iSixSigma

Karim Mohsen

Activity

  • @cseider

    but i think that 6 samples are too few to do capability analysis ,or do you mean to combine the all 6 samples of the 30 batch in one capability analysis and one control chart ? if you mean this so , it will be more reasonable than that the customer want , the only disadvantage of this is that it will take very long time to achieve…[Read more]

  • @rbutler

    30 sample from each batch for total 180 samples , he wants to run the capability and control chart for each batch 1 year, 7 months ago

  • @cseider
    it is customer request , to do the capability and the control chart of 30 samples from different 6 batches each 1 year, 7 months ago

  • If I had about 30 samples obtained from one batch produced in certain time and under same condition, which is better to use I-MR chart of X bar & R chart?

    And which chart should i use if i had 30 results from 30 different batches produced in several days ? 1 year, 8 months ago

  • what is meant by Cpk is for short term, Ppk is for long term.? And
    Is Cpk tells you what the process is capable of doing in future,while Ppk tells you how the process has performed in the past?
    please help to understand this 1 year, 8 months ago

  • could you please explain to me when i can use the shifting as a solution , i google it but i can’t understand
    i know that i must find the causes of the variation either they are special or common causes but i also know that i may use the solution of shifting the process mean as one of the solutions

    could you please clarify this 2 years ago

  • @rbutler

    but suppose that the results moving toward the upper spec. limit , so if i can move the specs little bit and examine the process again and gives me better CPk, isn’t this may consider a fast solution ? 2 years ago

  • is one of the improvement methods in six sigma is to make shifting to the mean of the process as a first step before starting six sigma project (DMAIC)?
    and if it is possible how to make this shifting? 2 years ago

  • @rbutler

    more variables like what that may impact variation than operators and machines ? 2 years ago

  • what is the difference between if the special cause appears in sample range and sample mean in control charts?

    I know that it they appears in sample mean that is mean that there is problem in equipment or the operator 2 years ago

  • @rbutler Thank you for you great effort, what a genius answer !!!!!!!!!!! 2 years, 1 month ago

  • what is the mean of the P value ? & what P stand for ? and is 0.05 reflect the confidence interval percent? 2 years, 1 month ago

  • Hi @rbutler ,

    1-The batch is done in one blender ( a batch consists of the output of a single reactor vessel)
    2- when i said that the process is normal before the modification I mean that i did the analysis of 9 batch ( 30 sample each) to examine the performance of my process before i start the six sigma project
    3- all the batches i examine was…[Read more]

  • Dear @rbutler

    First, I am sorry if i am bothering you with my questions but as i mentioned before I am new in six sigma and this is my first six sigma project and i need to understand more

    second, let me show you what i am working on
    1- i am working on flavor powder and i am measuring the chloride content of it
    2- my goal is to achieve cpk…[Read more]

  • what is the optimal value of the lambda to be considered ? 2 years, 8 months ago

  • @cseider

    why 13.9**5 ……why 5 especially is it constant factor or depends on what ? 2 years, 8 months ago

  • @butler

    will the process be stable by time or i need to make shifting to left or a modification to the process itself? 2 years, 8 months ago

  • I did what you sent me but still the same

    you said that the transformation happened to the spces and data , but i can’t found any relation between the 2 number ( i mean after and before transformation)

    noted that it is the first time i deal with the transformation , so i can’t understand anything 2 years, 8 months ago

  • The data in the my previous reply
    but could you explain the transformation that happened ? 2 years, 8 months ago

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