Task 1: Pulley Size The machine has a motor which runs at a speed of 1725 rpm and has a gear reducer ratio of 1505:1. This gear reducer ratio means that for every 1,505 revolutions on the input side, there is only 1 revolution on the output side. This not only slows the rotation, but it increases the torque to rotate the huge auger by using a small motor inside the tank. There are several pieces of this machine that utilize Diameters:

Driven Sprocket Diameter, which is unknown

Drive Sprocket Diameter 6.8 inches

Drive Pulley Diameter 3.4 inches

Driven Pulley Diameter 4.2 inches

Your goal is to reduce the shaft rotation to a speed of 0.333 rpm and to determine the Pulley Diameters needed to achieve this. Many of these pieces of information are standard in the industry. For example, a motor with a speed of 1,725 is standard for this machine as is the gear reducer ratios and pitch diameters. The ratios are set up in the form of driven/drive = ratio.

1. How many RPMs does the Driven Pulley rotate?

2. What is the RPM of the Drive Sprocket?

3. What Driven Sprocket diameter would produce 0.333rpm of the main shaft?