This device consists of driving and driven pulleys of equal diameter, powered by a variable speed DC motor. The pulleys are mounted on the input (motor) shaft and the output shaft. To adjust the initial tension of the belt, the driven pulley can slide along the base with the bearing block. Power output is measured through the brake drum located on the output shaft. The motor speed is adjustable using dimmer stats. A two channel RPM indicator is provided to measure the speeds of both the driven and driving pulleys.

Experimental Objective

• To measure co efficient of friction between pulley material and different belt materials.
• To measure power transmitted with varied belt tensions and plotting graph of (T1 -T2). Tension Characteristics.
• To measure percentage slip at fixed belt tension by varying load on brake drum and plot graph of (T1-T2) Vs. percentage slip i.e. Slip Characteristics. Finding a creep zone from graph
• To measure belt slip speed and observe the limiting value float at constant speed when the slip just starts.

Specifications

• DC Motor 1 HP, 1500 RPM, variable speed.
• Driving and driven pulleys of equal diameters.
• Brake drum with spring balance.
• Fiat belt of fixed length Fabric belt, Canvas belt, Rubber belt.
• Belt tightening arrangement included.
• Speed controller unit provided.
• Two channel digital RPM indicator.
• Stroboscope included.

Utilities required other than above supply

• Stabilized power supply 230 Volts AC.
• Space required 1.5m x 1.5m.