Specifications: .250+.008 DATA OF SAMPLE MEASUREMENTS 7:15 7:30 7:45 8:00 8:15 8:30 8:45 9:00 9:15 9:30 9:45 10:00 10:15 10:30 10:45 11:00 11:15 11:30 11:45 12:00 0.249 0.251 0.250 0.249 0.250 0.250 0.247 0.250 0.246 0.251 0.251 0.251 0.250 0.250 0.252 0.249 0.250 0.248 0.251 0.254 0.251 0.246 0.250 0.253 0.246 0.250 0.251 0.251 0.250 0.248 0.249 0.255 0.252 0.251 0.251 0.250 0.249 0.250 0.248 0.251 U A W N- 0.251 0.252 0.246 0.245 0.251 0.251 0.253 0.253 0.248 0.249 0.249 0.248 0.252 0.254 0.248 0.249 0.250 0.249 0.250 0.254 0.248 0.248 0.250 0.254 0.249 0.251 0.250 0.249 0.250 0.249 0.251 0.247 0.249 0.251 0.252 0.251 0.250 0.251 0.250 0.247 0.250 0.250 0.251 0.249 0.250 0.251 0.249 0.248 0.251 0.250 0.252 0.249 0.251 0.251 0.251 0.252 0.250 0.251 0.252 0.251 Xbar Range Xbarbar UCLxbar LCLxbar Roar UCLR LCLR Operator is to only enter data in yellow shaded The items Xbarbar, UCLxbar, LCLxbar, R-bar, UCLR, LCLR are plotted as solid straight lines on the chart. This requires that the same value be placed in each cell for the entire row for each of the items. Formulas for calculating the average range, the grand average and control limits are aiven below: UCL- = X + A2R (similar to + 30 of X ) Factors for Control Limits LCL, = X - A2R (similar to - 30 of X ) n A2 D3 D4 N 1.880 0.000 3.267 UCLR = DAR 3 1.023 0.000 2.574 LCLR = D,R 0.729 0.000 2.282 UI 0.577 0.000 2.114 6 0.483 0.000 2.004 Note! For sample size less than 6 LCLR = 0