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shaft materials question

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Posted By<" ">Bob on May 30, 2002 at 21:56:19:

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,

Follow Ups

Re: shaft materials question Randy Kimball 23:18:51 7/26/2002 (0)
Re: shaft materials question Bill Beam 11:05:24 6/03/2002 (0)
Re: shaft materials question Crayon 07:56:26 5/31/2002 (0)

Subject: Re: shaft materials question

Comments:: 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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