This document discusses various tools used for linear measurement in mechanical engineering. It describes direct and indirect measurement tools like scales, calipers, micrometers, and potentiometers. Specific tools are defined, including vernier calipers, height gauges, depth gauges, and micrometers. Images and brief descriptions of vernier calipers, inside and outside micrometers, depth micrometers, bench micrometers, and screw thread micrometers are provided. The document serves to introduce students to common linear measurement instruments.

1. Linear Measurements
Subject: MMM
Semester: 4th
Division: FX
Branch: Mechanical
Prepared By:
1. Vivek Aghara (140030119001)
2. Akash Ambaliya (140030119003)
Atmiya Institute of Technology & Science Gujarat Technological University

2. LINEAR MEASUREMENT
• The term linear measurement is applied to the
measurement of length , diameter , thickness , internal and
external dimensions.
• There’re 2 types of it..
Direct
Indirect

3. List of Linear Measurement
Instruments
• Architect's scale
• Calliper
• Engineer's scale
• Feeler gauge, used in metal working to measure size of
gaps
• Gauge blocks
• Gunter's chain
• Micrometre
• Opisometer or curvimeter
• Pacing (surveying)

4. List of Linear Measurement
Instruments
• Measuring rod
• Ruler
• Stadimeter
• Surveyor's wheel
• Tape measure
• Yard stick
• Meter stick
• Screw Gauge

5. STEEL RULE
• It is a line measuring instruments.
• It is made form hardened stainless steel.
• They are available in 150,300,600.1000 mm.
• Least count is 0.5 mm.

6. VERNIER CALIPER
• Suitable to measure diameter of circular parts.
• Accuracy is 0.02 mm.
• It is made from alloy steel.
• Consist main scale, vernier scale , depth bar ,internal and
external measuring jaws.

7. VERNIER HEIGHT GAUGE
• Used to measure the height,
and scribing lines on
components.
• Principle is similar to vernier
caliper.
• Least count is 0.02.

8. VERNIER DEPTH GAUGE
• Used to measure the
depth of holes ,slots
etc.
• Principle is similar to
vernier caliper.
• Least count is 0.02.

9. MICROMETER
• Its accuracy is 0.01.
• For each revolution of
thimble the spindle
advances a distance
equal to the pitch.
• Different types are
outside , inside , screw
thread, depth gauge.

10. POTENTIO METER
• It is an electromechanical device.
• Consist of a variable resistive element , slider and circuitry.
• Movement of the slider over the resistive element causes
the change in resistance.

11. Images of various
linear
measurement
devices

12. DIGITAL VERNIER
DEPTH GAUGE

13. OUTSIDE MICROMETER

14. INSIDE
MICROMETER

15. DEPTH
MICROMETER

16. BENCH MICROMETER

17. DIGITAL
MICROMETER

18. SCREW THREAD MICROMETER

19. DIAL BORE GAUGE

20. Thank You…