ENGINEERING DRAWING

Q.The projections of different points are shown in Fig. Define the position of the points in relation to the reference planes. The distances marked are in millimeters.

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Q.The projections of different points are shown in Fig. Define the position of the points in relation to the reference planes. The distances marked are in millimeters. SOLUTION: (i) Point P is in both the VP and the HP. It lies in xy. (ii) Q is 40 mm infront of the VP and 25 mm … Read more

Draw the projections of the following points on a common reference line (i) P, 35 mm behind the VP and 20 mm below the HP. 3 (ii) Q, 40 mm in front of the VP and 30 mm above the HP. (iii) R, 50 mm behind the VP and 15 mm above the HP. (iv) S, 40 mm below the HP and in the VP. (v) T, 30 mm in front of the VP and 50 mm below the HP. (vi) U, 35 mm behind the VP and in the HP.

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Q.Draw the projections of the following points on a common reference line (i) P, 35 mm behind the VP and 20 mm below the HP. 3 (ii) Q, 40 mm in front of the VP and 30 mm above the HP. (iii) R, 50 mm behind the VP and 15 mm above the HP. (iv) … Read more

ENGINEERING DRAWING —- PROJECTION OF POINTS

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PROJECTION OF POINTS  Let us consider a horizontal plane and vertical plane situated as shown in Fig. 6.0. They are forming four quadrants namely: (1) First quadrant (ii) Second quadrant (iii) Third quadrant and (iv) Fourth quadrant. 1. First Quadrant: It is a space derived above the H.P and in front of V.P as shown … Read more

GEOMETRICAL CONSTRUCTIONS —– CYCLOIDAL CURVES — EPI-TROCHOID

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CYCLOIDAL CURVES — EPI-TROCHOID An epi – trochoid is a curve traced by a point situated either within (or) outside the generating circle, when it rolls without slipping on the circumference of another circle [directing circle] outside it. (a) If the tracing point lies out side the generating circle the curve traced is called a … Read more

GEOMETRICAL CONSTRUCTIONS — GENERAL CURVES – HELIX

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GENERAL CURVES – HELIX Helix is the locus of a point moving around and along the curved surface of a cylinder or cone with combined uniform angular velocity and uniform linear velocity about and in the direction of the axis. The linear distance moved by the point in one revolution is called pitch or lead. … Read more

GENERAL CURVES – CYCLOID —– ENGINEERING DRAWING

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GENERAL CURVES They are cycloid, involute Helix etc., CYCLOID A cycloid is a curve traced by a point on the circumference of a circle which rolls without slipping along a line. The circle which rolls along the line is called rolling circle, and the line on which the circle rolls is called director.  PRACTICAL APPLICATION … Read more

ENGINEERING DRAWING – CONSTRUCTION OF REGULAR POLYGON

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CONSTRUCTION OF REGULAR POLYGON The following procedures describe the methods of drawing regular polygons of any number of sides. METHOD 1: Q.construct a regular polygon of any number of sides (say pentagon) given the length of one of its sides as 25 mm. Solution: Procedure: AB is the given side. It is required to draw … Read more

TYPES OF LINES – ENGINEERING DRAWING

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TYPES OF LINES   DESCRIPTION OF LINE APPLICATION 1. Continous thick visible out lines and Edges. 2. continous thin ( stright or  curve ) Imaginary lines, Dimension lines, Projection lines, Leader lines, Hatching, short centre lines. 3.continous thin (Free hand ) Limits of Partial or interrupted views and sections 4. Continous thin zigzag Long break lines … Read more

DRAWING INSTRUMENTS – ENGINEERING DRAWING

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DRAWING INSTRUMENTS The drawing instruments which are used to perform drawing work. The different types of drawing instruments mention below. DRAWING BOARD Along the left edge of the board, a groove is cut and a perfectly straight ebony edge called working edge, is inserted into the groove. The drawing board should be placed on the … Read more