# ACTIVITY DESCRIPTION

IMMEDIATE

PREDECESSORS TIME

A Attach wheels to tub — 5

B Attach motor to lid — 1.5

C Attach battery pack B 3

D Attach safety cutoff C 4

E Attach filters B 3

F Attach lid to tub A, E 2

G Assemble attachments — 3

H Function test D, F, G 3.5

I Final inspection H 2

J Packing I 2

a) Draw the appropriate precedence diagram for this production line.
b) Assign tasks to workstations and determine how much idle time is present each cycle.
c) Discuss how this balance could be improved to 100%.
d) What is the theoretical minimum number of workstations
Details:

Complete Problems 10.25, 10.29, E.3, E.5, and E.6 in the textbook.

Submit one Excel file. Put each problem result on a separate sheet in your file.

If so directed, refer to the Student Success Center for directions. Only Word documents can be submitted to Turnitin. 10.25 Peter Rourke, a loan processor at Wentworth Bank, has been timed performing four work elements, with the results shown in the following table. The allowances for tasks such as this are personal, 7%; fatigue, 10%; and delay, 3%.

ELEMENT

PERFORMANCE

RATING (%)

OBSERVATIONS (MINUTES)

1 2 3 4 5

1 110 .5 .4 .6 .4 .4

2 95 .6 .8 .7 .6 .7

3 90 .6 .4 .7 .5 .5

4 85 1.5 1.8 2.0 1.7 1.5

a) What is the normal time?
b) What is the standard time?
10.29. The Dubuque Cement Company packs 80-pound bags of concrete mix. Time-study data for the filling activity are shown in the following table. Because of the high physical demands of the job, the company’s policy is a 23% allowance for workers.

a) Compute the standard time for the bag-packing task.
b) How many observations are necessary for 99% confidence, within {5% accuracy?
ELEMENT

OBSERVATIONS (SECONDS) PERFORMANCE

1 2 3 4 5 RATING (%)

Grasp and place bag 8 9 8 11 7 110

Fill bag 36 41 39 35 112a 85

Seal bag 15 17 13 20 18 105

Place bag on conveyor 8 6 9 30b 35b 90

(A) Bag breaks open; included as delay in the allowance factor.

(B) Conveyor jams; included as delay in the allowance factor

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