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Topic Title: Hose Clamp Torque
Topic Summary:
Created On: 18 July 2013 05:03 PM
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 18 July 2013 05:03 PM
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philium

Posts: 6
Joined: 22 November 2006

What is the relationship between the torque of the screw and the force exerted by the band?
Thanks.
 26 July 2013 05:56 PM
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sandip

Posts: 21
Joined: 31 March 2013

If the force exerted by the band to the screw then the torque is directly proportional to the force.

Torque = Force x Radius of screw.

In the above relation Radius is constant.
 02 November 2013 05:36 PM
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HarryJMacdonald

Posts: 256
Joined: 15 May 2002

Surely the pitch of the thread is relevant.

For a 45° pitch they would be the same, for more realistic pitch the force on the band is greater (apart from a big dose of friction reducing it again)
 24 November 2013 01:41 PM
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kengreen

Posts: 400
Joined: 15 April 2013

Sorry, fellas,

At the moment I am not fit to pick this one apart; I suspect however that you are mixed up with sloppy use of terminology.

To begin with the operating screw - the torque which is applied is translated via the screw-pitch into a linear force applied to the end of the band; this results in the band becoming restricted around the neck of the vessel.

Next you must resolve that linear tension in the band into radial forces exerted by the band on the neck of the vessel?

To take it further you need data on such things as coefficients of friction between surfaces from which you can calculate the necessary force/torque that is required to enable the band to overcome the critical value of friction and so allow the band to slip?

Ken Green
 02 December 2013 03:16 PM
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sandip

Posts: 21
Joined: 31 March 2013

Hi Mr Ken

You are absolutely right as I only had mentioned basic relation T=d/2 x F


T=torque generated
d= mean diameter of screw
F=applied force
Now force of friction & helix angle of screw are related to W=load to be lifted or resistance faced by the screw.

Then F=W x tan(a+b)
a=friction angle, b=helix angle

Final Relation T=d/2 x W x tan(a+b)

This may help.

Sandip Roy MIET
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