Theory of operations_rev_02

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1. Theory of Operations 2. Theory of Operation ã Definition: The theory of operation is a description of how a device, system, or machine is supposed to work ã It…
Transcript
  • 1. Theory of Operations
  • 2. Theory of Operation • Definition: The theory of operation is a description of how a device, system, or machine is supposed to work • It will describe the purpose of a machine or system’s various components and how they interact to deliver quality output • It is often included in documentation - Maintenance or service documentation - User Manual Description of how a device, system or machine is supposed to work
  • 3. Theory of Operation - Aids troubleshooting - Provides the troubleshooter with a mental model of how the system is supposed to work - The troubleshooter can then more easily identify discrepancies, to aid diagnosis of problem Ever think a machine’s component can be disabled and not affect performance? Aids in diagnosis of the problem
  • 4. Key Components of an Operations/Maintenance Manual • Equipment Description • Description of Components • Diagram and Parts Listing • Operating Instructions • Adjustments • Troubleshooting Guide • Cleaning and Inspection Procedures Theory of Operations
  • 5. Equipment Description Example The Rayovak model 1234 flashlight is designed to provide economical and portable light to aid in completing inspection, maintenance and repair activities in places where ambient lighting is poor. Proper operation and maintenance of your Rayovak flashlight is essential to ensure long-term reliability.The Rayovak model 1234 flashlight is composed of the three subsystems shown below: Description of how a device, system or machine is supposed to work
  • 6. Sub System Theory Example Step 1 – The operator presses the slide switch towards the lamp assembly. Step 2 – The energizing slide contact connects with the lamp circuit contact. Step 3 – The shape of the energizing slide contact creates a force fit with the lamp circuit contact, keeping the slide switch in the ‘on’ position until moved by the operator. Step 4 – The de-energizing slide contact remains in contact with the battery circuit contact through the full range of motion of the switch. Step 5 – Electrical current at 1.5v (max) and 900mA travels from the battery circuit contact, through the slide switch and into the lamp circuit contact. Aids in diagnosis of the problem
  • 7. Example of Theory of Operation – Overall Bartelt Description of how a device, system or machine is supposed to work
  • 8. Example of Theory of Operation – Subassembly Starmatic Labeler Provides the troubleshooter with a mental model MACHINE INFEED •Bottles enter the machine by conveyor in single file. • Depending on line conditions, bottles will either be held back by the bottle stop to accumulate or will pass by the bottle stop into the feedscrew. • The feedscrew separates bottles, providing proper spacing to be accepted by the infeed star. • The infeed star then transfers bottles onto the bottle table where they are positioned on bottle plates and held firmly in place by overhead centering bells.
  • 9. Example of Theory of Operation – Overall Probat Jupiter Tangential Roaster Description of how a device, system or machine is supposed to work
  • 10. Functional Mapping / Analysis If you don’t have a good Theory of Operations, how do you get it? One way is through Functional Mapping / Analysis Functional Mapping can be used to clarify the functions of your equipment It provides a means of formally analyzing the equipment in an FMEA Functional Mapping can be used to clarify the functions of your equipment
  • 11. Functional Mapping Continued For each function ask the question: •Is it necessary? • Is it Useful? • Is it Value Added? Identify all physical objects in the system using your existing knowledge of the structure Draw arrows between all objects that represent what action is being done Identify all physical objects in the system
  • 12. Next Steps Create a Theory of Operations Manual
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