Ball screws convert rotational and linear motion
Misumi Europa supplies a variety of ball screws for converting rotational motion into linear motion and vice-versa. They consist of a threaded spindle, a ball screw nut, with integrated balls, and a ball recirculation mechanism, and are available in application-specific variants.
Ball screws are the most commonly used threaded spindles in industrial and precision machines. According to Misumi, the components, which are used as drive and feed units, are characterised by low-friction and precise motion. At a high accuracy level, the mechanical efficiency is said to reach 98% while the reverse efficiency for converting longitudinal motion to rotational motion is as much as 85%. In addition, ball screws only require a low drive torque.
The low-wear rolling friction of the spherical rolling elements is said to result in a long service life, low self-heating and low lubrication requirements. According to Misumi, the stick-slip effect, which is often undesirable in technical applications, is ruled out thanks to the low static and dynamic friction coefficients.
Misumi's ball screws with rolled and ground shafts come with a number of different thread diameters and pitches for various feeding, positioning and transporting tasks. In addition, connection and peripheral components such as fixed and movable bearings, spacer rings and plates for movable bearings, along with bearing blocks, supports and stops for ball screws are also supplied.
Rolled ball screws with precision classes C10 and C7 are a cheaper variant; ground ones, on the other hand, enable greater precision. Versions in classes C7, C5 and C3 are available and Misumi offers application-specific shaft end design with the Configurable Components feature. From stepped, stepped annular groove, threaded hole and spanner flats on one or both sides, users have the choice of a variety of freely-combinable forms, which can be adapted to exact size specifications.
For applications requiring particularly strong corrosion protection, certain spindle types with low temperature black chrome plating are available. With the LTBC plating technology with layer strengths in the µm range, which are applied after the shaft is machined, the component geometries remain unaltered and the original properties of the material stay fully intact. LTBC-plated components are characterised by an optimised relationship between hardness and elasticity; they are tear resistant and largely resistant to reversed bending on the surface. The layer is bonded inseparably to the surface by means of a diffusion process and the optimised corrosion inhibition properties are guaranteed for over 10 years.
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