LOADS & SPEEDS
 

User Guide

In order to utilise this information the following should be considered by any user.

The dynamic load charts display a number of coloured lines which relate to the shaft surface speed in metres per minute. The following calculation shows an example of calculating this figure when the shaft RPM and diameter are available.

Example 1. To calculate the dynamic load when shaft RPM and diameter are known.

Shaft RPM: 30

Shaft diameter: 30mm

Initially the shaft diameter requires converting to metres.

30mm/1000 = 0.03 metres

The shaft circumference should now be calculated as below.

0.03 metres x 3.142 = 0.094 metres

Therefore the shaft surface speed is calculated as below.

0.094 metres x RPM = metres per minute

0.094 x 30 = 2.82 metres per minute.

Example 2.

What is the maximum RPM for a 200mm diameter shaft supporting 80 tonnes load on a DIN506 unit?

RPM = Surface Speed (Metres/ minute)

3.142 x Shaft Diameter (metres)

By reviewing the dynamic load rating graph on page 7 it can be established that the dark blue line intersects at 80 tonnes load and 200mm shaft dia. Resulting in a shaft speed of less than 8 metres per minute. This is the only speed at which the unit will operate at such a load. (i.e at between 9m/min and 15 m/min the maximum load would be 40 tonnes). The shaft speed can now be calculated in RPM as below.

RPM = 8 m/min .

3.142 x 0.2m

RPM = 8/ 0.6284