
torque measurement  
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Posted by: robertedelong ^{®} 04/21/2006, 20:17:21 Author Profile eMail author Edit 
Lets says we have a 5/8" shaft that has a constant 80 ft lbs of torque applied that causes it to rotate (rpm is not available); how do we arrive at a NM measurement? 
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Re: torque measurement  
Re: torque measurement  robertedelong  Post Reply  Top of thread  Forum 
Posted by: zekeman ^{®} 04/22/2006, 09:16:38 Author Profile eMail author Edit 
What has NM got to do with angular motion?
NM is a measure of torque and is easily convertable to ftlb which are both units of torque. If you are asking what happens to a pure shaft under torque it is simply T=Ia where T= torque I =moment of tinertia of shaft a = angular acceleration w=at where w= angular velocity t= time torque is applied 
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Re: torque measurement  
Re: Re: torque measurement  zekeman  Post Reply  Top of thread  Forum 
Posted by: robertedelong ^{®} 04/22/2006, 10:29:54 Author Profile eMail author Edit 
OK; Maybe I should re phrase this issue; you're already way over my head. when generator specs are stated, the torque is usually shown in Newton meters; that is: the turning force needed to produce X amount of KW. now let's look at maximum torque at maximum load (not starting torque); Now let's rotate a 5/8" shaft by a verticle upward thrust of 80 pounds constant; the shaft rpm is unknown; what is the newton meter torque of the shaft? 
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Re: Re: torque measurement  robertedelong  Post Reply  Top of thread  Forum 
Posted by: Kelly_Bramble ^{®} 04/24/2006, 10:00:48 Author Profile eMail author Edit 
FYI, Engineers Edge has misc. on electic motors/fans:
/motors/motors_definitions.htm /motors/sizing_electric_motor.htm /motors/sizing_electric_motor.htm /motors/motor_menu.shtml (bunch of stuff here) 
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Re: Re: torque measurement  robertedelong  Post Reply  Top of thread  Forum 
Posted by: zekeman ^{®} 04/24/2006, 09:51:09 Author Profile eMail author Edit 
If the thrust on the shaft is inline with the shaft, the torque is zero. However, if you mean the thrust force is delivered to the edge of the shaft, like when there is a string over the shaft, then the torque is simply
T=F*r where r is the shaft radius and F is the force on the string. 
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