As opposed to the worm drive systems discussed here, a bevel gear system could possibly be used to convert rotation to linear motion. This might offer greater effectiveness to a machine screw jack due to it making a rolling contact as opposed to the sliding contact of worm drive components. It could, however, come at a larger initial cost and does not cover as greater ratio range as worm drives.
Also known as power screws, lead screws come with a number of different types of thread profile which are ideal for different applications. Acme business 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 solution to the Acme 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 possess a profile which allows for the travel of the balls. To improve load distribution and minimise use, the ball screw monitor includes a gothic arch profile.
Reputation of the trapezoidal screw thread comes from the fact that it is simpler to machine and is therefore less expensive than sq . 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 definitely a huge load carrying capacity. This results in high friction which is certainly harmful to efficiency but does mean the system is much more likely to become self-locking. This low effectiveness implies that such screw jacks are more suited to noncontinuous or intermittent operation.

Many applications 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 of the frequency of actuation which will point to the correct screw jack to be selected.

Translating Design Jacks are most often selected. With this style, a driven insight worm works on an internal worm gear causing the lifting screw to extend or retract. Operation requires that rotation of the lifting screw become 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 example, when you must lift the jack to meet up a load. This is how they work: An integral, fixed to the jack housing and inserted right into a keyway milled in to the amount 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 length lifting screw that rotates. Loads are attached to a flanged “vacationing” nut that translates along the distance of the rotating screw. This kind of jack is ideal for applications that cannot support a screw protection tube or that require a flush mount
The worm wheel acts on the ball screw (via the ball nut) which actuates the lead screw. This system offers greater effectiveness between the input and the useful result compared with a machine screw jack. In addition, it allows for greater actuation speeds and, due to the low friction, is very durable. screw jack china however a ball screw jack is not inherently self-locking and, because of its enhanced precision components, the initial outlay is better. The resulting improved performance however implies this can be offset against smaller sized drive train elements and a significant reduction in the necessary power.