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
Electronics Forum | Wed Feb 26 03:43:40 EST 2003 | alwil
We use an alpha metal stencil cleaner and was curious to find out what types of solvents and cleaners were used out there. It takes about 350-400 litres of fluid. I would be interested if there is something water based we could use. What types of ste
Electronics Forum | Mon Apr 07 13:02:30 EDT 2003 | kmorris
Sorry, I forgot to include the stencil thickness. It is 5 mil. Thanks for the input, everbody. I just checked with our stencil supplier & I thought that Electro-polish was standard with lazer, but I now find out it is not. Our stencil did not get
Electronics Forum | Wed Dec 03 15:54:36 EST 2003 | James
You can get a new DEK ELA fully automated stencil printer with vaccuum cartridge under stencil cleaning and 2D board inspection for well under $90K. I just bought another one for my second line. We currently do 0402s and 16 mil pitch with wonderful
Electronics Forum | Wed Jan 21 10:41:57 EST 2004 | davef
Depending on how you frame the question, either of you could be correct. Neither of you mentioned stencil thickness, which together with aperture opening [and stencil fabrication technology] define how well a paste will release. So, the key measure
Electronics Forum | Tue Apr 13 08:25:15 EDT 2004 | arcandspark
I would have gone to a .004" stencil but again, the board designers, which we have no control over or are we allowed to give input to, have made the pads on all connectors and many other parts so small that we are almost seeing insuffecient solder us
Electronics Forum | Tue Apr 27 14:54:26 EDT 2004 | Kirk
reduction apertures in stencil and question how find center?. I thought that vision start playing important role at the beginning for the first PCB, help set precisely printing process. You gave tip to work without Mylar. Ok but again how you set ste
Electronics Forum | Tue Oct 26 00:49:42 EDT 2004 | pilengr_tw
Yes, we have an SOP on how to measure. Basically, calibrate the measuring device and measure tension on the 4 sides and one at the center of the stencil. All measurement should be within 30 ~ 50 N/cm otherwise we will not use it and return it to sten
Electronics Forum | Wed Mar 23 18:37:30 EST 2005 | KEN
We currently have about 800 active stencils. You Need a phase out program for your customers products. Otherwise you end up in stencil hell! Additionally, our smt team uses an access database to find what they need. Customer, assembly,revision, s
Electronics Forum | Mon Jun 06 12:46:33 EDT 2005 | stepheniii
Don't forget follow up is very important with stencils. Check with SMT after the first run with each new stencil and see how it went. If you follow industry accepted standards you probably won't have any problems but you never know when you will run
