# Types of Scales Used in Engineering Drawing

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Let’s begin with the fundamentals-

## What is Scale?

A scale is the ratio of the linear dimension of an object’s element as shown in a drawing to the actual dimensions of the same object’s element.

Or, A scale is a measuring device that is used to determine a person’s weight. The most prevalent scales found in our environment are digital scales. Now, Let’s move to the type of engineering drawing scales.

## Types of Scales in Engineering Drawing-

There are several types of Engineering drawing scales. They are-

1. Plain Scale
2. Diagonal Scales
3. Comparative Scale
4. Vernier Scale
5. Scale of Chords ### Plain Scale-

A plain scale is just a line that has been divided into a specific number of equal pieces, the first of which has been further subdivided into smaller portions. It can be used to represent two units, a unit, or a fraction of a unit.

Plain scale is used in engineering drawings to measure up to two units in a row. For instance, metre and decimetre, feet and inches, and so on. ### Diagonal Scale-

Three units are represented by a diagonal scale. They are-

• Main Unit
• Sub-Unit
• Sub-Division

The diagonal primary is used to divide a small unit of a plain scale. The scale is called the diagonal scale because the third unit of scale is determined using this diagonal.

When three successive units of measurement are required, a diagonal scale is utilised. The measurement accuracy of a diagonal scale is higher than the Plain scale. For instance- Metre, decimetre, and centimetre. ### Comparative Scale-

A comparison scale is a pair of scales with the same representative fraction but graduated to read measurements in several unit systems. Depending on the situation, comparative scales can be built as plain or diagonal scales.

For Instance, Through a comparative scale- a map or graphic made on a scale reading miles and feet can be estimated directly in kilometres and hectometers. ### Vernier Scale-

A vernier scale is a metric scale that measures three successive units. As a result, the vernier scale’s measurement accuracy is equivalent to the diagonal scale. In engineering drawings, vernier scales are used to show distances inside a unit and its two significant subdivisions.

The vernier scale is most commonly found on length measuring instruments including vernier callipers, screw gauges, and micrometres. ### Scale of chords-

In the case of lack of a protractor, a chord scale can be used to determine or establish the required angle. The structure is based on chord lengths of angles measured over an identical arc. Wrapping Up-

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