An Acme thread is a type of screw thread that is commonly used for lead screws in precision machinery, such as in CNC machines or other types of precision linear motion devices. The thread form is characterized by a 29-degree thread angle and a flat crest and rounded root. The lead angle of an Acme thread is shallower than other thread forms, which allows for smoother and more precise movement. Additionally, Acme threads have a larger contact area than other thread forms, which results in less wear and greater load carrying capacity. They are also well suited for use in applications where vibration or back-driving may be a concern. Due to the unique properties of Acme threads, they are often used as leadscrews in CNC machines, actuators, jacks, and other power transmission applications.
