The image above represents the mill speed.
To compute for mill speed, two essential parameters are needed and these parameters are Speed Percentage (N%) and Critical Speed (Nc).
The formula for calculating mill speed:
MS = N% x Nc
Where:
MS = Mill Speed
N% = Speed Percentage
Nc = Critical Speed
Let’s solve an example;
Find the mill speed when the speed percentage is 12 and the critical speed is 10.
This implies that;
N% = Speed Percentage = 12
Nc = Critical Speed = 10
MS = N% x Nc
MS = (12/100) x (10)
MS = (0.12) x (10)
MS = 1.2
Therefore, the mill speed is 1.2 m/s.
Calculating the Speed Percentage when the Mill Speed and the Critical Speed is Given.
N% = MS / Nc
Where;
N% = Speed Percentage
MS = Mill Speed
Nc = Critical Speed
Let’s solve an example;
Find the speed percentage when the mill speed is 24 and the critical speed is 6.
This implies that;
MS = Mill Speed = 24
Nc = Critical Speed = 6
N% = MS / Nc
N% = 24 / 6
N% = 3
Therefore. the speed percentage is 3 m/s.