Design and Engineering Forum

Engineering & Drafting Store | Engineering Data | Product Services Directory
Engineering Forum | Engineering Jobs
Engineering News | GD&T Training ASME Y14.5M 1994 | Calculators

POSTING POLICY / RULES

Forum Moderators: randykimball, Administrator

torque measurement
Post Reply   Forum
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?







Post Reply | Recommend Email | Alert Administrator View All   | Next |

Replies to this message


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 ft-lb 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







Post Reply | Recommend Email | Alert Administrator Where am I? Original Top of thread | |
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?








Post Reply | Recommend Email | Alert Administrator Where am I? Original Top of thread | |
Re: Re: torque measurement
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)








Post Reply | Recommend Email | Alert Administrator Where am I? Original Top of thread
Re: Re: torque measurement
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.







Post Reply | Recommend Email | Alert Administrator Where am I? Original Top of thread | |

Powered by Engineers Edge

© Copyright 2000 - 2019, by Engineers Edge, LLC All rights reserved.  Disclaimer