Instead of the worm drive systems discussed here, a bevel gear system could possibly be used to convert rotation to linear movement. This might offer greater effectiveness to a machine screw jack because of it producing a rolling contact as opposed to the sliding contact of worm drive elements. It could, nevertheless, come at a larger initial cost and will not cover as higher ratio range as worm drives.
Also referred to as power screws, lead screws come with a number of different types of thread profile which are ideal for different applications. Acme lead screws are defined by their trapezoidal thread profile and 29° flank position and are commonly found in American Imperial machine screw jacks. An alternative to the Acme business 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 angle and complies to an ISO metric regular.
Ball screw jacks require the thread of the business lead screw to get a profile which allows for the travel of the balls. To improve load distribution and minimise use, the ball screw monitor has a gothic arch profile.
Reputation of the trapezoidal screw thread comes from the fact that it is easier to machine and is therefore more economical than sq . and ball screw thread forms. Additionally, because of the large area of contact between the lead screw threads and the worm wheel, there is certainly a big load carrying capacity. This results in high friction which is certainly detrimental to efficiency but also means the system is much more likely to become self-locking. This low efficiency means that this kind of screw jacks are more suitable for non-continuous or intermittent operation.

Many applications do not warrant the excess expenditure of a ball screw jack since they usually do not require continual drive. In configuring a screw jack a prediction is made from the frequency of actuation which will stage to the appropriate screw jack to become selected.

Translating Design Jacks are most often selected. With this style, a driven input worm functions on an interior worm gear causing the lifting screw to extend or retract. Operation requires that rotation of the lifting screw become avoided. This rotation it restrained whenever two or more jacks are linked with the same load.
Keyed Style Jacks are used any moment rotation of the lifting screw is not restrained. For example, when you need to lift the jack to meet up a load. This is one way they work: A key, set to the jack housing and inserted right into a screw jack china keyway milled into the amount of the lifting screw forces the lifting screw to translate without rotating.
Keyed For Travelign Nut Style Jacks (KFTN) are another option. These jacks have a fixed length lifting screw that rotates. Loads are mounted on a flanged “journeying” nut that translates along the distance of the rotating screw. This kind of jack is perfect for applications that cannot accommodate a screw safety tube or that require 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 higher actuation speeds and, due to the low friction, is quite durable. Nevertheless a ball screw jack isn’t inherently self-locking and, as a consequence of its improved precision components, the original outlay is better. The resulting improved efficiency however implies this could be offset against smaller sized drive train parts and a significant reduction in the necessary power.