Angular measurements
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This document discusses angular measurement instruments. It defines angles and describes common units of angular measurement like degrees, minutes and seconds. The main types of angular measuring instruments discussed are line standard devices like protractors, face standard devices, and instruments for measuring inclines like spirit levels and clinometers. Specific instruments described in more detail include bevel protractors, sine bars, angle comparators, and optical bevel protractors. Applications of bevel protractors like checking angles of V blocks and measuring acute angles are also mentioned.
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The document discusses various instruments used to measure angles, including protractors, bevel protractors, sine bars, sine centers, angle gauges, spirit levels, and clinometers. A vernier bevel protractor is described in detail, including how it can be used to measure both acute and obtuse angles with vernier scales that allow for measurements in minutes of an arc. Sine bars are limited to measuring angles less than 45 degrees, while sine centers and angle gauges provide more flexibility in measuring various angles. Spirit levels and clinometers can be used to measure angles relative to the horizontal plane.
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The document provides information about various linear and angular measurement instruments used in mechanical engineering. It describes instruments such as vernier calipers, micrometers, slip gauges, limit gauges including plug, ring and snap gauges, comparators, sine bars and bevel protractors. It explains the working, applications and procedures to measure linear dimensions and angles using these tools with high precision.
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The document provides information about various linear and angular measurement instruments used in mechanical engineering. It describes instruments such as vernier calipers, micrometers, slip gauges, limit gauges including plug, ring and snap gauges, comparators, sine bars and bevel protractors. It explains the working, applications and procedures to measure linear dimensions and angles using these tools with high precision.
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This document discusses various tools used to measure angles precisely in engineering workshops. It begins by explaining the sexagesimal system of defining angular units in degrees, minutes and seconds. It then describes the protractor as a basic tool that can measure angles to a least count of 1° or 1/2°. The document goes on to explain how a sine bar works by measuring the sine of an angle using the relationship of the height difference between two rollers to the distance between their centers. It notes guidelines for proper use of a sine bar such as only using it for angles under 45° and with a surface plate and slip gauges. Finally, it briefly introduces the sine center for measuring conical workpieces held between centers, and
Linear measurements
Please refer this file just as reference material. More concentration should on class room work and text book methodology.
Linear measurements
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Angular measurements
- 1. ANGULAR MEASUREMENTS Dr.S.BENJAMIN FRANKLIN Associate Professor Gr1 Department of Mechanical Engineering Sri Ramakrishna Institute of Technology
- 2. ANGULAR MEASUREMENTS • Angle is defined as the opening between two lines which meet at a point. • If circle is divided into two 360 parts, then each part is divided into degree.If each degree is subdivided into 60 parts called minutes, and each minutes is subdivided into 60 parts called seconds.
- 3. Types of angular measuring instruments • Line standard angular measuring devices Protractors Universal bevel Protractors • Face standard angular measuring devices • Measuring of inclines • Sprit level • Clinometers
- 4. Types of angular measuring instruments •Bevel protractors •Sine bar Angle Comparators •Sine centre •Angle gauges • Clinometers • Interferometers,Autocolli mators and Optical flat
- 5. Bevel Protractors • Measure the angle between the two faces of a component. • Vernier bevel protractor • Universal bevel protractor • Optical bevel protractor
- 9. Applications of bevel protractors • Checking angle of a V block • Measuring acute angle of the component • Checking in inside bevelled face of a ground surface
- 10. Measurement of incline SPIRIT LEVEL CLINOMETER
- 11. CLINOMETER • A clinometer is a special case of application o spirit level for measuring • In the vertical plane, the incline of a surface in relation to the horizontal plane • The main functional element of a clinometer in the sensitive vial mounted on a rotatable disc which carries a graduated ring with its a axis supported in the housing of the instrument