As opposed to the worm drive systems discussed here, a bevel equipment system could be used to convert rotation to linear movement. This might offer greater efficiency to a machine screw jack due to it making a rolling contact as opposed to the sliding contact of worm drive elements. It could, however, come at a larger initial cost and does not cover as better ratio range as worm drives.
Also known as power screws, lead screws include several 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 screw jack china American Imperial machine screw jacks. An alternative to the Acme business lead screw in a machine screw jack will be a square lead screw.
European or other international 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 lead screw to get a profile which allows for the travel of the balls. To enhance load distribution and minimise put on, the ball screw track has a gothic arch profile.
Recognition of the trapezoidal screw thread originates from the fact that it’s easier to machine and is therefore more economical than square and ball screw thread forms. Additionally, due to the large area of contact between your business lead screw threads and the worm wheel, there is a big load carrying capability. This outcomes in high friction which is usually detrimental to efficiency but also means the system is much more likely to become self-locking. This low performance means that this kind of screw jacks are more suited to noncontinuous or intermittent operation.

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

Translating Design Jacks are most often selected. With this design, a driven insight worm functions on an interior worm gear causing the lifting screw to extend or retract. Operation needs that rotation of the lifting screw end up being prevented. This rotation it restrained whenever two or more jacks are linked with the same load.
Keyed Style Jacks are utilized any time rotation of the lifting screw is not restrained. For instance, when you must lift the jack to meet a load. This is how they work: A key, fixed 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 have a fixed size lifting screw that rotates. Loads are attached to a flanged “vacationing” nut that translates along the space of the rotating screw. This type of jack is perfect for applications that cannot accommodate a screw protection 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 efficiency between the input and the useful output weighed against a machine screw jack. Furthermore, it allows for greater actuation speeds and, because of the low friction, is quite durable. Nevertheless 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 efficiency however implies this is often offset against smaller drive train elements and a significant decrease in the necessary power.