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Re: shaft materials question

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Posted ByCrayon on May 31, 2002 at 07:56:26:

In Reply to: shaft materials question posted byBob on May 30, 2002 at 21:56:19:

4130 is pretty tuff material. You might consider 4130 or 4340 "Stress Proof" or "Stress Relieved".

Good Luck!

: I need help in specifying the motor shaft material and heat treatment for my Battlebot (well that's my hobby). I already did have a shaft made out of unhardened 4140 steel and the electric motor twisted the shaft until it sheared.

: The electric DC motor (it's a DeWalt hammerdrill motor overvolted by 50%) is generating 68 ft-lbs of torque at stall and the electronics are built so that its ok to stall the motor. The shaft is 0.393" diameter and has 4 splines cut into the shaft, each cut is an arc of depth .070 and length of .182. So the x-sectional area of the shaft would have been .121 square inches without the splines and the x-sectional area with the splines is .083 square inches.

: Of course the shaft needs to be made of something conventional, our budget for the whole Battlebot is around $5K.

: If anyone has a suggestion for the shaft material and heat treatment, well that would be really helpfull,

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Subject: Re: Re: shaft materials question

Comments:: 4130 is pretty tuff material. You might consider 4130 or 4340 "Stress Proof" or "Stress Relieved". : Good Luck! : : I need help in specifying the motor shaft material and heat treatment for my Battlebot (well that's my hobby). I already did have a shaft made out of unhardened 4140 steel and the electric motor twisted the shaft until it sheared. : : The electric DC motor (it's a DeWalt hammerdrill motor overvolted by 50%) is generating 68 ft-lbs of torque at stall and the electronics are built so that its ok to stall the motor. The shaft is 0.393" diameter and has 4 splines cut into the shaft, each cut is an arc of depth .070 and length of .182. So the x-sectional area of the shaft would have been .121 square inches without the splines and the x-sectional area with the splines is .083 square inches. : : Of course the shaft needs to be made of something conventional, our budget for the whole Battlebot is around $5K. : : If anyone has a suggestion for the shaft material and heat treatment, well that would be really helpfull,

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