The operating mode of the mining machine is selected on the basis of maximum productivity at an acceptable level of dynamic load. Achieving the maximum permissible feed rate determines the optimum between the average and instantaneous loads, hence the permissible level of dynamics.
The main types of machines used for tunneling works in the construction of the Leningrad Metro, destroying rock by cutting: tunneling machine KT1-5,6 with a rotary actuator, machine AMSH with a screw actuator and tunneling boom with a crown actuator (types GPC, PK-ER, 4PU).
