The driving crank \(O_{1} A\) of the quick-return motion mechanism shown in Fig. 3.38 resolves at a uniform speed of \(200 \mathrm{rpm}\) clockwise. Find the velocity and acceleration of tool post \(C\) when the crank makes an angle of \(60^{\circ}\) with the vertical line of centres \(O_{1} O_{2}\). What is the acceleration of sliding of block \(A\) along the slotted lever \(O_{2} B\) ?

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17. C 150 60 200 B A' on OB 02 Fig.3.38 Quick-return motion mechanism