As opposed to the worm drive systems discussed here, a bevel gear system could possibly be used to convert rotation to linear motion. This would offer greater efficiency to a machine screw jack due to it making a rolling contact instead of the sliding contact of worm drive parts. It could, nevertheless, come at a greater initial cost and does not cover as greater ratio range as worm drives.
Also called power screws, lead screws include a number of different types of thread profile which are ideal for different applications. Acme business lead screws are described by their trapezoidal thread profile and 29° flank angle and are commonly within American Imperial machine screw jacks. An alternative to the Acme lead screw in a machine screw jack would be a square lead screw.
European or other worldwide screw jacks utilise a trapezoidal lead screw with a 30° flank position and complies to an ISO metric regular.
Ball screw jacks require the thread of the business lead screw to have a profile that allows for the travel of the balls. To enhance load distribution and minimise wear, the ball screw monitor includes a gothic arch profile.
Popularity of the trapezoidal screw thread originates from the fact that it’s easier to machine and is therefore more economical than sq . and ball screw thread forms. Additionally, because of the large region of contact between the business lead screw threads and the worm wheel, there is usually a big load carrying capability. This results in high friction which is certainly harmful to efficiency but does mean the system is more likely to become self-locking. This low performance means that such screw jacks are more suited to non-continuous or intermittent operation.

Many applications do not warrant the excess expenditure of a ball screw jack given that they do not require continual drive. In configuring a screw jack a prediction is made from the frequency of actuation and this will point to the correct screw jack to be selected.

Translating Design Jacks ‘re normally selected. With this design, a driven input worm functions on an internal worm gear leading to the lifting screw to extend or retract. Operation needs that rotation of the lifting screw become prevented. This rotation it restrained whenever two or more jacks are linked with the same load.
Keyed Design Jacks are used any moment rotation of the lifting screw isn’t restrained. For instance, when you must lift the jack to meet a load. This is one way they work: A key, set to the jack casing and inserted into a keyway milled into the length of the lifting screw forces the lifting screw to translate without rotating.
Keyed For Travelign Nut Design Jacks (KFTN) are another option. These jacks possess a fixed length lifting screw that rotates. Loads are attached to a flanged “touring” nut that translates along the space of the rotating screw. This type of jack is perfect for applications that cannot support a screw security tube or that want a flush mount
The worm wheel acts on your golf ball screw (via the ball nut) which actuates the lead screw. This system offers greater effectiveness between the insight and the useful result weighed against a machine screw jack. In addition, it allows for greater actuation speeds and, because of the low friction, is quite durable. However a ball screw jack isn’t inherently self-locking and, because of its enhanced precision components, the original outlay is higher. The resulting improved performance however implies this could be offset against smaller sized drive train elements and a significant reduction in the necessary power.