Engineering Drawing For ITI
In industries, there are many objects having irregular surfaces. These irregular surfaces are not parallel to the regular planes of projection. They are inclined to both the principal planes i.e. Horizontal plane (H.P) and Verticle plane (V.P).
We can not see the true shape and sizes of these irregular surfaces in any of the three principle views. i.e. Front view, top view, and Side view.
Engineering Drawing ITI 1st Year
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| Engineering Drawing For ITI |
Projection box showing projection on the auxiliary plane
This imaginary projection plane is called an auxiliary plane and the orthographic view obtained on it called an auxiliary view. These views are often found application in technical drawings.
Auxiliary View :
The object having inclined faces which are not parallel to any of the three principal planes of projection, require the auxiliary view to show the true shape of such features. The auxiliary view is arranged as through the auxiliary planes were into the plane of the paper by considering it hinged to the plane with which it is perpendicular, as shown in Fig.
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| Engineering Drawing For ITI |
The relative position of auxiliary view
The auxiliary plane used must always be set up perpendicular to one of the principal planes.
An auxiliary plane perpendicular to the HP (Horizontal Plane) and inclined to the VP (Verticle plane) is called auxiliary vertical plane or AVP.
ITI electrician engineering drawing question paper
Projection on an AVP is called auxiliary front view. The auxiliary plane is denoted by XYZ and can be located at any convenient distance.
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| Engineering Drawing For ITI |
The relative position of AVP in first angle projection
First angle projection
An auxiliary plane perpendicular to V.P (verticle plane) and inclined to the H.P (Horizontal plane) parallel to the inclined face of the object is called auxiliary inclined plane (AIP). The view or projection obtained on this plane is called the auxiliary top view.
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| Engineering Drawing For ITI |
The relative position of AIP in first angel projection
Engineering Drawing For ITI
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| Engineering Drawing For ITI |
locating finger Toggle lover
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| Engineering Drawing For ITI |
Index slide Chuck jaw
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| Engineering Drawing For ITI |
Frame Guide Cut-off Holder
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| Engineering Drawing For ITI |
Counter Bearing Bracket
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| Engineering Drawing For ITI |
Locating V-Block Control Block
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| Engineering Drawing For ITI |
Truck Wheel Column Support
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| Engineering Drawing For ITI |
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| Engineering Drawing For ITI |
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| Engineering Drawing For ITI |
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| Engineering Drawing For ITI |
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| Engineering Drawing For ITI |
Rules for Drawing Auxiliary Views :
- In the first angle, the method of projection, the plane of projection is always located behind the object with respect to the observer.
- The objects are usually assumed to be resting on the Horizontal plane and the line of intersection of a vertical plane and Horizontal Plane is called XY line.
- X1 Y1 denoted the intersection of an auxiliary plane and the principle plane to which it is perpendicular.
- As the XY line is normally the reference line for drawing principal view and X1 Y1 will be the reference line for drawing auxiliary view.
- If the object is symmetrical about the centerline, use the centerline for drawing auxiliary view. Here draw the auxiliary plane perpendicular to the centerline.
- If the object is a or unsymmetrical about a centerline in the principle view, then the auxiliary plane is drawn parallel to edge view or inclined face in the principle view.
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