A continuous miner has the following specifications
Cutter Drum width 3.2m
Drum diameter across the picks 0.9m
Available drum torque (cutting) 160m
maximum sump force 57rpm
number of picks cutting drum 84
It is to be used to cut coal which has the following cutting properties
Specific cutting force per pick (new) 37.5N/mm
Specific normal force per pick (new) 20.0N/mm
Estimate the performance of the continuous miner
1 When equipped with all new picks
2with picks with an average condition of wear