Torque calculation to a drive a roller

[saru.madu@gmail.com]

Dimensions
We’ve a roller of length 400mm & Dia of 90mm. At both ends of the roller a shaft is fitted. Shaft dia is 25 mm & length is 100mm each side. On the 25mm Dia shaft, two flanged bearings are fitted. The total roller & shaft weight is 6 kgs.

Working Principle:

Over the roller, a fabric in a roll form is loaded. The fabric roll sits over this roller by means of gravity. The roller has to drive the fabric roll on its circumference & feed the fabric end to another machine.

Problem:

1. What is the torque required to drive the roller at the shaft end.

2. What HP of motor, we should select to drive the shaft, if the motor is directly connected (without any gear box) to the 25mm dia shaft

[Kelly_Bramble]

Check out the following document:

sizing_gearmotors_for_conveyor_apps (1).pdf