Here is a brief intent on 1 of the projects am working on and need feedback from the experts here
Intent: Reduce variation within product and from product to product
Measurable : Height @ Facing Operation
Sampling : 5 pcs every 30 mins
Gauge : Dial Indicator
Measures : Max & Min Height of product
Issues --- some products have unilateral tolerances and make it hard for me to conduct a capability analysis as data is log-normal rather than normal (atleast that is what I interpret )
Right now am using a box plot to characterize the variations existing within 1 product (min max - range) and using a X-R chart to deduce variations across lots(of 5)
Process capability analysis of the data has left me stumped ....
Any recommendations on how I should proceed in this case?
Intent: Reduce variation within product and from product to product
Measurable : Height @ Facing Operation
Sampling : 5 pcs every 30 mins
Gauge : Dial Indicator
Measures : Max & Min Height of product
Issues --- some products have unilateral tolerances and make it hard for me to conduct a capability analysis as data is log-normal rather than normal (atleast that is what I interpret )
Right now am using a box plot to characterize the variations existing within 1 product (min max - range) and using a X-R chart to deduce variations across lots(of 5)
Process capability analysis of the data has left me stumped ....
Any recommendations on how I should proceed in this case?