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BASIC INSPECTION AND PROCEDURES

BASIC INSPECTION AND PROCEDURES. CHAPTER 2. GMI | Production Technology. BASIC INSPECTION AND PROCEDURES. Learning Objectives Define and differentiate measuring and gauging List the advantages of measuring & gauging List the disadvantages of measuring & gauging

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BASIC INSPECTION AND PROCEDURES

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  1. BASIC INSPECTION AND PROCEDURES CHAPTER 2 GMI | Production Technology

  2. BASIC INSPECTION AND PROCEDURES • Learning Objectives • Define and differentiate measuring and gauging • List the advantages of measuring & gauging • List the disadvantages of measuring & gauging • Identify various types of gauges • Describe direct, indirect and comparative measurements • Explain factors of consideration in selecting testing appratus • Define the term calibration, traceability & measurement error • Identify the sources of measurement error • Identify the root cause of the problems • Explain the needs for calibration, inventory and care of apparatus GMI | Production Technology

  3. BASIC INSPECTION AND PROCEDURES • Testing and Inspection Procedures GMI | Production Technology

  4. BASIC INSPECTION AND PROCEDURES • Measuring Measured value is read off directly from the measuring instrument GMI | Production Technology

  5. BASIC INSPECTION AND PROCEDURES • Gauging True value is unknown, only determine ‘good’ or ‘bad’ parts only GMI | Production Technology

  6. Measuring vsGauging

  7. BASIC INSPECTION AND PROCEDURES • Types of Measurement GMI | Production Technology

  8. Types of Measurement (cont) Indirect Measurement • Measure value obtain using intermediary • Measurement directly use instrument, value determine by math (density, volume)

  9. Types of Measurement (cont) Comparative measurement • Comparison between standard/either known value. Dial gauge Gauge block Measure workpiece

  10. BASIC INSPECTION AND PROCEDURES • Factors in selecting Testing Instrument • The Rule of 10 • Repeat accuracy • Stability • Magnification • Resolution(sensitivity) • Inspection Cost – maintaining & installing GMI | Production Technology

  11. BASIC INSPECTION AND PROCEDURES GMI | Production Technology

  12. BASIC INSPECTION AND PROCEDURES • Calibration • Definition : • a periodical act of checking/comparing two measuring instruments, one of which is traceable to national standards • Purpose : • to detect any discrepancies in accuracy and adjust it to bring it within its tolerance for accuracy GMI | Production Technology

  13. BASIC INSPECTION AND PROCEDURES • Calibration • Inventory and Classification • Systematic approach of calibration control • Calibration Masterlist • Record card • Equipment Marking with Control number • Calibration sticker GMI | Production Technology

  14. Calibration (cont)

  15. BASIC INSPECTION AND PROCEDURES GMI | Production Technology

  16. BASIC INSPECTION AND PROCEDURES • Calibration • Function of Calibration room • To detect deteriorations of instruments and provide services for rectification or adjustments • To ensure that newly purchased instruments are within the specified limits • To keep instruments in proper condition to maintain accuracy • Centralized location for gauge issuing • Place for development and verification of test methods • Acceptance inspection prior to production • Room temperature 20+ 1°C and humidity at 55%+3. GMI | Production Technology

  17. BASIC INSPECTION AND PROCEDURES • Care of Measuring Instrument • Calibrate the instrument periodically before use • Do not use instruments as tools • Protect the instruments from dust, rust, shock and wear • Store the instruments in a proper place • Do not store the instruments with other tools • Avoid rough handling and dropping the instruments GMI | Production Technology

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