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TecH Lad
 
Linear and Angular 
Linear and Angular 
Measurement 
Measurement 
?
The Linear Measurement includes 
measurements of length, diameters, 
heights and thickness
?
The Angular measurement includes the 
measurement of angles or tapers
Page 2


TecH Lad
 
Linear and Angular 
Linear and Angular 
Measurement 
Measurement 
?
The Linear Measurement includes 
measurements of length, diameters, 
heights and thickness
?
The Angular measurement includes the 
measurement of angles or tapers
TecH Lad
 
Dimensions 
Dimensions 
?
A very common measurement is that of 
dimensions, i.e., length, width, height of 
an object
?
Dimensions of the measuring instruments 
are classified as follows
? Low resolution devices (up to 0.25mm) 
? Medium  resolution devices (up to 0.025mm) 
? High  resolution devices (less than microns) 
Page 3


TecH Lad
 
Linear and Angular 
Linear and Angular 
Measurement 
Measurement 
?
The Linear Measurement includes 
measurements of length, diameters, 
heights and thickness
?
The Angular measurement includes the 
measurement of angles or tapers
TecH Lad
 
Dimensions 
Dimensions 
?
A very common measurement is that of 
dimensions, i.e., length, width, height of 
an object
?
Dimensions of the measuring instruments 
are classified as follows
? Low resolution devices (up to 0.25mm) 
? Medium  resolution devices (up to 0.025mm) 
? High  resolution devices (less than microns) 
TecH Lad
 
Low resolution devices
Low resolution devices
?
Steel rule
?
Steel rule with assistance of 
? Calipers
? Dividers  &
? Surface gauges
?
Thickness gauges 
Page 4


TecH Lad
 
Linear and Angular 
Linear and Angular 
Measurement 
Measurement 
?
The Linear Measurement includes 
measurements of length, diameters, 
heights and thickness
?
The Angular measurement includes the 
measurement of angles or tapers
TecH Lad
 
Dimensions 
Dimensions 
?
A very common measurement is that of 
dimensions, i.e., length, width, height of 
an object
?
Dimensions of the measuring instruments 
are classified as follows
? Low resolution devices (up to 0.25mm) 
? Medium  resolution devices (up to 0.025mm) 
? High  resolution devices (less than microns) 
TecH Lad
 
Low resolution devices
Low resolution devices
?
Steel rule
?
Steel rule with assistance of 
? Calipers
? Dividers  &
? Surface gauges
?
Thickness gauges 
TecH Lad
T 
Medium  resolution devices
Medium  resolution devices
?
Micrometer 
?
Micrometer with assistance of 
? Telescoping 
? Extendable ball gauges
?
Vernier calipers 
?
Dial indicators 
?
Microscope 
Page 5


TecH Lad
 
Linear and Angular 
Linear and Angular 
Measurement 
Measurement 
?
The Linear Measurement includes 
measurements of length, diameters, 
heights and thickness
?
The Angular measurement includes the 
measurement of angles or tapers
TecH Lad
 
Dimensions 
Dimensions 
?
A very common measurement is that of 
dimensions, i.e., length, width, height of 
an object
?
Dimensions of the measuring instruments 
are classified as follows
? Low resolution devices (up to 0.25mm) 
? Medium  resolution devices (up to 0.025mm) 
? High  resolution devices (less than microns) 
TecH Lad
 
Low resolution devices
Low resolution devices
?
Steel rule
?
Steel rule with assistance of 
? Calipers
? Dividers  &
? Surface gauges
?
Thickness gauges 
TecH Lad
T 
Medium  resolution devices
Medium  resolution devices
?
Micrometer 
?
Micrometer with assistance of 
? Telescoping 
? Extendable ball gauges
?
Vernier calipers 
?
Dial indicators 
?
Microscope 
TecH Lad
 
High  resolution devices
High  resolution devices
?
Gauge blocks 
?
Gauge block with assistance of 
? Mechanical comparator 
? Electronic comparator 
? Pneumatic comparator 
? Optical flats 
Read More
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FAQs on PPT: Measuring & Gauging Instruments - Manufacturing Engineering - Mechanical Engineering

1. What are some commonly used measuring instruments in mechanical engineering?
Ans. Some commonly used measuring instruments in mechanical engineering include micrometers, calipers, dial indicators, height gauges, and coordinate measuring machines (CMMs). These instruments are used to measure dimensions, distances, angles, and other physical properties of mechanical components.
2. How does a micrometer work and what is it used for in mechanical engineering?
Ans. A micrometer is a precision measuring instrument used to measure small distances or dimensions with high accuracy. It consists of a calibrated screw mechanism and a measuring scale. When the screw is rotated, it moves a spindle towards or away from an anvil, allowing precise measurements to be taken. Micrometers are commonly used in mechanical engineering for measuring the thickness of materials, the diameter of shafts, and the clearance between parts.
3. What is the purpose of a dial indicator in mechanical engineering?
Ans. A dial indicator, also known as a dial gauge or a probe indicator, is used in mechanical engineering to measure small linear distances or displacements. It consists of a needle-like probe connected to a dial that displays the measurement. Dial indicators are often used to check the alignment of machine parts, measure the runout of rotating components, and ensure the accuracy of machining operations.
4. How does a coordinate measuring machine (CMM) work and what are its applications in mechanical engineering?
Ans. A coordinate measuring machine (CMM) is a sophisticated measuring instrument used in mechanical engineering to determine the geometrical characteristics of objects. It works by moving a probe along predefined paths and recording the coordinates of its position. These coordinates are then used to generate a 3D model or analyze the dimensional accuracy of the measured object. CMMs find applications in quality control, reverse engineering, and dimensional inspection of complex components.
5. What is the significance of calibration in measuring and gauging instruments in mechanical engineering?
Ans. Calibration is the process of comparing the measurement values obtained from a measuring or gauging instrument against a known standard to ensure accuracy. In mechanical engineering, calibration is crucial to maintain the reliability and traceability of measurements. It helps identify and correct any deviations or errors in the instruments, ensuring that they provide accurate and consistent results. Regular calibration of instruments is necessary to meet quality standards, minimize measurement uncertainties, and ensure the integrity of engineering processes.
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