Angular Metrology

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Anand K Bewoor & Vinay A Kulkarni METROLOGY & MEASUREMENT 2009 Tata McGraw-Hill Education

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PROPRIETARY MATERIAL. 2009 The McGraw-Hill Companies, Inc. All rights reserved. No part of this PowerPoint slide may be displayed, reproduced or distributed in any form or byany means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course

preparation. If you are a student using this PowerPoint slide, you are using it without permission.

METROLOGY & MEASUREMENT

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Anand K Bewoor & Vinay A Kulkarni


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Chapter 7

Angular MetrologyAngular Metrology


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Checking of surfaces ends with angular metrologyProf. A P Deshmukh, Production Engineering Dept., D Y Patil College of Engineering, Pune

ANGULAR MEASUREMENTTHEN AND NOW

In ancient ages, angular measurement was used for setting up direction while traveling.

Sailors on the high seas completely relied upon their prismatic compasses for finding out a

desired direction. Today, precise angular measurements help in the navigation of ships and

airplanes. They are also used in land surveys, in astronomy for computing distances between

stars and planets, measuring the distance of air travel by projection, identifying the positionsof flying objects, and so on.

As an angle is the measure of the opening between two lines, absolute standards are not

required. The circle obtained by rotating a line can be divided into sixty parts to form a

degree, which can be further subdivided into minutes and seconds. This serves as essential

part of linear measurement.

New age production methods demand for precise interchangeable parts and assemblies toincrease the reliability of a product. The helix angle of a shaving cutter derives the surface

finish of the product by defining its grain flow on the face. The normal pressure angle of the

gear decides the quality of the gear to cater to the needs of DIN/ISO/AGMA tolerances. The

contacting angle of the probe with the surface decides the quality of measurement obtained

by CMM. Various types of measuring instruments have different kinds of attachments set at

appropriate angles for extensive modular systems. The applications of angular

measurements are versatile and are essential if the linear measurement values are notsmaller.


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Angular Metrology