These 12 divisions occupy equal space as 23° on the main scale. These are marked 0-60 mins of the arc so that each division equals 1/12 of 60, that is 5 min of arc. It has 12 divisions on each side of the center zero. The figure shows on the main scale are graduated in degrees of arc. Read Also: What is Sine Bar? Working Principle, Construction, Formula, Application Main Scale & Vernier Scale Reading It is designed to allow the user to move the blade around, especially with a higher degree of accuracy, when trying to create the final alignment to measure the object. It is measured in “minutes” and is read second. The vernier scale is also called a “secondary scale” and the angle can be measured with higher accuracy. The main scale is also called a “primary scale” of this protractor, which has to measure angles in (as usual) degrees and is read first. Magnifying GlassĪ bevel protractor comes with a magnifying glass, which helps when reading angles more precisely. When measuring the angle, the base is placed under the side of the angle. Parts of a Bevel Protractorįollowing are the main parts of a bevel protractor: The adjustable blade is attached to a rotating member that moves its microscope. A small microscope has been fitted through which circle graduation can be seen. Mechanical Bevel ProtractorĪ circle divided at an interval of 1.0 mins in the entire circle is fitted on the inside of the body. The following figure shows the nomenclature of both types of bevel protractors. Read Also: Vernier Caliper: Parts, Types, Working Principle, Least Count, Errors Types of Bevel Protractor Universal bevel protractors are also utilized by toolmakers, as they measure angles by mechanical contact they are classified as mechanical protractors. It has broad application in mechanical and architectural however with the availability of modern drawing software like CAD the tool is less likely used in that sphere. Sometimes vernier scales are attached to give more accurate readings. A bevel protractor is a graduated circular protractor it has a pivoted arm used for measuring or marking off angles. More advanced protractors, like Bevel Protractors, have one or two swinging arms, which help in measuring the angle. Some protractors are half-discs that have existed since ancient times. The units of measurement used are normally degrees. In geometry, a protractor is a circular or semicircular instrument used for measuring an angle or a circle.
0 Comments
Leave a Reply. |