Problem The dimensions of the various links of a pneumatic riveter, as shown Fig. are as follows: . OA=175 mm; AB = 180 mm; AD = 500 mm; BC= 325 mm. Find the velocity ratio between C and D. What will be the efficiency of the machine if a force of 2.5 kN on the piston C causes a thrust of 4 kN at the ram D? Solution. Given: Fc = 2.5 kN = 2500 N ; = FD=4 kN 4000 N Let N=Speed of crank OA. Angular velocity of crank OA, WAO 2π N/60 rad/s C A 45° 200 mm B in 2□N VAOVA x 0.175 0.0183 N m/s 60 (Perpendicular to OA)