Q.2 For an assembly operation you should calculate the Standard Time of the operation. You secure and record information about the operation, and divide the operation into elements and record a complete description of the method for conducting a Continuous Stop-Watch Time Study. Then, you have obtained below continuous timings for 6 parts. a. Factory uses Westinghouse Rating systems for rating their operators and operator chosen for the study has: i. almost good skill, good effort, poor consistency, good conditions. ii. normal working environment, but iii. the work is light and iv. have no planned rest periods. Calculate the rating of the operator, determine allowance and calculate the standard time. (30 Points) b. By using 1" Element of the operation, is the number of observed cycles (parts) enough for a good conclusion? Use 95% confidence level and a precision of 5% (20 Points) NK Manufacturing Company - Observation Sheet 2 3 4 5 6 T Element Description 1 - Carrying the Equipment 2 - Mounting 2 23 42 63 82 102 R T IR 6 28 46 67 87 107 IR 12 33 52 72 92 113 IR 16 37 56 76 96 117 T 3- - Fixturing 4 - Assembly T Operation 5 - Uninstalling the T Equipment R Selected Time Rating 20 40 60 79 100 Normal Time 121 Standard Time Allowance Effort Al Super skill Excellent B1 Excessive A2 Excellent B2 Good Skill Al A2 B1 B2 C2 D E 1 E2 FI F2 +0.15 +0.13 +0.11 +0.08 +0.06 +0.03 0.00 -0.05 -0.10 -0.16 -0.22 Good +0.13 +0.12 +0.10 +0.08 +0.05 +0.02 0.00 -0.04 -0.08 -0.12 -0.17 Cl C2 Average Fair Average Fair Poor E 1 E2 FI F2 Poor +0.06 +0.04 +0.02 0.00 -0.03 -0.07 Conditions A Ideal B Excellent Good D Average E Fair F Poor +0.04 +0.03 +0.01 0.00 -0.02 -0.04 Consistency A Perfect B Excellent Good D Average E Fair F Poor Q.2 For an assembly operation you should calculate the Standard Time of the operation. You secure and record information about the operation, and divide the operation into elements and record a complete description of the method for conducting a Continuous Stop-Watch Time Study. Then, you have obtained below continuous timings for 6 parts. a. Factory uses Westinghouse Rating systems for rating their operators and operator chosen for the study has: i. almost good skill, good effort, poor consistency, good conditions. ii. normal working environment, but iii. the work is light and iv. have no planned rest periods. Calculate the rating of the operator, determine allowance and calculate the standard time. (30 Points) b. By using 1" Element of the operation, is the number of observed cycles (parts) enough for a good conclusion? Use 95% confidence level and a precision of 5% (20 Points) NK Manufacturing Company - Observation Sheet 2 3 4 5 6 T Element Description 1 - Carrying the Equipment 2 - Mounting 2 23 42 63 82 102 R T IR 6 28 46 67 87 107 IR 12 33 52 72 92 113 IR 16 37 56 76 96 117 T 3- - Fixturing 4 - Assembly T Operation 5 - Uninstalling the T Equipment R Selected Time Rating 20 40 60 79 100 Normal Time 121 Standard Time Allowance Effort Al Super skill Excellent B1 Excessive A2 Excellent B2 Good Skill Al A2 B1 B2 C2 D E 1 E2 FI F2 +0.15 +0.13 +0.11 +0.08 +0.06 +0.03 0.00 -0.05 -0.10 -0.16 -0.22 Good +0.13 +0.12 +0.10 +0.08 +0.05 +0.02 0.00 -0.04 -0.08 -0.12 -0.17 Cl C2 Average Fair Average Fair Poor E 1 E2 FI F2 Poor +0.06 +0.04 +0.02 0.00 -0.03 -0.07 Conditions A Ideal B Excellent Good D Average E Fair F Poor +0.04 +0.03 +0.01 0.00 -0.02 -0.04 Consistency A Perfect B Excellent Good D Average E Fair F Poor
