Question 2
Figure 2 shows a link mechanism. The crank OM rotates about O and N is constrained to move to and fro horizontally. Plot the locus of point L for one complete revolution.
Observation
The question requires candidate to:
- copy the given layout;
- divide the circle into 8/12 equal parts;
- locate the different positions of L;
- join the points into a smooth curve.
The question was well attempted and candidates performed well.
Candidates were expected to:
(a)draw the given mechanism (crank OM, link NL,
circle R25 at point O and horizontal line through N);
(b)indicate directions of movement of crank OM and link NL;
(c)divide circle R25 into 8/12 equal parts;
(d)locate different positions of crank OM;
(e)mark out different positions of point L;
(f)join the points L, into a smooth curve;
(g)draw neatly.
The solution is shown below:
