@@TheThirdModel y probaste cambiar el diseño de la cabeza de corte para que tenga un punto de ataque mas certero y reducir la fricción de los engranajes
I might not have done tunnel boring, but in pipeline boring, a small bit is sent to start the guide hole, and it it reamed back and forth until the hole is wide enough for the pipe.
Very interesting, thanks for the information. As far as I know, large TBMs don't do a guide hole. However, a pipeline boring machine could be a nice model in its own right.
i am late to the party, but last month or so a another YT channel build a LTM and dug through sand whilst laying tunnel wall so it could rest on it. Its head was really good at slicing through that sand
But of an old one but might try adding cutting wheels? i know the small umbrella like pieces with the crossaxle support could function. they'd greatly reduce friction and probably yield similar results.
I was thinking of trying casting sand. My only concern is how much the sand will damage the plastic gears and other moving components. And cleaning it afterwards...
Is there a failure in the instruction, step 281? If I assemble the parts like there, the black gear turns in the opposite direction the grey ones above do. It can't work, so I removed the black gear and the boring head turns.
Apologies for not seeing your comment earlier! From what I can see, Step 281 is correct. Perhaps check that all of the 12 tooth bevel gears (LEGO part number 6589) are in the correct position in the drivetrain: Steps 109, 156, and 160. I hope that helps!
