A line AB is in the first quadrant. Its ends A and B are 20 mm and 60 mm in front of to VP respectively. The distance between the end projectors is 75 mm. The line is inclined at 30° to the HP and its HT is 10 mm above XY line. Draw the projections of AB and determine its true length and mark VT
Answers
TL = 77 mm
Explanation:
To construct a line projection, follow the process outlined below step by step.
Make an XY line.
Mark a' and an at 25 and 45 mm above and below the XY line, respectively.
Make a horizontal line between a' and a.
Mark b' and b at 60 and 15 mm above and below the XY line, respectively.
Draw a horizontal line between b' and b and label it locus of b' and locus of b.
From point a', mark a point at DBEP = 60 mm and draw a vertical line from that point.
The locus of b' and locus of b at will be cut by this vertical line. Make a note of the points b' and b, respectively.
Join a'b' (FV) and ab together (TV).
Make an arc with a' as the centre and a'b' as the radius that will cut the horizontal line that passes through a', and label it b2'.
Join the a'b2' community (EL).
Draw an arc with an as the centre and ab as the radius that will cut the line that passes through a, and mark it b1.
Take part in ab1 (PL).
By projecting b1 into FV, draw a vertical line from point b1 to cut the locus of b' (Draw a vertical line from point b1). Make a mental note of the letter b1'.
Join the a'b1' group (TL).
To cut the locus of b, draw a vertical line from point b2'. Take b2' and project it onto the television (draw a vertical line from point to point).
Answer:
A line AB is in the first quadrant. Its ends A and B are 20 mm and 60 mm in front of to VP respectively. The distance between the end projectors is 75 mm. The line is inclined at 30° to the HP and its HT is 10 mm above XY line. Draw the projections of AB and determine its true length and mark VT