As per mine knowlege, 1/10 is a rule we need to apply to pick a appropriate measuring instrument so as to ensure that Resolution of the Measuring Instrument is good enough to capture the variation in the product dimension or process charatcteristic for which this instrument will be used.
Six Sigma alone may not help the organization to move from one level of CMMI to another level. Each level of CMMI has certain requirements which are to be met before an organization can move to next level. Now at CMMI level 4 & 5 there is an requirement of continual improvement which definately can be met with Six Sigma methodlogy, but m…[Read more]
Not sure is you are doing this study for Variable or Discrete Attribute Measurement System. Butin any case as long as yiou meat the criteria of No. of Samples * No. of Appr. * No. of Trials >15, it shall be OK.
Though definately more the samples better it is.
Criteria of subgrouping is not getting reflected in your problem statement. I hope you understand subgrouping is just not collating the data & putting it into one category. When you said subgrouping of 25 data points, does that mean all the 25 samples were produced, measured at the same time. If not so than the subgrouping may have to be…[Read more]
Probably you can use a tool called QFD (Quality Function Deployment) in this kind of a scenerio.
In fact i would say this is the best tool for converting VOC to CTQ.
Just to give you a brief idea of the same let’s take an example:-
VOC:- Customer represntative’s understanding of the customer’s concern
Step 1:- define the pa…[Read more]
In case process is unstable, following steps have to be followed:-
1. Identify the reaasons of the Special Causes occuring in the process.
2. Take corrective actions so as to prevent the reccurence of the same.
3. Exclude the points with special causes after taking action & then recalculate Control Limits with the same formula. If required…[Read more]
As far as availability is concerned
Availability = Operating Time/ Loading time
Loading time = Available time (8 hrs)- planned downtime(1 hrs- lunch)
here u may take setting time (1hrs) as planned downtime if you donot want to improve on it.
Best state is if Loading time = Available time
Operating time = lo…[Read more]