MAINTENANCE OF MACHINE TOOLS (SSK)

 Maintenance refers to the regular, planned activities carried out to keep equipment, machines, buildings, or vehicles in good working condition and to prevent failures.

Examples of maintenance:

  • Cleaning and lubrication of machines
  • Tightening nuts and bolts
  • Replacing worn-out parts before failure
  • Regular servicing of vehicles
  • Checking electrical connections
  • Preventive inspections

Purpose of maintenance:

  • Increase equipment life
  • Reduce breakdowns
  • Improve safety
  • Maintain efficiency and performance
  • Reduce maintenance costs over time

Types of Maintenance

  1. Preventive Maintenance – Scheduled maintenance performed before a failure occurs.
  2. Predictive Maintenance – Maintenance based on equipment condition using monitoring techniques.
  3. Corrective Maintenance – Repairs or modifications to correct identified faults.
  4. Breakdown Maintenance – Maintenance performed only after equipment has failed.

Repairs are the activities performed to restore a damaged or failed machine, equipment, or system to its normal operating condition after a fault or breakdown has occurred.

Examples of repairs:

  • Replacing a damaged motor
  • Repairing a broken pipe
  • Fixing an electrical short circuit
  • Replacing a punctured tyre
  • Repairing a leaking pump

Purpose of repairs:

  • Restore normal operation
  • Eliminate faults
  • Minimize downtime
  • Ensure safe operation

Difference Between Maintenance and Repairs

MaintenanceRepairs
Planned and preventiveUnplanned or corrective
Done before failureDone after failure
Prevents breakdownsRestores equipment after breakdown
Lower long-term costOften higher due to emergency work
Improves equipment reliabilityRestores equipment functionality

Simple Example

Consider a car:

  • Maintenance: Changing engine oil, checking tyre pressure, replacing air filters, and regular servicing according to the schedule.
  • Repair: Replacing a failed battery, fixing a damaged engine, repairing the brakes after they fail, or replacing a broken clutch.

In short, maintenance prevents problems, while repairs fix problems after they occur.

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