Question

For a coupler output motion generation problem, the grounded joints O2 and O4 are uniquely determined if there are ____ desired positions of the coupler link.

a) One

b) Two

c) Three

d) Four

Answer 1

1.Draw the output link in both extreme positions, say O4B1and O4B2such that the angle B1O4B2is the desired angle.

2.Join B1B2and extend it.

3.Select a point O2on the extended line B1B2.

4.Draw a circle of diameter B1B2about O2.

5.Let A1and A2be the intersection of the circle with extended line B1B2.

6.A1B1is the coupler and O2A1is the driving link.

7.Measure lengths of all links and check Grashof condition and redo from step 3 onwards if condition is not satisfied.

8.Check toggle points and transmission angles.