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.
