ThunderHex inspired question

[Aren_Hill]

Originally Posted by FrankJ

I thought aluminum doesn't really have a fatigue limit. You load it in a reversing stress, it will eventually fail. (Granted maybe long past an FRC bots life time.) One reason air frames have a service life with inspections.

Maybe some one from VEX could comment, but didn't they switch a few years ago from 6061 to 7075 shafting because of fatigue issues?

VEXpro Hex shafting has always been 7075-T6 Aluminum. The 1/2" tube axle on the other hand (217-2762) is 6061-T6 due to lower loads (double supported with a bolt through it) and never being used to transfer torque.

-Aren