PROJECTIONS OF LINES It is the shortest joining of two end points. In this article, the projections of lines with reference to the different planes are explained. They are when (A) the line is parallel to one or both the planes. (B) the line contained by one or both the planes. (C). The line perpendicular … Read more
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
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
PROJECTION OF POINTSÂ 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
CYCLOIDAL CURVES — HYPO -TROCHOID HYPO-TROCHOID A hypo-trochoid is a curve traced by a point situated either within (or) outside the generating circle, when it rolls without slipping on circumference of another circle [directing circle], inside it. (a) If the tracing point lies outside the generating circle, the curve traced is called a superior hypo … Read more
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
CYCLOIDAL CURVES — INTERIOR – TROCHOID In this case, some curves related to cycloid are also drawn for further know-how of th reader. INTERIOR – TROCHOID If the rectangular lies within the generating circle, the curve traced is called an interior trochoid. Q.A circular disc of 40 diameter rolls along a st. line for one … Read more
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 – INVOLUTE INVOLUTE When a flexible thread is unwound from a circle or square etc., (the thread being kept stretched), the curve traced out by the end of the thread is called an “Involute”. PRACTICAL APPLICATION The profile of a gear teeth is an involute of a circle. Although theoretically, an involute profile … Read more
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. Â PRACTICAL APPLICATION … Read more