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I'm not up to speed on tunnel boring. Do they really grind away the whole cross-sectional area, instead of doing something like a hole-saw? Where you only mac
by floxy 2y ago
I'm not up to speed on tunnel boring. Do they really grind away the whole cross-sectional area, instead of doing something like a hole-saw? Where you only machine away some of the circumference?
https://en.wikipedia.org/wiki/Hole_saw https://en.wikipedia.org/wiki/Hole_saw
- immibis 2y agoNo matter what, the amount of material removed is the volume of the tunnel.
- dhosek 2y agoSo you cut a one meter-deep circle in a chunk of rock. How do you get that circle removed? The back is still attached to the rock behind it.
- floxy 2y agoBore deep enough that the weight of the cantilevered piece breaks off. Or use additional leverage to break that chunk off.
- thecopy 2y agoAnd then falls on the drill, making it stuck and bends the attachment. This is a solved problem: https://en.wikipedia.org/wiki/Tunnel_boring_machine https://en.wikipedia.org/wiki/Tunnel_boring_machine