What Is Engineering Drawing? | What is Technical/Engineering Drawing | Introduction to Technical Drawing|VTU notes

   

What is Engineering/Technical Drawing?

    

             Engineering drawing, most usually referred to as engineering graphics, is the art of manipulation of designs of a variety of components, especially those associated to engineering. And it is the graphical language of engineer's  it is used for effective communication among engineer's  to read drawings and this  it consists of various rules and regulatios set by BUREAU OF INDIAN STANDARD (BIS).  It primarily consists of sketching the actual solid geometry or descriptive geometry in the form of points, lines, planes and solid  components on a flat surface in such a way that their relative position and true shape can be determined, for example a machine, with its exact dimensions. The scale of dimensions is suitably adjusted so as to desirable fit within the contours of the drawing sheet. This language is used in all branches of engineering according to their requirements.

In some cases, depending in the discipline, there are areas of particular focus, such as in the case of Structural Engineering. Another consideration is in regards to the devices of measure used; these could be not only Metric or Imperial, but additionally the way these are noted is relevant, because it will also reflect the precision of a dimension.

Technical drawing, is the most vital aspect of mechanical engineering, as it is the fundamental need to develop the graph and assembly of a machine. While the interpretation of a component in terms of sketching can be done in quite a number methods, related to Descriptive Geometry.

Engineering drawing, most usually referred to as engineering graphics, is the art of manipulation of designs of a variety of components, especially those associated to engineering. It primarily consists of sketching the actual component, for example a machine, with its exact dimensions. The scale of dimensions is suitably adjusted so as to desirable fit within the contours of the drawing sheet.

In some cases, depending in the discipline, there are areas of particular focus, such as in the case of Structural Engineering. Another consideration is in regards to the devices of measure used; these could be not only Metric or Imperial, but additionally the way these are noted is relevant, because it will also reflect the precision of a dimension.

Engineering drawing, is the most vital aspect of mechanical engineering, as it is the fundamental need to develop the graph and assembly of a machine. While the interpretation of a component in terms of sketching can be done in quite a number  of methods, related to Descriptive Geometry.

Method of Projection:

If straight lines are drawn from the various points on the shape of an object to meet a plane then the object is said to be projected on that plane. The figure that formed by joining the points in correct sequence at which the lines meets the plane, is called the projection of the object and the lines are called Projectors.

In engineering drawing following three method of projection is used commonly:

1-Orthographic Projection:      

In this method the object is positioned in space in such a way that the front view of it is captured in the vertical plane, and the top view of the same, is captured in the horizontal plane i.e, the different veiws are shown in different planes . The projections of the object are perpendicular with the planar screen, and hence, the name 'orthographic'.

2-Perspective Projection: 

This is a easy technique of drawing an object as how one views it. The observer's eye position, height, and the distance from the object, all influence the outcome of the drawing. Two sub-methods are adopted for this projection technique, namely, Visual Ray Method and Vanishing Point Method.

3-Isometric Projection: 

This form of projection offers the total detail of the component under consideration. The primary principle behind isometric projection is that it involves the consideration of three axes that are inclined to each different making equal angles (thus the name since iso- means equal) with each different (120 deg). And in this type of projections all the different veiws of the object is shown on the same plane.This is followed by transfer of actual dimensions to the isometric scale involving some simple trigonometric calculations.

In regards to projections, it is really worth note that different much less traditional projections do exist, such as dimetric and trimetric projections, and these are exceptional by way of the angles used in distinction to 30 levels for isometric projections. However, the most frequent and prevalent is the orthographic projection.

As a realistic way to keep in mind how it works, one may additionally think about searching at a dice in an empty bowl on a table; the dice would have a face parallel to the pinnacle floor of the table. If one would clutch the dice in the bowl and would rock it forward, a one of a kind aspect of the dice would emerge as parallel to the desk top.

Hence, engineering drawing performs a essential position each in manufacture and design, as it no longer solely explains the string of association in a machine, however additionally tells us about the technique to be employed to manufacture the person blocks.

An engineering drawing no longer solely helps bring thoughts and convert standards into reality, an engineering drawing follows standards and conventions to get rid of confusion by way of the the standardization of nomenclature and practices, as a way to absolutely relay the records to the character who knows it when it is read, and very importantly, it shows or recommendations how some thing is going to be manufactured