Electronics Forum | Tue Dec 07 21:38:54 EST 1999 | Sosina outry
Correct me if i am mistaken, I always hear the circle is better fid mark than any. Due to shape and dimension, one value of diameter is needed while square you need width and lenght. beside whichever fid mark, the accuracy will base on cad and techn
Electronics Forum | Mon Dec 06 10:26:56 EST 1999 | Dave F
Yins: We all use "Mnemonic" words or phrases to help in remembering facts. As part of our on-going training, we're trying to use a mnemonic to help people remember the resistor color code. Certainly, we "sailors" learned one that doesn't fit wit
Electronics Forum | Fri Dec 10 08:58:15 EST 1999 | Boca
Allow me a disagreeable moment here. 'Bad boys..' is memorable (learned it in high school), and that is the point of using a memory device is it not? Its purpose is not cultural training, moral instruction, or a life plan it is just a memory devic
Electronics Forum | Fri Dec 10 09:12:16 EST 1999 | Dave F
Boca: I appreciate your point, but that's surely not what the 60+% percent of our female assemblers think!!! Why make someone feel bad when there's no point, aside from learning a new way of doing something? I'm not sure that it makes any less of
Electronics Forum | Fri Dec 10 08:58:19 EST 1999 | Dave F
Glen: Thanks for the clarification. I agree with Wolfgang that fluxer setup could be the source of the problem. Bottom-side wave solder shorting has a fairly wide range of potental causes. For instance slow conveyor speed can produce the same con
Electronics Forum | Mon Dec 06 13:54:01 EST 1999 | Andy Yates
Mathematically, measure the component offsets from nominal then calculate the average and the SD of the offsets in x and y. You can then use the following equation to calculate the CpK: CpK = (Process Width - Abs(Average offset)) / (3 * SD offset)
Electronics Forum | Mon Dec 06 14:56:49 EST 1999 | Russ
The best way that I have found to calculate CPk for placement machines is to buy the kit that is usually provided by the manufacturer of machine. It usually consists of a glass plate and glass components that are scaled. You simply program the mach
Electronics Forum | Mon Dec 06 17:17:57 EST 1999 | Brian W.
I have not used a vision inspection system for this. We used a digital x-y coordinate measurement system. With this, we could find the center of the part and then measure where it was in relation to a fixed point, like a fiducial. Some of the syst
Electronics Forum | Wed Dec 08 08:20:20 EST 1999 | Jerry Stafford
Michael, You need to know the measurement capability of whatever system you use to do your CpK measurement. Ideally you would do an error of measurement study of the measurement process. It is hard to imagine a measurement system that would err on
Electronics Forum | Sat Dec 04 02:21:32 EST 1999 | Vinesh Gandhi
Hi All, I am facing a strange problem. One of my esteemed & valued customers has an unusual requirement of cleaning the board with IPA after soldering is complete. I am using alpha metals UP78 no clean sodler paste during reflow. This IPA cleanin
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