Question

A line CD 60mm long had its end C in both H.P and V.P. It is inclined at 300 to H.P and 450 to V.P. Draw the projections
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Answer 1

Notation

(TL) = a’b’1 (in FV) = ab2 (in TV)

A is above HP = a’ (↑)

A is below HP = a’ (↓)

A is in front of VP = a (→)

A is in behind VP = a (←)

Front View (FV) = a’b’

Top View (TV) = ab

Elevation Length (EL) = a’b2’

Plan Length (PL) = ab1

True inclination of line with HP = θ

True inclination of line with VP = Φ

Inclination of FV with XY line = α

Inclination of TV with XY line = β

Q. 1

Ans –

Given Data:-

True Length (TL) = a’b1’ = ab2 = 60 mm

A is 10 mm above HP = a’ (↑) = 10 mm

A is 15 mm in front of VP = a (→) = 15 mm

θ = 25°

Φ = 40°

• Follow the procedure given below step by step to draw the projection of line –

• Draw XY line.

• Mark a’ and a at 10 mm above XY line and 15 mm below XY line respectively.

• Draw horizontal line from a’ and a.

• Draw a line of true length (TL) = 60 mm from point a’ at an angle of 25° (a’b1’).

• Draw a line of true length (TL) = 60 mm from point a’ at an angle of 40° (ab2).

• Take the projection of b1’ into TV (Draw a vertical line from point b1’) which will cut the horizontal line passing through point a . Mark that point b1, ab1 is your plan length (PL).

• Take the projection of b2 into FV (Draw a vertical line from point b2) which will cut the horizontal line passing through point a’ . Mark that point b2’, a’b2’ is your elevation length (EL).

• Draw a horizontal line from point b1’, that is your locus of b’.

• Draw a horizontal line from point b2, that is your locus of b.

• Taking a’ as center and a’b2’ as radius draw an arc which will cut the locus of b’, mark that point b’. Join a’b’, that is your FV.

• Taking a as centre and ab1 as radiusdraw an arc which will cut the locus of b, mark that point b. Join ab, that is your TV.enter image description here