Electronics Forum | Fri Mar 31 03:55:37 EST 2000 | Chris May
I have a similar problem with a screen printer. It is 5 years old and has seen better days.But it still works, doesn't it ? Now that most companies are fronted by financial guys and not engineers who have worked their way up, it is harder to prove y
Electronics Forum | Fri Mar 03 10:07:15 EST 2000 | Wolfgang Busko
Hi Jacqueline, - what a name in this technical world - I just tried the calculator and for example choose the CQFP and then selected other and an input mask appeared where you have to fill in the required data from the components datasheet. I have to
Electronics Forum | Wed Nov 03 10:30:27 EST 1999 | John Thorup
Hi Anthony I'm not sure I understand your question. Do you mean move to a better or more precise placement or to an error or bad position? I'm not aware of any calculation that can predict movement since it is based on so many factors like component
Electronics Forum | Wed Nov 03 20:02:44 EST 1999 | Anthony Winston
Well John here is the situation: I need to place an infrared transistor (optical element) with a tolerance of +/-.003", this is not a problem. A lens is positioned over the optical element and snapped to the PCB via three holes that have a toleran
Electronics Forum | Thu Aug 26 07:12:23 EDT 1999 | Mika Johnsson
| | I rotated my PCB -90 degrees. Now what's the formula to calculate the X-Y Coordinates of my component CAD Data? | | | | Thanks, | | | Not very difficult | | (Subscripts n = new, o = old) | | Assuming the same origin: | | Yn = Xo | Xn = -Yo |
Electronics Forum | Fri Aug 27 07:28:26 EDT 1999 | Brian
| | | I rotated my PCB -90 degrees. Now what's the formula to calculate the X-Y Coordinates of my component CAD Data? | | | | | | Thanks, | | | | | Not very difficult | | | | (Subscripts n = new, o = old) | | | | Assuming the same origin: | | |
Electronics Forum | Sat Apr 25 12:58:13 EDT 1998 | Earl Moon
| Is there an industry standard in calculating SMT process | PPM level for benchmarking purpose ? What are the industry | benchmark ppm number for some of the defects like solder | short for 20-mil QFP, tomstone problem for 0603 components etc....
Electronics Forum | Thu Sep 27 10:28:29 EDT 2001 | John S
It seems to depend on your situation. We're an OEM manufacturer and run the same products for extended periods of time. We monitor process indicators such as Dave listed, but we also monitor process defect trends. This is product specific of cours
Electronics Forum | Wed Oct 24 11:57:17 EDT 2001 | mparker
http://www.ceeris.com/DPMO.htm Ceeris is a company that may help you. They collect data and publish benchmark results. Their DPMO report will give you the data you need, for each process step. It's not cheap- they want $3000 per copy. Beyond that,
Electronics Forum | Fri Nov 23 03:40:09 EST 2001 | ianchan
Hi All, agree 100% on product characteristics SPC, and do find process indicators such as paste Volume, useful to monitor via SPC, the printing process, as printing constitutes "70% cases of SMT defects". We juz purchased a 2nd hand CyberOptics 3D
