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To achieve these objectives, IS 'Code of practice for general engineering drawing' was originally issued in and revised twice in and To see an animated version of this tutorial, please see the Drawing and Drafting section in MIT's Engineering Design Instructional Computer System. (EDICS). a sample question paper,for practice with answers {all figures are drawn to the scale using MS-Word and Prof. Vinay Chidri An alternaing way to CAD.

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Figure 22 - Cross section.

### Engineering drawing

Dimensioning The purpose of dimensioning is to provide a clear and complete description of an object. A complete set of dimensions will permit only one interpretation needed to construct the part. Dimensioning should follow these guidelines.

Definitions and Dimensions The dimension line is a thin line, broken in the middle to allow the placement of the dimension value, diploma engineering drawing arrowheads at each end figure diploma engineering drawing Figure 23 - Dimensioned Drawing.

An arrowhead is approximately 3 mm long and 1 mm wide. That is, the length is roughly three times the width.

An extension line extends a line on the object to the dimension line. The first dimension line should be approximately 12 mm 0.

Extension lines begin 1. A leader is a thin line used to connect a dimension with a particular area figure Figure 24 - Example drawing with a leader.

• Drawing Handout Index

A leader may also be used to indicate a note or comment about a specific area. When there diploma engineering drawing limited space, a heavy black dot may diploma engineering drawing substituted for the arrows, as in figure Also in this drawing, two holes are identical, allowing the "2x" notation to be used and the dimension to point to only one of the circles.

Where To Put Dimensions The dimensions should be placed on the face that describes the feature most clearly. Examples of appropriate and inappropriate placing of dimensions are shown in figure Figure 25 - Example of appropriate and inappropriate dimensioning.

## Engineering drawing - Wikipedia

In order to get the feel of what dimensioning is all about, we can start with a simple rectangular diploma engineering drawing. With this simple object, only three dimensions are needed to describe it completely figure There is little choice on where to put its dimensions.

Figure 26 - Simple Object.

We have to make some choices when we dimension a block with a notch or cutout figure It is usually best to dimension from a common line or surface. This can be called the diploma engineering drawing line of surface. This eliminates the addition of measurement or machining inaccuracies that would come from "chain" or "series" dimensioning.

Notice how the dimensions originate on the datum surfaces. We chose one datum surface in figure 27, and another in figure As long as we are consistent, it makes no difference.

We are just showing the top view.

Figure 27 - Surface datum example. Figure diploma engineering drawing - Surface datum example. In figure 29 we have shown a hole that we have chosen to dimension on the left side of the object.