Electronics Forum | Sat Mar 21 16:33:09 EST 1998 | Earl Moon
| | | Cpk's on top flight ovens (e.g., Conceptronics, Heller, Electrovert, Vitronics) vary wildly, from 1 to 2+, between different supplers. The suppliers don't seem to understand Cpk's. A supplier's rep whose oven has a Cpk of 1.0 told me: | | 1.
Electronics Forum | Wed Nov 21 05:12:26 EST 2001 | frha
Thanks!! I have bought this book. SPC for SMT by William S. Messina. It is an book with very deep calculations, I need to have the basics on place first - which characteristics may vary from unit to unit and batch to batch. I think that we have a V
Electronics Forum | Fri Nov 30 00:33:37 EST 2001 | jamstart
It will be a 'risk' to rely the volume using cyberoptic as it does not tell you the true volume. With no disrespect to them, they are only using 'mathematical' calculation (LxBxH)to get the volume. As we know that the paste will never be a flat surfa
Electronics Forum | Wed Mar 13 09:08:40 EST 2002 | stockley
It is a little bit sad that I know this - be prepared for some confusision - this is not as simple as it might seem. Something tells me that the calculation of the tolerances for the nominal dimensions is a little inconsistent. As I recall the defa
Electronics Forum | Tue May 14 11:52:04 EDT 2002 | Claude_Couture
Excuse me, but if I remember my physics lessons well, volume is what the water displacement measures, not mass. therefore, if you take the volume of water displaced by your populated PCB, divide it by the thickness of the PCB (which is easy to measur
Electronics Forum | Tue May 14 13:19:23 EDT 2002 | stefwitt
Claude is right, however, this may work: Dip the empty board in paint and let the access paint drip off. Measure the volume of the paint before and after. Dip a populated board and measure how much more paint was required in percent. Measure the surf
Electronics Forum | Sat May 25 20:09:50 EDT 2002 | Kevin
We use Sanyo TCM3000 series machines to place 0201 compnents and they run excellently. The Sanyo machine has corrective pick up on the x and y and H axis but also has a automatic corrective pick up where the component camera looks at a combination of
Electronics Forum | Wed Jul 03 19:17:54 EDT 2002 | davef
I prefer 'YAUC' [Yet Another Unit Converter] by Marius Miller. YAUC converts between many units - Metric, Imperial and others. It supports 585 units, in 40 categories, including Acceleration, Angle, Area, Current, Density, Energy, Force, Frequency
Electronics Forum | Thu Jul 18 08:54:49 EDT 2002 | Mark S.
How do you capture the workmanship details on a "per joint" basis? I have recently implimented first pass yield in SMT but it is based on the whole part and not the number of joints. And yield is calculated by PCB failure rate..a PCB with a solder b
Electronics Forum | Fri Jul 04 19:39:08 EDT 2003 | AlCapone
i'm newbie to this forum, I have a question about Cp and Cpk, nowaday, what number of ppm your company targets. Also as a SMT engineering you guys operate the whole smt line from SPM to ICT, has your company let you calculate the Cp and Cpk or there
