1. Chapter 03- Angular Measurements PRESENTED BY Ms. M.R. Zade
Pimpri Chinchwad Polytechnic, Nigdi.
Chapter 03- Angular Measurements PRESENTED BY Ms. M.R. Zade

2. C505.3
Measure angle of a given component using angle measuring instruments.

3. Angular Measurement
Circles are divided into 360 equal parts, each being a degree.
Each of these degrees can be evenly divided into 60 equal parts. These parts are called minutes.
These minutes can be evenly divided into 60 equal parts. These parts are called seconds.

4. Types Of Tools:- Most common tools:- Simple Protractor Combination Set
Universal bevel protractor

5. Angular Measure Tools

6. Protractor
Whole degree increments

7. Multi-Use Gauge
Pre-set positions for 45 and 90 degrees, 59 degree drill point angle, and whole degree increments.

8. Multi-Use Gauge
Pre-set position for 90 degrees.

9. Multi-Use Gauge
Pre-set position for 45 degrees.

10. Multi-Use Gage
Measuring 59 degree drill point angle.

12. Protractor Head
Whole degree increments

13. Protractor
Built-in Spirit Level

14. Protractor
Angular Measure with Protractor Head

15. Transfer-type Protractors

16. Universal Bevel Protractor
Precision angles to within 5' (0.083º)
It Consists of :-
Base
Vernier scale
Protractor dial
Sliding blade
Dial clamp nut

17. Vernier Protractor Used to measure obtuse angle (90º-180º)
Acute-angle attachment fastened to protractor to measure angles less than 90º
Main scale divided into two arcs of 180º
Scale divided into 12 spaces on each side of 0
If zero on vernier scale coincides with line on main: reading in degrees

18. Reading a Vernier Protractor
Note number of whole degrees between zero on main scale and zero on vernier scale
Proceeding in same direction, note which vernier line coincides with main scale line
Fourth
Multiply number by 5' and add to degrees on protractor dial
50º
4 x 5'= 20'
Reading =
50º 20'

19. Sine Bars
Used when accuracy of angle must be checked to less than 5 minutes
Consists of steel bar with two cylinders of equal diameter fastened near ends
Centers of cylinders exactly 90º to edge
Distance between centers usually 5 or 10 inches and 100 or 200 millimeters.
Made of stabilized tool hardened steel

20. Sine Bar

21. Sine Bars

22. TRY SQUARE
A try square is a wood working or a metal working used for marking and measuring a piece of wood. The square refers to the tool's primary use of measuring the accuracy of a right angle (90 degrees); to try a surface is to check its straightness or correspondence to an adjoining surface. A piece of wood that is rectangular, flat, and has all edges (faces, sides, and ends) 90 degrees is called four square.

24. Dial Gauge
The dial gauge also known as the indicating gauge and used for checking concentricity of rods, holes and flatness of surfaces to accuracy of 0.01mm. These gauges are widely used on lathe.

25. Clinometer
A clinometer is an instrument used for measuring angle relative to the horizontal plane.

26. Type Of clinometer
Vernier Clinometer
Micrometer
Dial
Pendulum
Optical

27. THANKS