Question 1
(1) Two unequal pipes diameter 45 and 60 respectively intersect at 30o as shown above.
Draw, full size, the following:
(a) complete front elevation;
(b) plan;
(c) development of part q with XX as the seam.
Observation
Candidates were expected to do the following:
A. DRAW THE COMPLETE ELEVATION:
(i) draw two centre lines;
(ii) draw vertical pipe;
(iii) draw slanting pipe q at 300 to the horizontal;
(iv) draw the semi-circle/circle on pipe and divide into 6/12 equal parts;
(v) project lines from the points on the semi-circle/circle parallel to the sides of pipe q.
B. PROJECT THE PLAN:
(i) draw two centre lines;
(ii) draw a circle for the vertical pipe;
(iii) draw the sides of the pipe q on plan;
(iv) draw semi-circle/circle on pipe and divide into 6/12 equal parts;
(v) draw horizontal lines from the points on the circle of pipe q to the circle for the vertical pipe;
(vi) project lines from the end of pipe q in elevation to intercept the horizontal lines on pipe q on plan;
(vii) draw the end of pipe q on plan.
C. CURVE OF INTERSECTION:
(i) project up from the intersecting lines from the circle to the vertical pipe in elevation;
(ii) plot the corresponding points in the elevation;
(iii) join the points for the curve of intersection.
D. DEVELOP PIPE Q WITH X – X AS THE SEAM:
(i) lay out the circumference of pipe q and divide into 12 equal parts;
(ii) draw vertical lines on the division points;
(iii) transfer ordinates from pipe q in the elevation to the development;
(iv) join the points with a curve;
(v) use X – X as the seam.
E. (i) use the correct scale 1:1;
(ii) draw neatly.
The solution is shown below: