Projection of planes 038

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Projection of planes 038

  1. 1. Problem 12.8 : Draw the projections of a circle of 50 mm diameter resting on the HP on point Aon the circumference. Its plane inclined at 45º to the HP and (a) The top view of the diameter ABmaking 30º angle with the VP (b) The diameter AB making 30º angle with the VPThe 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 drawndirectly as shown in 3rd step.While in 12.8(b) angle of AB itself i.e. it’s TL, is given. Hence here angle ofTL(ab2) is taken, locus of b2 is drawn and then LTV I.e. a1 b1 is marked andfinal TV was completed.Study illustration carefully. 7’ 6’ b’ b1’71’ 72’ 5’ 8’ 81’ 82’ 62’ 6 1’ 9’ 91’ 9 2’ 4’ 51’ 5 2’ 10’ 101’ 102’ 3’ 42’ 41’ 2’ 11’ 111’ 112’ 12’ 31’ 3 2’ 1’ 121’X 45º 21’ 122’ 2 2’ 1’ 2’ 3’ 6’ 7’ a’ a1’11’ 1 2’ Y 4’ 5’ a’ 12’ 11’ 10’ 9’ 8’ b’ 4 4 3 3 5 3 5 4 1 2 1 1 2 3 1 1 4 2 6 2 6 1 5 11 a1 1 1 a111 1 Ø β 1 1 1 30º 5 6 121 1a 7b 11 a1 b171 121 1 1 6 b171 12 8 121 8 111 1 b2 111 1 8 b1 7 11 9 111 9 101 9 101 1 101 1 9 8 10 1 1 1

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