Electronics Forum | Thu Mar 29 08:54:50 EST 2001 | neil
The left menu displays the time that the browser window was opened or last refreshed. (notice that it does not tick) This is taken from the server's internal clock. These clocks are notoriously inaccurate. I'm looking into synchronizing the clock aut
Electronics Forum | Thu Mar 29 01:22:57 EST 2001 | chinaman
Hello everybody, Two questions came up during an audit (old topics once more): 1. we are not checking the solder paste volume/pad height after printing - others are using an AOI, but is it really necessary? We just do visual inspection randomly. We
Electronics Forum | Thu Mar 29 02:14:07 EST 2001 | peterson
AOI technology is over-priced and inconsistent...lots of false errors. Your best bet is a paste height measuring device (3-D) Cyberscope makes one for 25-30 thousand. This process is really only necessary for high volume operations. As for you questi
Electronics Forum | Mon Apr 09 05:15:36 EDT 2001 | sinclair
Why measure solder volume? I believe if one understand the process well enough, the effort should be spent on area that will gives better indication of your solder printing process. From my personal experience, a lot of auditor knows little of the pr
Electronics Forum | Mon Apr 09 20:13:01 EDT 2001 | davef
First, some people wait a lifetime for ... ;-) Second, how do you guys measure the stencil aperture clog? What do you think of the Magnaplancil from Fendelaz? It�s a double fyv-blue-green CO2 laser refract-defractometer. ;-) Third, do you really
Electronics Forum | Tue Apr 10 16:18:06 EDT 2001 | davef
What time? An in-line bot with a vision system tuned for paste recognition can measure a different portion of each board and keep pace with the placement machine all day long. I don't understand what you guys propose as an alternative. Realistical
Electronics Forum | Tue Apr 10 16:41:21 EDT 2001 | slthomas
OK, you're talking about inline AOI doin' all the work for you, for a price. Fair enough. If you can't afford the inline post-print inspection equipment, though, I still think you can depend on the 2D inspection of the paste to tell you if you've
Electronics Forum | Mon Apr 02 20:47:22 EDT 2001 | davef
Cuppla questions for ya ... Where are the shorts [above the mask or between the mask and the laminate]? On the board, what material is between the copper traces and the mask? What type of solder mask(s) used by your suppliers? What are they using
Electronics Forum | Fri Mar 30 18:24:12 EST 2001 | davef
There is no test. Beyond the issues that you mentioned that affect shear, an article published in a recent [1/01] "Journal Of Surface Mount Technology" documents that shear is also dependent on the rate of shear. You may be able to contact the auth
Electronics Forum | Sat Mar 31 08:47:24 EST 2001 | davef
Sure, researchers measure shear as an element of their material characterization process, but that does not make it an acceptance test. [Truly, this conversation is not uncommon on SMTnet. So, it would not surprise me if an enterprising something o
