Electronics Forum | Tue Aug 12 08:35:28 EDT 2008 | avalancher
Many years ago... my old engineer used a very simple unit bought at Radio Shack. It was a device that they use in door ways to announce someone was entering the store. It used a beam of light and when the board broke that beam, a bell/ring/noise wou
Electronics Forum | Tue Aug 12 15:34:37 EDT 2008 | grics
That is very interesting... I am curious though, why wasn't a plain blind rivet used? You probably can, but personally, I would be not want a solder joint holding the frame and the pcb... Mechanical stress on solder joints often leads to not good re
Electronics Forum | Wed Aug 13 09:20:05 EDT 2008 | wrongway
we tested this kind of part about 3 years ago did a few prototypes I did'nt know how it was going to work but our old amistar picked it and placed it just fine used a small nozzle with a o-ring on the end of it I think it did ok going across the wav
Electronics Forum | Wed Aug 13 22:23:24 EDT 2008 | davef
8.4 * SAC305 => 7.36 * Sn-3.5Ag => 7.5 * '....in' [96.2Sn-2.5Ag-0.8Cu-0.5Sb] => 7.39 * Sn-4Ag-0.5Cu => 7.39, 7.44 * Sn-3.8Ag-0.7Cu (Multicore solder) => 7.5
Electronics Forum | Fri Aug 15 10:23:56 EDT 2008 | ck_the_flip
Ovens, and any other process for that matter, will ALWAYS vary. It's called process variation. I do Cpk (process capability) on my ovens. I track time-above-liquidus and peak temperatures. Statistics will validate how repeatable your oven is.
Electronics Forum | Tue Aug 19 08:16:21 EDT 2008 | grics
Nothing really... I guess my dry sense of humor doesn't translate very well through the forum... When you said MOSTLY that would seem to mean that you are more than 50% chinese, which I guess is possible. Sorry for not being funny. I will make sure
Electronics Forum | Tue Aug 19 15:27:50 EDT 2008 | realchunks
I could break it down for you, but to most - being Asian is just that, being Asian. I would say I am 75% Chinese and 25% percent "other". Breaking down that part would take too long, so my picture will have to do. The point I was making was I am n
Electronics Forum | Wed Aug 20 08:16:10 EDT 2008 | grics
Chunks... You are pretty damn awesome! Anyways, in regards to the original thread, we do get good boards from china as well, but we have had issues with stack-up tolerances and even mouse bite (drilled break away) tabs. Not to long ago, we left t
Electronics Forum | Mon Aug 18 13:37:23 EDT 2008 | realchunks
We do it all the time for air pressure reasons. Use a 6 mil stencil, print right on the via, aperture opening 100% same size as the via, on an 0.063" thick board. Doesn't leave a bulge and plugs the air. You can have your board house do this for y
Electronics Forum | Mon Aug 18 20:46:08 EDT 2008 | davef
Volume of paste = 2X volume of the hole Questions are: * Why does your customer want the hole filled with solder? * Would materials other than solder be acceptable? * We assume 0.020" is drill size. What is the finished size of the hole? * What is t
