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It should be noted that calculated here is the ideal mechanical advantage and does not take into account the large frictional losses due to the large area of contact between the male and female threads.

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A screw is a mechanical system that converts rotational motion in to linear motion. In other worlds it converts torque (rotational force) in to a linear force.

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On this page you can find detailed information about the "Edwards Pro-Tech Ltd". You can call the company by phone Edwards Pro-Tech Ltd (519) 758-8220 or send a fax to (519) 770-0270. "Edwards Pro-Tech Ltd" is located in Brantford. Edwards Pro-Tech Ltd described in the category Tools. For a letter, use the address 20 Kenyon St, Brantford, Ontario N3S 7R8, Brantford, ONTARIO N3S 7R8

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A very important property of a screw thread is that it can be used to amplify force: A small torque applied to a screw can exert a large axial force on a mass. Therefore, a threaded component is said to produce a Mechanical Advantage.

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Lead – The axial distance travelled by the thread during 360° revolution of the screw or nut. The smaller the lead, the higher the mechanical advantage. (Lead = Pitch X No. of Starts)

Therefore, it can be seen that the ideal mechanical advantage is given by: $$MA={F_{out}\over F_{in}}={2\pi r\over l}$$ Therefore the smaller the thread lead, l, the greater the mechanical advantage and the larger the force the screw thread can exert for a given applied rotational force.

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However, we know that the applied rotational force is supplied by a torque T, where: $$T_{in}=F_{in}r$$ This assumes that the lever arm for the torque is r, the radius of the thread. Substituting this in to the equation for mechanical advantage gives the resultant axial force out of the system: $$F_{out}={T_{in}2\pi \over l}$$ So it can be seen that the resultant axial force increases as the input torque increases and the thread lead decreases.

Kelston Actuation specialises in custom screw jacks, modular lifting system components and linear actuator products. We design and manufacture all products from our site in Bristol, UK, and work with customers worldwide. Our legacy of precision manufacturing stretches back more than 40 years.

(UK) 0117 947 3100 sales@kelstonactuation.com Business Hours (UK) Mon to Thu 07:30 - 17:00 Fri 07:30 - 16:00

Although ‘screw’ refers to many helical devices, in its simplest form it consists of helical threads around a cylindrical shaft (male/external thread) and its purpose is to fasten components together. At least one of these components to be fastened together contains an internal/female thread and this may be formed during the installation of the screw if the material is softer than that of the screw. This differs to the definition of a bolt which is a similarly threaded component used to fasten un-threaded components together with the use of a nut. In both cases, rotation of the threaded component, through the application of torque, results in relative movement between it and the female thread and the screw/bolt moves along its axis.

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From the conservation of energy, the work done on the screw by the rotational input force equals the work done on the mass by the resulting axial force: $$W_{in}=W_{out}$$ Work done equals the force multiplied by the distance over which it acts so, for 1 complete revolution, the work done is given by: $$W_{in}=2\pi r F_{in}$$ And the work done on the mass by the axial force is given by: $$W_{out}=l F_{out}$$

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The property of a screw in that it can provide a mechanical advantage can be applied to components that utilise screw threads. Such components include Screw Jacks (also known as Jack Screw, a Worm Screw Jack, a Machine Screw Jack or a Lead Screw Jack).