Let's sacrifice one Lego axle to see how it deforms or breaks when high torque is applied. The results (using PF M-motor): 1:1 (40 mNm) - ok 3:1 (110 mNm) - ok 5:1 (180 mNm) - slight permanent deformation 9:1 (300 mNm) - serious permanent deformation 15:1 (500 mNm) - even more serious permanent deformation - (? mNm) - breaks in half
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