TAPER MEASUREMENTS

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• Q1: What are Gauge Blocks or Slip Gauges?
  Ans: Gauge blocks or slip gauges are precision measuring tools with very accurate sizes used as standards for measurement.
• Q2: State the uses of Gauge Blocks or Slip Gauges.
  Ans: Uses are:

  • ➔ Checking accuracy of measuring instruments
  • ➔ Setting dimensions
  • ➔ Calibration work
  • ➔ Precision measurement
• Q3: State the classification of Gauge Blocks or Slip Gauges according to their method of manufacturing.
  Ans: Classification based on manufacturing are:

  • ➔ Cohesive Type
  • ➔ Wring Together Type
• Q4: What are Cohesive Type Gauge Blocks or Slip Gauges?
  Ans: Cohesive type gauge blocks stick together due to molecular attraction between their surfaces.
• Q5: What are Wring Together Type Gauge Blocks or Slip Gauges?
  Ans: Wring together type gauge blocks are joined by sliding them together so that they stick firmly due to adhesion.
• Q6: State the Sequence of processes of Gauge Blocks.
  Ans: Sequence of processes are:

  • ➔ Cutting
  • ➔ Heat treatment
  • ➔ Grinding
  • ➔ Lapping
  • ➔ Polishing
• Q7: State the requisites of good Gauge Blocks.
  Ans: Requisites are:

  • ➔ High accuracy
  • ➔ Wear resistance
  • ➔ Good surface finish
  • ➔ Ability to wring easily
• Q8: State the classification of Gauge Blocks or Slip Gauges according to Tolerances.
  Ans: Classification based on tolerance are:

  • ➔ AA Grade (Master)
  • ➔ A Grade (Reference)
  • ➔ B Grade (Working)
• Q9: What are “AA” Master Gauge Blocks?
  Ans: AA grade gauge blocks are master standards with the highest accuracy used in laboratories.
• Q10: What are “A” Reference Gauge Blocks?
  Ans: A grade gauge blocks are used for reference and calibration purposes in inspection work.
• Q11: What are “B” Working Gauge Blocks?
  Ans: B grade gauge blocks are used for general workshop measurements and routine work.
• Q12: What are Gauge Blocks Sets?
  Ans: Gauge block sets are a collection of gauge blocks of different sizes used to build required dimensions.
• Q13: How do you select a Gauge Block for a required Dimension?
  Ans: Select gauge blocks by combining different sizes.
  Choose minimum number of blocks.
  Arrange them to achieve the required dimension.
• Q14: How do you wring Gauge Blocks together?
  Ans: Gauge blocks are wrung by sliding one block over another.
  Apply slight pressure to make them stick firmly.
• Q15: What is the correct method of wringing Gauge Blocks together?
  Ans: Clean the surfaces properly.
  Place blocks at right angle.
  Slide and rotate gently.
  Apply light pressure until they stick.
• Q16: State the application of Gauge Blocks.
  Ans: Applications are:

  • ➔ Calibration of instruments
  • ➔ Precision measurement
  • ➔ Tool setting
  • ➔ Inspection work
• Q17: State the precautionary measures for Gauge Blocks.
  Ans: Precautions are:

  • ➔ Keep clean and dry
  • ➔ Avoid scratches
  • ➔ Handle carefully
  • ➔ Store properly after use
• Q18: State the grades of Gauge Block.
  Ans: Grades of gauge blocks are:

  • ➔ AA Grade
  • ➔ A Grade
  • ➔ B Grade
• Q19: What is a Sine Bar?
  Ans: A sine bar is a precision instrument used to measure angles accurately with the help of slip gauges.
• Q20: What is the Working Principle of a Sine Bar?
  Ans: It works on the sine principle:
  sinθ = Opposite / Hypotenuse
  
  Height of slip gauges / Length of sine bar = sinθ
• Q21: State some uses of a Sine Bar.
  Ans: Uses are:

  • ➔ Measuring angles
  • ➔ Setting angles for machining
  • ➔ Inspection work
• Q22: What is the size of a Sine Bar?
  Ans: Standard sizes of sine bar are:
  100 mm, 200 mm, and 300 mm.
• Q23: State some limitations of a Sine Bar.
  Ans: Limitations are:

  • ➔ Not suitable for large angles
  • ➔ Requires careful setup
  • ➔ Time-consuming
  • ➔ Needs slip gauges
• Q24: State the precautionary measures for Sine Bar.
  Ans: Precautions are:

  • ➔ Keep surfaces clean
  • ➔ Handle carefully
  • ➔ Use correct slip gauges
  • ➔ Avoid shock or damage
• Q25: Who invented the Sine Bar?
  Ans: The sine bar was invented by William Taylor.
• Q26: Who invented the Slip Gauge?
  Ans: Slip gauges were invented by Carl Edvard Johansson.