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【正文】 surements taken from stable instrument Measurements taken with stable instrument recalibrated before each reading Gage Ramp。 Reproducibility ( m) from partto part variation ( p) How a Gauge Ramp。R study is a set of trials conducted to assess the repeatability and reproducibility of the measurement system. ? Multiple operators measure multiple units a multiple number of times. ? Example: 3 operators each measure 7 units twice. ?―Blindness‖ is extremely desirable. It is better that the operator not know that the part being measured is part of a special test. At a minimum, they should not know which of the test parts they are currently measuring. ?You analyze the variation in the study results to determine how much of it es from differences in the operators, techniques, or the units themselves. 18 How a Gage Ramp。% ?T ol e r anc e sSTP s y s t e mtm e as ur e m e n _*?Unacceptable Desired Acceptable Borderline 0% 10% 20% 30% 100% ? General guidelines for interpreting Gage Ramp。R Study Use your notebook to follow along. 24 Using Gage Run Chart Use your notebook to follow along. 25 Output From Gage Run Chart Use your notebook to follow along. 26 Performing a Gage Ramp。R Output From Minitab Use your notebook to follow along. 30 Interpreting the Gage Ramp。R study evaluates the Repeatability, Reproducibility and Resolution of a Measurement System, but tells us nothing about its Accuracy. ?If ―true‖ values of part measurements across the operating range of the system are available from a ―Master‖ gage, and several measurements of those parts are made on the measurement system, then Minitab can be used to calculate ?Accuracy the average deviation from the true value ?Linearity the slope of the error across the range ?The results are expressed relative to the process variation, obtained as the total of the * sigma column of a Gage Ramp。R study. Time: 15 mins. Instructions: Working in small groups, discuss both situations below. Be prepared to share your answers with the class. Checking a Measurement System for Discrete Data 47 Revision Exercise: Attribute Gage Ramp。R, cont. Columns containing the appraised attributes 49 Exercise: Answers Use your notebook to follow along. 50 Exercise: Answers, cont. Use your notebook to follow along. 51 Improving a Discrete Measurement System Assessing the accuracy, repeatability, and reproducibility of a discrete measurement system ? Discrete data are usually the result of human judgment (―which category does this item belong in?‖) ? When categorizing items (good/bad。R Case Study IS Help Desk See Notes Page 54 Case Study cont’d See Notes Page 55 Case Study cont’d See Notes Page 56 Case Study cont’d See Notes Page 57 Case Study cont’d See Notes Page 58 Case Study cont’d See Notes Page 59 Case Study cont’d See Notes Page 60 Case Study cont’d See Notes Page 61 Case Study cont’d See Notes Page 62 Case Study cont’d See Notes Page 63 Case Study cont’d See Notes Page 64 Case Study cont’d See Notes Page 65 Case Study cont’d See Notes Pag
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