Fig.3.30 depicts the structure of Whitworth quick return mechanism used in reciprocating machine tools. The various dimensions of the mechanism for a specified stroke of the tool are:

\[ O Q=120 \mathrm{~mm}, O P=240 \mathrm{~mm}, R Q=180 \mathrm{~mm} \text {, and } R S=600 \mathrm{~mm} \text {. } \]
Crank \(O P\) makes an angle of \(60^{\circ}\) with the vertical. Determine the velocity of the slider \(S\) (cutting tool) when crank rotates at \(120 \mathrm{rpm}\) clockwise. Find also the angular velocity of the link \(R S\) and the velocity of the sliding block on the slotted lever \(Q T\).

Transcribed Image Text:

R 180 600 120 240 00 Scale: 1 cm = 60 mm (a) Configuration diagram cr fp.p pp ipp S Vp2 P2 Vp1p2 p Scale: 1 cm = 1000 mm/s (b) Velocity diagram P fsq S fpo 0,9 Scale: 1 cm 5000 mm/s (c) Acceleration diagram