Trapezoidal screws
Trapezoidal Screws
Trapezoidal screws are manufactured through turning or rolling, depending on the application requirements. The trapezoidal profile conforms to the UNI 2903 (DIN 103) standards.
The movement of the nut on the screw occurs through sliding, which is why these screws are not suitable for use at high rotational speeds. Thanks to the particular profile, TPN screws can be considered practically irreversible, a characteristic useful in many applications.
The screw-nut system finds numerous applications, particularly when axial displacement is required. The use of screws and nuts with multiple principles allows for the doubling or tripling of the axial displacement per turn, thereby increasing the translation speed of the system.
Important note on lubrication:
To ensure proper functioning and reduce wear on the screw/nut system, it is essential to always maintain a clean lubricant layer between the contact surfaces.
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Frequently asked questions
What is the difference between trapezoidal screws and ball screw systems?
The trapezoidal screw and the ball screw are both used to convert rotary motion into linear motion, but they operate differently.
- Trapezoidal screw: has a trapezoidal thread and works with a nut, usually made of bronze or technopolymer. It is an economical, robust, and quiet solution, but it has a lower efficiency due to the friction between the screw and the nut. In certain conditions, it can be irreversible, meaning it prevents the load from spontaneously rotating the screw.
- Ball screw: uses balls that roll between the screw and the nut, significantly reducing friction. It offers high efficiency, precision, and smooth operation, but generally comes at a higher cost and is typically reversible.
The trapezoidal screw is often suited for simple movements and applications where cost is a significant factor. The ball screw is preferable when greater precision, efficiency, and speed of movement are required.
Note: the potential irreversibility of a trapezoidal screw depends on the characteristics of the system and should not automatically be considered a safety device for load retention.
ATTI offers rolled trapezoidal screws and related nuts, as well as solutions with ball screws.
Check the categories in the ATTI catalog:
to compare the available solutions and find the one most suitable for your application.
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