The crank \(A B\) of a four-bar mechanism shown in Fig.2.18

(a) rotates at \(60 \mathrm{rpm}\) clockwise. Determine the relative angular velocities of the coupler to the crank and the lever to the coupler. Find also the rubbing velocities at the surface of pins \(25 \mathrm{~mm}\) radius at the joints \(B\) and \(C\).

Transcribed Image Text:

B 3 40 cm 2 60 rpm 60 70 cm 100 cm Scale: 1 cm 10 cm (a) 0 60 cm T 20 cm a,d- Vod Vob Scale: 1 cm = 50 cm/s Fig.2.18 Four-bar mechanism (b) Velocity diagram