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Engineering rule
(lemmy.world)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
Not civil but mechanical engineer here. There are some rule of thumb formulas involved during the construction of a gearbox, e.g. the diameter in
mm
of a shaft at the bearings: cubic root of the torque inNm
. The 'necessary volume' of a gear wheel is another formula involving adventurous math.