Electronics Forum | Thu Nov 30 13:51:33 EST 2000 | Michael Parker
Thanks for the details. Next question- where is your first time pass rate measured? Is this at test? Do you have inspection gates at the end of each process step? To get to the root cause, you need the earliest detection. Collect attribute data by a
Electronics Forum | Wed Aug 16 05:20:29 EDT 2000 | Wolfgang Busko
Richard, take a given volume and weigh it. For your parts you have already determined the aperture opening and stencil thickness and that gives you the volume for each lead of the component. This way you should be able to determine the amount of pas
Electronics Forum | Fri Aug 18 05:43:51 EDT 2000 | Richard Berry
Thanks Wolfgang / Charles Have tried method suggested by Wolfgang on one product, and seem to be a bit over (perhaps density calculation was a bit out). Also, the volume of paste deposited must be less than the voume of the apetures on the stencil b
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....
