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Calculating Compressive Force on a Bearing based on Applied Torque

Calculating Compressive Force on a Bearing based on Applied Torque

Calculating Compressive Force on a Bearing based on Applied Torque

(OP)
I am currently using a screw assembly as a bearing to push a small steel ferrule on to a plastic tube. As the screw turns it slowly pushes the ferrule down over the tube while the opposing force acts agains the engaged threads.

Currenly using about 40 in-lbs of torque to completly secure the ferrule all the way on the tube (only a little more than .1" of total travel distance).

I want to change the assembly to a press fit action and eliminate the screw all togeather but I am not sure how to figure out the appropriate compessive force I am going to need.

Thanks for all the help.

RE: Calculating Compressive Force on a Bearing based on Applied Torque

Hi Shinner

Well roughly speaking you can estimate the axial force from the torque using this equation:-

F = T/(0.2*d)

where F= axial load

      T = torque

      d = thread dia

      0.2= friction factor for dry threads

If you know your interference you can use this calculator:-

http://www.meadinfo.org/2009/07/press-fit-pressure-calculator-optimize.html

desertfox

RE: Calculating Compressive Force on a Bearing based on Applied Torque

The above formula applies to steel UNC threads or similar with light machine oil lubrication.  (The 0.2 constant particularly).

However it should get you sufficiently close to design for a pure axial load installation.

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