mathematics and management.

660

SUMMARY

Supplement to Chapter Fourteen Maintenance

Maintaining the productive capability of an organization is an important function. Maintenance includes all of the activities related to keeping facilities and equipment in good operating order and maintaining the appearance ofbuildings and grounds.

The goal of maintenance is to minimize the total cost of keeping the facilities and equipment in good working order. Maintenance decisions typically reflect a trade-off between preventive maintenance, which seeks to reduce the incidence ofbreakdowns and failures, and breakdown maintenance, which seeks to reduce the impact ofbreakdowns when they do occur.

KEY TERMS breakdown maintenance, 656 maintenance, 655

predictive maintenance, 658 total productive preventive maintenance, 656 maintenance, 658

DISCUSSION AND REVIEW QUESTIONS

L What is the goal of a maintenance program? 2. List the costs associated with equipment breakdown. 3. What are three different ways preventive maintenance is scheduled? 4. Explain thetermpredictiye maintenance andthe importance of good records. 5. List the major approaches organizations use to deal with breakdowns. 6. Explain how the Pareto phenomenon applies to

a. Preventive maintenance. b. Breakdown maintenance.

7. Discuss the key points of this supplement as they relate to maintenance of an automobile. 8. What advantages does preventive maintenance have over breakdown maintenance? 9. Explain why having a good preventive maintenance program in place is necessary prior to imple-

menting a lean system.

10. Discuss the relationship between preventive maintenance and quality.

1 The probability that equipment used in a hospital lab will need recalibration is given in the follow- ing table. A service firm is willing to provide maintenance and provide any necessary calibrations for a fee of $650 per month. Recalibration costs $500 per time. Which approach would be most cost-effective, recalibration as needed or the service contract?

PROBLEMS

Number o{ Recalibrations 0 2 3 4

Probability ol 0ccurrenoe .15 .25 .30 .20 .10

) The frequency of breakdown of a machine that issues lottery tickets is given in the following table. Repairs cost an average of $240. A service firm is willing to provide preventive maintenance under either oftwo options: #1 is $500 and covers all necessary repairs, and#2 is $350 and covers any repairs after the first one. Which option would have the lowest expected cost: pay for a1l repairs, service option #1, or service option#2?

Number ol BreakdownVMonth 0 1 2 3 4

Frequency ol 0ccurence .10 .30 .30 .20 .10

I 3. the optimum preventive maintenance frequency for each

time is normally distributed:

Equipment Average Time (days) Standard

betweenBreakdowns Deviation Equipment

each ofthe pieces ofequipment if

Preventive Breakdown Maintenance Cost Gost

4201

8400

c850

20

30

40

2

3

4

A201

B400

c850

$300 $2,300 $200 $3,500 $530 $4,800