that Earl spoke of is called a SMarT Measure. It's a depth measuring microscope that uses the same principle of measuring optical focus that the units from Vision Engineering do ( if you've ever looked at any

Re: SPC on stencil printer

Electronics Forum | Thu Jan 14 15:22:14 EST 1999 | Earl Moon

| Steve, | Whoa, take a breath! That was at least a dollar three-eighty answer. I've got to agree that nothing can replace a qualified, concientious operator for assuring quality. When I too worked at a small shop there in SillyCone Valley, my

Re: SPC on stencil printer

Electronics Forum | Thu Jan 14 11:08:29 EST 1999 | Mike McMonagle

Steve, Whoa, take a breath! That was at least a dollar three-eighty answer. I've got to agree that nothing can replace a qualified, concientious operator for assuring quality. When I too worked at a small shop there in SillyCone Valley, my seni

Solder Splash

Electronics Forum | Tue Jun 17 09:24:43 EDT 2008 | rgduval

Could it be from a dirty stencil, rather than from the pick and place operation? We've seen a number of occurences recently with solder balls near some of our fine pitch components...we eventually diagnosed as dirty stencils...excess solder on the b

Components Solder Short

Electronics Forum | Mon Jul 24 08:30:25 EDT 2006 | nodlac

- Dirty stencil transfering paste from the stencil bottom. - Stencil opening (Pad Hole) to pad ratio incorrect - too large -misaligned stencil

pc board defects

Electronics Forum | Fri Sep 13 13:51:38 EDT 2002 | kenbliss

I recently saw an ad in a major trade magazine that stated: �about 60%of all printed circuit board manufacturing defects are due to stencil printing� I would like to hear comments from people that are running SMT lines, is this fact and if it is, w

Solder buildup inside Relow Oven

Electronics Forum | Thu Oct 23 09:45:05 EDT 2014 | rgduval

Generally, excess solder balls found randomly around the board/parts points to either a dirty stencil during printing, or a stencil/board that is shifting during printing (smearing the paste a little, and causing a dirty stencil. If the apertures ar

Stencil cleanliness and inspection

Electronics Forum | Tue Jun 05 14:38:55 EDT 2001 | pteerink

You would be better served to check your print quality as you run. Any problems caused by dirty stencils ( plugged aps etc ) would show up right away as a defect. Search the forum for more on this subject. I seem to recall the same subject coming up

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