There are 3 2-level factors (screwing process, screw part number, and tightening torque). The first 2 are attribute (process A or B, PN A or B). The tightening torque is a continuous variable (the 2 selected levels are current torque = 4 lb.in, new proposed torque = 5 lb.in). There is another factor that has 4 levels and is attribute…[Read more]
By the way, we are measuring a product performance parameter which is not specified, but less is worse so less than 1.5 is undesirable. However, I want to forget by now about the practical application and take it as a purely scientific experiment. These are the factors, thee are the levels, these are the results of the output variable. What…[Read more]
Hi Chris, thank for your answers.
1. I can’t see how I can restrict this factor to 2 levels, The product has 4 holes and it may happen for example that 1 hole is performing significantly different than the other holes. Taking only 2 holes can eleminate the significant one. On the other hand, if I put 2 holes together at the same level (so I have…[Read more]
Hi all. I am running a DOE that, unexpectedly, resulted more complex (to me anyway, not a lot of experience with DOEs) than initially expected. The challenges are 2:
1- The DOE has several factors. Most of them have 2 levels. But one of the factors necessarily has 4 levels because we are measuring a performance characteristic (some retention…[Read more]
You ask “Is staying within 3 sigma control limits throughout the run enough to accomplish this?”
The answer… it depends.
IF the +/-3-sigma control limits are such that the Cpk is 1.67 or better*, then yes, it is enough.
This means that, for the control limit that is closer to the specification limit (be it the upper or lower control limits),…[Read more]
As other posters have said, your question is too basic and a complete explanation would take a whole book.
However, I’ll attempt to make a conceptual introduction, not very rigorous but understandable (I hope).
A process control chart (like the Xbar-R, among others) and a capability study (like Cp/Cpk, again among others) are two very different…[Read more]
Muchas gracias Arturo , mi de hecho se ha implementado hasta su culminación un proyecto SS, pero la tesis la quiero denominar “Propuesta de implementación de la metodología Seis Sigma en la Planta X Coatzacoalcos para mejorar la calidad de sus procesos” , quisiera saber si está bien estructurado el nombre de la tésis y si es válida para reali…[Read more]
This post in an old thread might help.
27 posts to answer how likely is to get 2 bad out of 2 drawn in a poulation with 5 bad out of 42!
And about half of them are wrong!
Nice to see that the iSixSIgma forum didn’t change that much in the time I’v been out. Time for another break.
PS: One thing DID change. Stan was wrong!
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