Q.A circular plate of 40 mm and negligible thickness rests of H.P. makes an angle 45º to it and one of its diameter is inclined to V.P. at 30. Draw the projection keeping distance of the centre of the plate is 40 mm in front of the V.P.
Q.A circular plate of 40 mm and negligible thickness rests of H.P. makes an angle 45º to it and one of its diameter is inclined to V.P. at 30. Draw the projection keeping distance of the centre of the plate is 40 mm in front of the V.P.
SOLUTION:
Construction: Steps to be followed
1. Draw the xy line.
2. Draw the top view 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 of the 40 mm diameter circular plate such that the centre of the plate is 40 mm away from xy plane.
3. Then 1′,2′ 12′,3′ 11′,4′ 10′,5′ 9′, 6’8′,7′ on the xy line is the corresponding front view of the circular lamina for the first stage.
4. Redraw the front view such that 7′ is on the xy line at 7, and make an angle of 45° with the xy line. This gives the front view for second stage.
5. Taking vertical projectors through 14, 21, 121, 34 11.4 10.5 9. 6, 8, 7, and horizontal projectors through 17; 26; 35, 4; 8 12; 9 11 and 10 then draw the second stage top view 12345678 9 10 11 12 by joining systematically, their corresponding points of intersection.
6. Redraw the second stage top view 11 21 3 1 4 1 5 1 61 7 1 8 1 9 1 10 1 11 1 12 1 and 12 Z_{2} 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 2 12 2 such that one of its diameters ( 4 2 10 2 ) makes an ange of 30° with xy line. This gives the third stage top view.
7. Then taking vertical projectors through the third stage plane l_{2} Z_{2} 32 4 2 52 6 2 7 2 8 2 9 2 10 2 11 2 12 2 and horizontal projectors through the second stage front view 1 1′ Z_{1}’ 3 1′ A_{1}’ 10 1′ 9,681,71 9 1′ 8 1′ 7 1′ and plot their corresponding intersection points. These points when joined in a systematic order gives the final front view 1 2′ 12,22.32.42.52.62,72,82,92,102,112,122 Z_{2}’ 3 2′ \mathcal{S_{2}}’ \mathcal{P}_{2}’ 10 2 of the circular lamina.
