Electronics Forum | Tue Sep 21 06:46:58 EDT 2004 | davef
Background on activation energy for diffusion can be found: * Materials textbooks * College lectures posted on the web. Use 'google' or someother search tool. As a guideline, the higher the activation energy, the harder is is for diffusion to occur
Electronics Forum | Fri Sep 17 03:25:45 EDT 2004 | soease
Hi all, does anyone of you use step stencils for paste application? Did anyone experienced troubles with those kind of stencils? thanks for answer sly
Electronics Forum | Fri Sep 17 09:44:26 EDT 2004 | davef
We agree with Russ. * Haven't used them in 10+ years. * Size of keepout for the stepped apertures needs to be large. * Manipulating aperure size to manage paste volume for specific components is not difficult.
Electronics Forum | Wed Sep 22 22:56:44 EDT 2004 | davef
Talk to 10 people and you get 10 recommendations for pad layout. So far, here's number 3 [after IPC and AVX]. We suggest: * Use the IPC recommended standard. * Change from that standard when someone gives you a documented reason to change.
Electronics Forum | Wed Sep 22 22:32:12 EDT 2004 | pdeuel
We use a chunkee trimmer in prep. Cut bend and form all thru hole parts before first assembly.
Electronics Forum | Wed Sep 22 22:30:50 EDT 2004 | davef
We are aware of no such standard. You need to determine the acceptable level for your product in its use environment.
Electronics Forum | Fri Sep 24 11:32:06 EDT 2004 | C Lampron
Hi John, We have been selective soldering for about two years. My suggestion is to use the same guidelines for preheat, duration and temp as you would in wave. Your flux manufacturer should be able to provide you with the details. Good Luck Chris
Electronics Forum | Thu Sep 23 11:50:54 EDT 2004 | JB
We are using a standard nozzle Once placed, the label is not flat, the ends of the label are slightly lifted on both ends. The label is .650 x .200 Have you guys run into a similar problem?
Electronics Forum | Wed Sep 29 15:42:25 EDT 2004 | russ
Make sure that you use lead paste and solder for this. (See Dave I listened) Russ
Electronics Forum | Fri Sep 24 04:11:13 EDT 2004 | rob
Hi Chics, It all depends on where you are in the world - in Europe robots were used back end (Ericsson), and usually Fujis front end (Motorola, Nokia, Ericsson). In China you're obviously not going to need the Robots.... Cheers, Rob.
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