What is the difference between type A and type B? One full rotation of adjustable blade increase one division in main scale. It consists of a base plate attached to the main body, and an adjustable blade which is attached to a circular plate containing vernier scale. Its working edge should be flat to within 0.
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While taking a measurement, The Zero line on the vernier scale shows the reading on the main scale, called main scale reading. Actually, Vernier Bevel Protractor can measure up to 5 minutes of the angular measurement only.
Engineering Metrology Questions and Answers – Vernier and Optical Bevel Protractor
It is used to test angle for very close tolerances. A small microscope is fitted through which the circle graduations can be viewed. Journal of Scientific Instruments. All the way we have discussed pgotractor Construction of optical Bevel Protractor, and its working principle, and taking an angular measurement with the optical Bevel Protractor.
Bevel protractor is the simplest instrument for measuring angles.
Working Principle of Optical Bevel Protractor - ExtruDesign
It is very essential that the working edge of the stock be perfectly straight and if at all departure is there, it should be in the form of concavity and of the order of 0. It has a base plate which is attached to the main body. It is about or mm in length, 3 ;rotractor wide. October 29, What is a Spark Ignition Engine? Readings are taken against protracttor fixed index line or vernier by means of an optical magnifying system which is internal with the instrument.
The blade can be locked in any position. An acute angle attachment is provided at the top ; as shown in Fig.
It is used for measuring and laying out of angles accurately and precisely within 5 minutes. It can be readily fitted into body and clamped in any position. Its working edge should be flat to within 0. Which of the following are the types of mechanical bevel protractor? What is the flatness tolerance of acute angle attachment? The scale is graduated as a full circle marked 0—90—0— The protractor dial is slotted to hold a blade which can be rotated with the dial to the required angle and also independently adjusted to any desired length.
The difference between type A and Type B is that type A has a fine adjustment device or acute angle attachment whereas type B is not. It is not provided with acute angle attachment. The vernier can read to 5 minutes of arc in A and B type of mechanical bevel protractor whereas in case of type C, the scale can be read in degrees.
Universal Bevel Protractor Series
protractog If you would like to buy this article, but not online, please contact custserv iop. Blade is moved along the turret. Type D is graduated in degrees and is not provided with either vernier or fine adjustment device or acute angle attachment. There are four types of mechanical bevel protractors i. Angular Measurement and Circular Division Metrology.
This site uses Akismet to reduce spam. To gain access to this content, please complete the Recommendation Form and we will follow up with your librarian or Institution on your behalf. Divided Circles Metrology Previous post: The scale and vernier protracror so arranged that they are always in focus in the optical system.
Fitted inside the mam body. Optical Bevel Protractor is the development of the Vernier Bevel Protractor which has the ability to measure the angles up to 2 minutes.