How to perform MSA Studies on a part having ONE side tolerance? Eg,. : Runout in a shaft. Our views!
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- Johnathan Russell
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1 An interesting Question from Mr. G Subramanian of Poclain Hydraulics of Pondicherry How to perform MSA Studies on a part having ONE side tolerance? Eg,. : Runout in a shaft Our views! 1
2 First and foremost, what must be the needed facilities for conducting an MSA study ( specifically for a Variable MSA study Stability check, Bias, Linearity or GRR? We need to have the Equipment ( on which the MSA study has to be conducted ), Appraiser, Part ( Preferably the part, for which the equipment is being used or going to be used! ), Measured dimension of that part ( True value! ) and the Manufacturing process variation ( Sigma cap of the process, from which the part was produced )! Secondly, what has to be ensured, before making all the calculations? Have the repeated readings ( may be 12 to 15 readings ) on the same part, same location by the same appraiser! Immediately after this, we have to ensure the Normality of the Measurement process! This is generally done by plotting all the 12 or 15 readings ( Data points ) in a form of Histogram! 2 Histograms are drawn, one for the data points and the other is for the Bias values! This practice prevail both for Bias study and Linearity study and once the Histogram indicates a Bell curve, the Normality is considered as okay! 2
3 If we deal with an SPC study ( Study of a Manufacturing process ), generally a Bell curve ( Gaussian curve ) is an indication of process normality ( Stability factor of the manufacturing process ). Does it mean, that a skewed distribution is always an indication of process unstable? The answer is NO! Geometrical dimensions, such as Run out, Face out, Cylindricity, Surface roughness and Hardness will NOT form a Bell curve! This never means,that the manufacturing process is unstable! The Process Capability computation method is quite different on such situations, which we have already explained last month ( June 2017 Share & Care )! Now the question is, on such Geometrical dimensions ( Such as Run outs, Face outs, etc,. ), how to perform MSA studies? 3
4 This question must have come to the mind of Mr. G Subramanian of Poclain-Hydraulics, with an assumption, that the data points taken during MSA studies will also form a Skewed distribution! When the data points taken from a manufacturing process can form a Skewed distribution will one part taken from that manufacturing process also lead to a Skewed distribution? The simple answer is the MSA data points should NOT lead to a skewed distribution! If they lead to a skewed distribution, it MUST be considered ONLY as a sign of ( Inspection or MSA ) process Instability ( Sign of Special cause variations )! That being the case ( I have come across one such situation some time back!!! ), we should abandon the Study! The special cause variation must be fixed and a new part must be selected for the study! 4
5 Eg,. : Runout in a shaft Our views! In a nut shell. Situation Activity Ideal Pattern of distribution Conclusion I II III IV Process capability analysis on a manufacturing process which is not involved with any geometrical dimensions. Process capability analysis on a manufacturing process which is involved with any geometrical dimensions. MSA study on a part representing a manufacturing process, which is not involved with any geometrical dimensions. MSA study on a part representing a manufacturing process, which is involved with any geometrical dimensions. Gaussian ( bell curve ) arising out of Histogram Skewed distribution, arising out of Histogram Gaussian ( bell curve ) arising out of Histograms ( one from the data points and the other from the Bias values ) Normality is okay. If it lead to a Skewed distribution, it is an indication of process unstable Special cause variations present. Normality is okay. If it lead to a bell shaped distribution, it is an indication of process unstable Special cause variations present. Normality is okay. If it lead to a Skewed distribution, it is an indication of process unstable Special cause variations present. Abandon the study. Analyse the special cause variations and fix them. Re-start the MSA study after this. Simply, the manufacturing process may deal with any type of dimension. The part taken from the process is expected to give us a Bell curve only! If the above rules are satisfied, we shall proceed with any MSA study, adopting the regular guidelines being followed for any MSA studies! Sri Padhmam Consultancy & Training office@sripadhmam.com 5
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