What Are Some Typical Screw Types, And What Do They Do?

With a ball bearing rotating between the leadscrew and the bearing, a ball screw is a higher flow screw. Compared to standard sliding screws, this product will present a third or less driving torque. This produces a motor drive that uses the least energy. Screw (linear, roller, or acme/lead), belts, and linear motors are the most popular types of linear propulsion,

Ball Screws (250 x 250 ball screw)

Ball screws work by turning the shaft, which is stationary in the transverse direction, to rotate the ball nut, which converts rotary motion into linear motion. Sometimes, the shafts are driven while the ball nut is turned. As opposed to the acme screws, which are prone to rolling friction, steel balls are placed between the grooves to create rolling contact with very little friction. Return tubes near the outside, deflectors inside the nut screws, or rubber stoppers at opposite ends are used to redirect the balls within the ball nut. One or more pairs of balls may make up each circuit in which the balls are circulated. The holding capacity increases with the number of rows of balls.

Finely coarse head or rolled are two standard terms for ball screws. Precision ground kinds are more pricey than the usual ones and offer greater accuracy. They can be categorized as either preloading methods or recirculating ball methods.

Roller screws

Low-friction devices include roller screws, sometimes known as satellite roller screws. They are frequently employed in electro-mechanical servomotors as a serving mechanism. However, they are suited for high accuracy, better speed, bulky load, long-lasting, and heavy applications while being complex and expensive.

The screw rollers are usually of two types, threaded or grooved. For a given load capacity, roller screws can be more compact and offer more gripping ends than ball screws. They can outperform ball screws in terms of longevity, speed, acceleration, rigidity, and positioning accuracy.

(Acme) Lead Screws

Although less precise, inefficient, and with a lower load capacity than ball screws, lead screws offer a more straightforward, quieter, and affordable option. They are suitable for applications, such as vertical loads, that can support the lead screws better.

The thread type is often used to categorize lead screws. Compared to Acme screws that are carved at an acute angle Vee threads produce more friction. Square threads have a high cost and are difficult to produce, but they are less frictional. They are practical and are employed for screws that need a lot of power.