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Re: Re: Re: Gearbox Design

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Posted By<" ">Serdar Yorulmaz on October 07, 2002 at 11:46:54:

In Reply to: Re: Re: Gearbox Design posted byMark Donnelly on October 06, 2002 at 21:27:22:

Mark,
Nominal torque in output shaft looks just fine. but the maximum output torque is an incredible torque. you say it is 716197Nm this is a torque that an incredible machine can produce. I do not think you are correct on output shaft's torque. If I were you I would check the output torque one more time. the other thing is your speed reducer is a 2 stage speed reducer. not a 3 stage speed reducer. you know that there are three strength formulations in order to define the diameter or shaft. I do define the diameter usually depending on the maximum deflection with considering the safety twist angle. because there is a huge load on your shaft. the other thing is your load type. what kind of load do you have a shock load, moderate shock or heavy shock. these things are important to but you had to do that at the beginning when you define the dimaters of your gears. DO not forget. diameters of your gears will affect the force acting on your shafts. Please double check your gear coefficients one more time. you could save material which means money. and cheaper design. The other thing which I do suggest you is double check your bearing efficiency coefficients. The coefficiency should to be between 0.99 and 0.97. These numbers will affect the torque in shafts. One more hint. If possible use two or three different module formulations too and analyze the difference between the results. THAT WILL AFFECT THE DIAMETERS OF YOUR GEARS and force acting on the shafts. after checking all these things one more time. the rest is easy shaft design ACCRODING to the twist, deflection and vibration. you will be required to check all those three things. let me know after all these things which will save material on shafts.
Serdar.

Follow Ups

Re: Re: Re: Re: Gearbox Design eng/ Emad Hassanien Aly 06:59:10 01/19/03
Re: Re: Re: Re: Gearbox Design Mark Donnelly 00:47:45 10/08/2002 (0)

Subject: Re: Re: Re: Re: Gearbox Design

Comments:: Mark, : Nominal torque in output shaft looks just fine. but the maximum output torque is an incredible torque. you say it is 716197Nm this is a torque that an incredible machine can produce. I do not think you are correct on output shaft's torque. If I were you I would check the output torque one more time. the other thing is your speed reducer is a 2 stage speed reducer. not a 3 stage speed reducer. you know that there are three strength formulations in order to define the diameter or shaft. I do define the diameter usually depending on the maximum deflection with considering the safety twist angle. because there is a huge load on your shaft. the other thing is your load type. what kind of load do you have a shock load, moderate shock or heavy shock. these things are important to but you had to do that at the beginning when you define the dimaters of your gears. DO not forget. diameters of your gears will affect the force acting on your shafts. Please double check your gear coefficients one more time. you could save material which means money. and cheaper design. The other thing which I do suggest you is double check your bearing efficiency coefficients. The coefficiency should to be between 0.99 and 0.97. These numbers will affect the torque in shafts. One more hint. If possible use two or three different module formulations too and analyze the difference between the results. THAT WILL AFFECT THE DIAMETERS OF YOUR GEARS and force acting on the shafts. after checking all these things one more time. the rest is easy shaft design ACCRODING to the twist, deflection and vibration. you will be required to check all those three things. let me know after all these things which will save material on shafts. : Serdar.

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