Quote:
Originally Posted by InFlight
The maximum torque capability for a 0.5" hex shaft is = 0.0262 * Yield Strength.
A 6061-T6 shaft can theoretically take 1048 in*lbs (or 87 ft*lbs)
7075-T6 shaft is likewise is 1912 in*lbs (or 159 ft*lbs)
You would be far more likely to break some FRC gearbox teeth before you ever failed these shafts in torsion.
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See day 36 of JVN's 2010 build journal for an example of a well supported aluminum shaft that failed due to pure torsional load.
The 1912 in lbs you quote is only valid if this torque is gradually applied. The shaft can fail earlier than that with a quickly changing load.