The crankshaft of a small punch press rotates 100 rpm, with the shaft torque fluctuating between 0 and 1000 N#m in accordance with curve A of Figure P1.67. Thepress is driven (through a gear reducer) by a 1200-rpm motor. Neglecting frictionlosses, what motor power would theoretically be required:

(a) With a flywheel adequate to minimize speed fluctuations.

(b) With no flywheel.

Crankshaft torque Tmax 0 FIGURE P1.67 Curve B (half-wave rectified sinusoid) Curve A (linear variation) 0.5 1.0. Crankshaft rotation, revolutions 1.5. 2.0