Measuring instruments-Angular measuring instruments NSQF Level 4 Unit 3 Session-2

 

Angular Measuring Instruments

"Instruments used for measuring the angle are called angular measuring instruments." 

Source:YouTube

Angle is formed by two intersecting lines at the point of intersection. The instruments used for measurement of the angle are:

Protractor: 

Source: Wikimedia Commons 

A protractor is a device for measuring the angle between two intersecting lines. The angle is measured in degrees, and a circle is defined as having 360 degrees of identical size.

Blade protractor: 

Source: Craftmanspace

This is a highly useful and accurate tool for setting bevels, transferring angles, small squaring tasks, and many other applications. Double graduations from 0 - 180° in opposite directions permitting the direct reading of angles and supplementary angles.

Bevel / Combination gauge: 

Source: Tools for working wood

A bevel gauge is an adjustable gauge for setting and transferring angles. The handle is usually made of wood or plastic or steel and is connected to a metal blade with a thumb screw or wing nut. The blade pivots and can be locked at any angle by loosening or tightening the thumb screw.

Universal Protractor: 

Source: zxc.wiki

The universal bevel protractor picks up where the blade protractor leaves off. The universal bevel protractor is designed for precision measuring and layout of angles. The universal bevel protractor is capable of measuring obtuse angles as well as acute angles when accompanied with the correct attachments. Look at Figure below to give you an idea as to the uses of the universal bevel protractor.

Bevel protractor: 

Source: Mechanical Walkins

The main component of the bevel protractor is the main scale. The main scale is graduated into four 90-degree components. The main scale is numbered to read from 0 to 90 degrees and then back from 90 degrees to 0.