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It’s probably the easiest tool for determining the angle between two components’ faces. It is made up of a base plate that is attached to the main body, as well as an adjustable blade that is attached to a circular plate with a vernier scale. The movable blade can be fixed in any position and rotates freely around the centre of the primary scale engraved on the instrument’s body. An acute angle attachment is provided at the top to measure acute angles, as shown in the Figures. The base of the base plate is made flat so that it can be set flat on the work. Any angle can be calculated.
Setting up a bevel protractor correctly is essential to ensure accurate angle measurements. Here’s a step-by-step guide on how to set up a bevel protractor: Jones, A (2014). "Concurrent validity and reliability of the simple goniometer iphone app compared with the universal goniometer" (PDF). Physiotherapy: Theory and Practice. 30 (7): 512–516. doi: 10.3109/09593985.2014.900835. hdl: 2328/37026. PMID 24666408. S2CID 28719817. Most protractors measure angles in degrees (°). Radian-scale protractors measure angles in radians. Most protractors are divided into 180 equal parts. Some precision protractors further divide degrees into arcminutes. A protractor divided in centiturns is normally called a " percentage protractor".The identical section is represented as 23° on the Main scale (12 divisions on the vernier scale = 23° on the major scale).
In the case of other types of precision protractors, such as bevel protractors and digital protractors, it is suggested to send such protractors to a traceable calibration laboratory. How Often Do Protractors Need Calibration? At somewhere the divisions on the vernier scale will coincide with the divisions on the Main scale. this reading is noted as the Vernier scale reading. With these values along with the least count of the Vernier bevel protractor, we can calculate the Reading. Parts of Bevel Protractor
How to Read Protractors
The optical bevel Protractor is a development of the Vernier Protractor with the inclusion of an optical magnifying device to achieve greater accuracy and precision in angular measurement for up to 2 minutes. The Vernier Bevel Protractor can only measure angle measurements for up to 5 minutes. Construction of Optical Bevel Protractor Also, Read: Gas Turbine Parts and Functions | Introduction to Gas Turbine Power Plant | Major Parts of Gas Turbine Power Plant | Gas Turbine | The Compressor of Gas Turbine Power Plant | Thermodynamic Cycle of Gas Turbine Power Plant Advantages of Bevel Protractor: For the building of the slip gauges, there is no scientific approach available and it is to be built on the trial and error basis and it is a time-consuming process. With these values along with the least count of the Vernier bevel protractor, we can calculate the Reading. The Vernier scales are fixed on the swivel plate, & it moves along the swivel plate. The Vernier scale gives the remaining angle in minutes. There are 60 minutes in 1 degree. It is added to the Vernier scale bevel protractor to increase the accuracy of angle measurement.
The Vernier scale has 12 divisions on each side of the center zero. (It means there are 24 divisions on the vernier scale) The 12 divisions are denoted as 60 min on the vernier scale (Like this 15, 30, 45, 60). That means 12 division = 60 minutesThe bevel protractor is useful for establishing and testing the angles to very close tolerances. It reads to 5 arcminutes and can also measure angles from 0 degrees to 360 degrees. where 'h' is the height of the slip gauges placed below the roller and 'L' is the length of Sine bar i.e. L=200 mm or 300 mm. The swivel plate rotates on the dial. This swivel plate has a vernier scale that is integrated into it. #2. Magnifying Glass
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