History: Gripper Shoe
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r193961 · current
- Created Gripper Shoe (part): "A large curved steel pad on each side of the machine, pressed against the tunnel wall with a force many times the thrust, so the machine can push and turn the cutterhead without slipping. It is sized to keep the pressure on the rock low, around 3 MPa on some designs, and slotted so it can pass over installed rock bolts."