Why the cutting wheels on the face of a tunnel boring machine are irregularly placed rather than set in symmetrical spirals?

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Why the cutting wheels on the face of a tunnel boring machine are irregularly placed rather than set in symmetrical spirals?

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Anonymous 0 Comments

Symmetry can lead to vibrations which self-reinforce each other and become amplified to destruction. Think marching troops on a bridge making it shake and fall. An irregular pattern disrupts this.

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