PROJECTION OF PLANES_038

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Problem 12.8 : Draw the projections of a circle of 50 mm diameter resting on the HP on point A on the circumference. Its plane inclined at 45 º to the HP and (a) The top view of the diameter AB making 30º angle with the VP (b) The diameter AB making 30º angle with the VP 1 a 2 3 4 5 6 7 b 8 9 10 11 12 1’ a’ 2’ 12’ 3’ 11’ 4’ 10’ 5’ 9’ 6’ 8’ 7’ b’ 1’ a’ 2’ 12’ 3’ 11’ 4’ 10’ 5’ 9’ 6’ 8’ 7’ b’ X Y 45 º 1 1 a 1 2 1 12 1 3 1 11 1 4 1 10 1 5 1 9 1 6 1 8 1 b 1 7 1 30 º a 1 1 1 2 1 12 1 3 1 11 1 4 1 10 1 5 1 9 1 6 1 8 1 b 1 7 1 a 1 ’ 1 1 ’ 2 1 ’ 3 1 ’ 4 1 ’ 5 1 ’ 6 1 ’ b1’ 7 1 ’ 8 1 ’ 9 1 ’ 10 1 ’ 11 1 ’ 12 1 ’ 1 1 2 1 12 1 3 1 11 1 4 1 10 1 5 1 9 1 6 1 8 1 7 1 2 2 ’ 3 2 ’ 4 2 ’ 5 2 ’ 6 2 ’ 7 2 ’ 8 2 ’ 9 2 ’ 10 2 ’ 11 2 ’ 12 2 ’ 1 2 ’ Ø β The difference in these two problems is in step 3 only. In problem no12.8(a) inclination of TV of that AB is given, It could be drawn directly as shown in 3 rd step. While in 12.8(b) angle of AB itself i.e. it’s TL, is given. Hence here angle of TL(ab 2 ) is taken, locus of b 2 is drawn and then LTV I.e. a 1 b 1 is marked and final TV was completed.Study illustration carefully. b 2 a 1 b 1 DESIGNED BY : AKASH SOOD M.I.T.M. (GWL.)

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