Productivity,Time Study, Allowance Fraction & Labor Std
Problem 1:
A time study is performed on an operation, resulting in the
data following (in minutes).
Cycle
Element 1 2 3 4 5 6 7 8 Performance
Rating
1. Get and position unit 0.22 0.27 0.19 0.24 0.17 0.24 0.21 0.18 1.10
2. Perform calibration 2.20 2.70 2.50 3.10 2.80 2.40 3.20 2.70 1.30
3. Perform standard tests 4.60 4.00 4.50 3.80 4.30 4.50 3.90 4.40 0.85
4. Update card and remove unit 0.50 0.50 0.70 0.60 0.80 0.40 0.50 0.60 1.20
Allowance per Eight-Hour Shift:
Clothes change 15
minutes
Unavoidable delay 35
minutes
Lunch 30 minutes
Shower and change 30
minutes
Total 110 Minutes
a. Compute
the mean observed time for each element in minutes.
b. Compute
the normal time for each element and total normal time in minutes.
c. Compute
the allowance fraction for the operation. Assume 480 minutes per shift.
d. Compute
the labor standard for the operation.
Problem 2:
A work-sampling study was conducted of an assembly
operation. The results of the study are:
Activity Number of
Observations
Assemble products 85%
Allowances 15
If the workers who were performing the operation during the
study each produced an average of 100 products per eight-hour shift and
received a performance rating of 1.15, what is the labor standard per product?
Problem 3:
It takes a manufacturer 120 hours to produce the first
product in a batch of 15 products, and a 75 percent learning rate is expected.
a. Estimate
the time it will take to produce the fourth product.
b. Estimate
the total time it will take to produce the entire batch
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