Instead of the worm drive systems discussed here, a bevel gear system could be used to convert rotation to linear motion. This would offer greater effectiveness to a machine screw jack because of it producing a rolling contact as opposed to the sliding contact of worm drive components. It could, however, come at a greater initial cost and will not cover as better ratio range as worm drives.
Also known as power screws, lead screws include 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 angle and are commonly found in American Imperial machine screw jacks. An alternative solution to the Acme screw jack china business lead screw in a machine screw jack will 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 standard.
Ball screw jacks require the thread of the business lead screw to have a profile that allows for the travel of the balls. To improve load distribution and minimise put on, the ball screw track has a gothic arch profile.
Reputation of the trapezoidal screw thread originates from the fact that it is simpler to machine and is therefore less expensive than square and ball screw thread forms. Additionally, because of the large area of contact between your lead screw threads and the worm wheel, there can be a large load carrying capacity. This results in high friction which is definitely detrimental to efficiency but does mean the system is more likely to become self-locking. This low performance means that this kind of 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 constructed of the frequency of actuation and this will stage to the appropriate screw jack to become selected.

Translating Design Jacks ‘re normally selected. With this design, a driven insight worm works on an internal worm gear leading to the lifting screw to extend or retract. Operation requires that rotation of the lifting screw be avoided. This rotation it restrained whenever two or more jacks are linked with the same load.
Keyed Style Jacks are used any time 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: An integral, fixed to the jack casing and inserted into a keyway milled in to 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 have a fixed size lifting screw that rotates. Loads are attached to a flanged “touring” nut that translates along the distance of the rotating screw. This type 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 technique offers greater effectiveness between the input and the useful output weighed against a machine screw jack. Furthermore, it allows for higher actuation speeds and, due to the low friction, is very durable. However a ball screw jack is not inherently self-locking and, as a consequence of its improved precision components, the initial outlay is greater. The resulting improved effectiveness however implies this can be offset against smaller drive train components and a significant reduction in the necessary power.