mech 153 - assignment 1

Preliminary

Review the section in the textbook on V-Belts.

Take a look at these YouTube videos to get a feel for V-Belts:

• BMW belt adjustment
• Inspect and Replace your cars V-Belts

Question 1

A 1.1 kW, 1750 rpm motor is to operate a band saw whose flywheel turns at approximately 800 rpm.  A pulley attached to the flywheel shaft connects, by means of a V-belt, to the pulley on the motor shaft.  The Centre-to-centre (c/c) distance between the two shafts is 340 mm.  Calculate the size of the V-Belt required.

Question 2

A 0.5 hp, 1160 rpm motor is used to operate a drill press.  The spindle is to operate at two different speeds: 520 rpm and 65 rpm.  The centre-to-centre (c/c) distance between the motor and spindle shives is approximatelly 22 inches when the spindle is operating at the higher speed.  Select a suitable V-belt and approximatelly predict how much the motor will have to move to maintain belt tension when the spindle speed is changed.