Electronics Forum | Thu Feb 23 18:05:53 EST 2006 | kennyg
What are some general guidelines for the minimum proximity of apertures to a stepdown on a stepped stencil. I have a step from 7 mils to 5 (one mil step each on the top and bottom). How far does the step need to extend beyond the apertures on the
Electronics Forum | Fri Feb 24 08:29:25 EST 2006 | davef
Step stencils are not widely used, due to: * Higher cost as compared to uniform thickness stencils * Danger of solder paste smearing at least close to the steps * Difficulty of cleaning the stepped stencil underside (the steps cannot be on the upper
Electronics Forum | Fri Feb 24 12:34:13 EST 2006 | Ticky Ticky Tembo No Sarimbo Hari Kari Bushkie Perry Pem Do Hai
Stepped stencils are usually the result of some dumb customer's requirement. 2 examples I can give: 1.) Customer demanded 50% wick-up the termination of a MELF component. No way you can get that from reflow. Played around with a drastic "step up
Electronics Forum | Thu Mar 02 23:21:59 EST 2006 | KEN
I recently finished analysis of no-clean fluxes and Ionic contamination and cleaning processes. The results were eye opening. Summary: If you clean a no-clean you better do a good job. Many no-cleans produce a "waxy binder" to encapsulate the tro
Electronics Forum | Mon Feb 27 06:42:37 EST 2006 | Slaine
What are the long term issues with high tin content solders on parts plated with silver over copper? Is it possible that the silver will be absorbed by the solder then over a long period of time the tin will react with the copper causing it to part
Electronics Forum | Mon Feb 27 17:08:08 EST 2006 | barryg
we here are setting up our lead free process. Was curious about how others handle these issues. 1) Do you physicaly segregate leaded from non-leaded (different storage areas, shelving) for part storage? 2)Do you have a seperate board washer just for
Electronics Forum | Tue Feb 28 07:50:06 EST 2006 | amol_kane
we have used blue and red color solder mask on a trial basis for our LF assemblies. We are performing expts using Imm Sn and Imm Ag to determine the best surface finish. Also, we pass the LF baords thru the same inline wash as you dont wash away the
Electronics Forum | Wed Mar 01 22:15:28 EST 2006 | operator (Brandon)
I have been wondering about the inline wash too. We have a sister company that we share a wash with and I asked them there thoughts and they didn't seem concerned. I thought there was a little lead in the flux also there is smt tools(squegees, scrape
Electronics Forum | Mon Feb 27 20:17:54 EST 2006 | SJ
Could anyone kindly share any good/bad experiences that they have with their MRP / ERP systems in a small-mid size contract manufacturer environment? We've been using DBA Classic but is looking for a more scalable, robust system. Our main concern i
Electronics Forum | Tue Feb 28 06:55:44 EST 2006 | Rob
Hi I've used the following: SAP Connect & Go (or SAP in a box - designed for smaller companies)- despite the description a LOT of set up work, but not bad once you get the hang of it. Costs lots to change things though. Tetra CS3 - YUK! MFG Pro -
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