BME 1202 Assignment 27 Engineering drawing PDF

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Summary

Construct a forward reading Vernier scale to read distance correct to
decametre on a map in which the actual distances are reduced in the
ratio of 1: 40,000. The scale should be long enough to measure up to
6 km. Mark on the scale a length of 3.34 km and 0.59 km....

Description

BME 1202 Assignment 27.04.2020 Attempt all Question. The work is due when you return to campus. Also, for practice and guidance, follow the procedure in the appendix. 1. Construct a forward reading Vernier scale to read distance correct to decametre on a map in which the actual distances are reduced in the ratio of 1: 40,000. The scale should be long enough to measure up to 6 km. Mark on the scale a length of 3.34 km and 0.59 km. 2. A line AB, 90mm long, is inclined at 30 to the HP. Its end A is 12mm above the HP and 20mm in front of the VP. Its FV measures 65mm. Draw the TV of AB and determine its inclination with the VP. 3. A Circular plane with a 60mm Diameter is resting on a point it’s circumference on the VP. The centre is 40 mm above the HP, and the surface is inclined at 450 to the VP and perpendicular to the HP Draw its projections. 4. Construct the isometric view of the figures below. On the same page, construct the first angle projection with a scale of 1:1. a) b)

5. Construct an ellipse when a pair of conjugate diameters AB and CD are equal to 120 mm and 50 mm respectively. The angle between the conjugate diameters is 60°. (Hint: Use the parallelogram method)

Appendix

Draw the isometric view of a Circle lamina with a 60mm Diameter on all three Principle Planes using for centre methods? Solution – Construction 1. Draw a Rhombus ABCD of 60mm side to represent isometric view of a square 2. Mark 1,2,3 and 4 as midpoints of the sides AB, BC, CD and DA respectively join (the ends of the minor diagonals) B to meet points 3 & 4 and D to meet points 1 & 2. Let B4 and D1 intersect at point E and B3 and D2 intersect at a point F. then B, E, D and F are the Four centres for drawing the ellipse 3. With centre B and radius B3 draw Arc 3-4. With centre D and Radius D1 draw Arc 1-2. With centre E and radius E1 draw Arc 1-4. With centre F and radius F2 draw Arc 2-3. 4. These Arcs join in the form of an Ellipse which represents the required isometric as shown in figure (a) – Front view, (b) – Top view, and (c) – Side view

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