Electronics Forum | Thu Jan 06 17:56:14 EST 2000 | Brian W.
I agree with Dave that passte volume is the most preferable criteria. However, you need to determine what you will accept and what your process is capable of. You need to define the process parameters, put procedures in place to control them, reduc
Electronics Forum | Sat Jul 10 02:47:27 EDT 1999 | Scott
| | | Hi! | | | I'm a process engineer attempting to do a capability study on our existing convection reflow oven - Heller 1500. It was recommended by an independent consultant to do at the very least, load testing, process ready testing, and board
Electronics Forum | Fri Apr 10 03:39:50 EDT 1998 | Frank J. de Klein
| 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. Cpk's
Electronics Forum | Wed Jun 06 02:59:11 EDT 2018 | buckcho
Mr. Evtimov, Koh Young and Parmi have this option in their SPC software. You can also choose either Volume, Area, position, height (both in um or %). Here is a screenshot from Parmi. Unfortunatelly i cant find my old Koh Young screenshots. Parmi has
Electronics Forum | Wed Feb 22 12:19:49 EST 2006 | Dirka Jihabi
I worked for a EMS who makes Medical Device Electronics, and yeah, the FDA's methodology for validation is a complete cluster-fudge! They did it on the principle of...does the shop air going into your equipment REALLY 80 PSI...or is there REALLY 220
Electronics Forum | Wed Jan 08 22:33:24 EST 2003 | jonfox
1. Do you have the necessary equipment to take on such a task and 2. Why? My only guess is that you are looking to find the probability or likelihood of a particular observation and / or a "confidence" score on your other equipment. This is just a
Electronics Forum | Sun Apr 25 11:05:58 EDT 2010 | davef
Try: * Statistical Process Control for SMT; Dr. William Messina; Datasleuths; ISBN: 0967503396; 1999 * http://www.google.com/search?q=calculate+cp+cpk&ie=utf-8&oe=utf-8&aq=t&client=firefox-a&rlz=1R1GGLL_en___US374
Electronics Forum | Mon Aug 19 20:44:01 EDT 2002 | davef
George: There is no industry standard for the calculation of process capability. Although, you should be aware of IPC-9850, Surface Mount Placement Equipment Characterization Actually, there is a grand bulk of discussion on process capability in t
Electronics Forum | Wed Oct 28 14:12:48 EST 1998 | Stefan W.
The only method I would trust measuring the cp or cpk is with an optical coordinate measuring machine used in metrology labs. The machine should have at least ten times better accuracy than the machine to be measured. For a print area of 18"X18" you
Electronics Forum | Wed Mar 18 13:21:26 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. Cpk's
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