Electronics Forum | Fri Jan 28 15:30:28 EST 2005 | davef
We were talking to a placement machine sales-type the other day. He stated that the Cpk for placing 0201 was 1.33 [Cpk = 1.33, Sigma = 4, DPMO = 6210]. What do you think?
Electronics Forum | Wed Aug 21 01:40:42 EDT 2002 | jkhiew
Hi all, Our management set target 50 ppm for overall process like printing,mounting & reflow soldering. Our m/c cpk for mounter is 1.0 & for printing is 1.33. So, pls comment !
Electronics Forum | Fri Jan 28 16:08:18 EST 2005 | russ
Maybe this number is only for the ones that actually got placed!? Like, we had a 15% pick error rate but the ones that did make it were great! So the 1.33 CPK was in regards to what parameter/specifications? accuracy, pick error, or what?
Electronics Forum | Wed Aug 21 17:50:05 EDT 2002 | davef
First, it�s GREAT that your defect rate of 282 is very close to your Boss� goal of 50 ppm. Second, your Cpk and your ppm numbers don�t tie out with our expectations. You say Cpk for: * mounter is 1.0 and �your mounting is 83ppm�. * printing is 1.33
Electronics Forum | Mon Jan 31 07:01:56 EST 2005 | pjc
These guys http://www.cetaq-americas.com/index.shtml have the CmController that can do the measurement to back up the p&p vendor's claim. A CpK of 1.33 ain't bad. Would like to see 2.0. The picking is critical too. Ask vendors for pick accuracy and
Electronics Forum | Sat Feb 10 09:36:52 EST 2007 | davef
Choices are: * Run a Cp, Cpk capable profiler through the oven. * Review the results of your supplier's process qualification that would include Cp, Cpk on their oven. Handspring contract [REV. 6 - 7/1/99] with Flextronics says: [snip] 4. Process Ca
Electronics Forum | Mon Feb 12 10:06:46 EST 2007 | CK the Flip Guy
DaveF, Please define a "Cp/Cpk capable profiler." Do you mean one that has software that automatically calculates this for you? I do this at my company, and we track 2 critical variables - Time Above Liquidous and Peak Temps. and this is done on a
Electronics Forum | Mon Mar 05 11:24:16 EST 2007 | samir
Something the "placement guys" don't tell the customers... Cpk is an easily "massagable" number. You just take some data points and reduce the variation a bit, or even play around with your spec limits, or a combination of the two to get the highes
Electronics Forum | Mon Mar 05 06:11:23 EST 2007 | pavel_murtishev
Good afternoon, http://www.panasonic-industrial.com/ Panasonic still supports their old models. Drop them an e-mail and they will answer your question. What Cpk do you need to know? Placement accuracy I suppose. Placement accuracy depends strongly
Electronics Forum | Thu Apr 26 08:34:32 EDT 2007 | ck_the_flip
Pavel is right...Your Quality Group, customers, and Management will really appreciate Cpk's. We do Cpk's annually, or whenever a major mechanical change (motor, blower, etc) is made. Pavel is correct in saying that Cpk's on most modern convection o
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