【正文】 (by asking ―how much of the variation we see in our data is due to the measurement system?‖) ? Evaluate the results and develop improvement strategies 11 Ways to See if the Measurement System is Adequate Te s t f o r How Te s t Na m e1 . A cc u ra cy Tes t f o r t h e a m o u n t o fb i a s t h r o u g h o u t t h ep rod u c t rang e b yre p ea t e d l y m ea s u r i n g― k n o wn ‖ qua n titie sGag e l i n ea r i t y s t u d y(Se cti o n 3 )2 . Rep e at a b i l i t y Hav e t h e s am e s a m p l em ea s u re d re p ea t e d l y b yt h e s am e p er son . T h i sre v ea l s t h e variat i o n i nt h e m ea s u r em en t d e v i c e.Gag e Ramp。 R s t u d y(Se cti o n 2 )3 . Rep r o d u cib i l i t y Hav e m an y p eo p l e(i n str u m en t s o r l a b s ) *m ea s u re t h e s am e s am p l ere p ea t e d l yGag e Ramp。R ?The Gage Ramp。 they should not know which unit they are measuring when they record their results 23 Plotting the Data From a Gage Ramp。 Accuracy ?A Gage Ramp。R Study 48 Minitab Follow Along: Attribute Gage Ramp。 type of call。R study. ?The graphs amp。R Analysis Use your notebook to follow along. 27 Using Gage Ramp。R Study Works ?Select units or items for measuring that represent the full range of variation typically seen in the process ? Measurement systems are often more accurate in some parts of the range than in others, so you need to test them over the full range ?Have each operator measure those items repeatedly ? In order to use Minitab to analyze the results, each operator must measure each unit the same number of times ? It is extremely desirable to randomize the order of the units and not let the operator know which unit is being measured ?Minitab looks at the total variation in the items or units measured 19 How a Gage Ramp。R Study 15 0 50 1000 . 0 00 . 0 10 . 0 20 . 0 30 . 0 40 . 0 50 . 0 60 . 0 70 . 0 8I n d5n??pmThe Gauge R amp。R Gage Linearity amp。 Reproducibility ( m) from partto part variation ( p) How a Gauge 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 Output From Minitab Use your notebook to follow along. 30 Interpreting the 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 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