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afrosales
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Join Date: Apr 2009
Location: Torrance, CA
Posts: 1

Force / Preload vs. Torque

04/10/2009 7:21 PM

If I am using a screw to push a load, how do I calculate the load I get from a given torque? I don't think it is the same formula I would use to calculate clamping force or preload in a screw, is it?
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nick name
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Join Date: Mar 2007
Location: City of Light
Posts: 3943
Good Answers: 183
#1

Re: Force / Pre-load vs. Torque

04/11/2009 4:10 AM

You can use same formula if you have the right ones considering the fact that the torque in an assembly depends on two friction zones:

-head or nut

- thread

In your case you have to keep the term for the thread friction and adapt the second to the way the contact on the contact surface is build up.
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Anonymous Poster
#2

Re: Force / Preload vs. Torque

04/12/2009 10:50 AM

What formula are U using?
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D C
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Join Date: Mar 2009
Location: Upstate NY, USA
Posts: 5
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#3

Re: Force / Preload vs. Torque

04/12/2009 3:08 PM

Good approximation can be found in "Mechanical Engineering Design" , Shigley, Joseph. See section 6.5 to 6.6 Or any other engineering text.
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phoenix911
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Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

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#4

Re: Force / Preload vs. Torque

04/12/2009 4:37 PM

Nook Industries has some calculators for these.

http://www.nookindustries.com/Engineering/Calculators.cfm

phoenix911

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Curious George
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Join Date: Apr 2009
Location: IL., USA
Posts: 24
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#5

Re: Force / Preload vs. Torque

04/13/2009 11:52 AM

http://www.wilcoxeng.com/tools.html

Here's another calculator that lets you select the fastner, type in the torque, and it returns the force. See the lower one on the linked page.

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 Half of everything in life is counter-intuitive,,, I'm not sure about the other half yet...
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