A round screw, like a lead screw, converts rotary motion into straight activity. The gadget includes a threaded shaft and a ball nut. The last device rides on the screw, sustained by a collection of round bearings that supply a rolling surface area instead of the sliding surface area of a lead screw. The spheres roll between the nut and shaft. Due to the fact that there is no gliding activity, ball screws run more efficiently than lead screws. This is their terrific benefit. The efficiency of ball screws is relatively constant and is typically better than 90%.
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Ball screws are commonly the first choice for linear-motion applications because utilizing recirculating sphere bearings provides high performance, loads capacity, as well as placing accuracy. Moreover, ball screws normally offer equal or better load capability than leadscrews, and so are a better option when load demands surpass leadscrew abilities.
One disadvantage to ball screws is that they need high levels of lubrication. Ball screws should always be properly lubed with a proper formula to prevent deterioration, make sure reliable operation, lower friction, as well as extend operating life. Reaction, that bit of play between a number of mechanical parts, can be got rid of with preloading.
A few ball-screw terms, such as circuits, lead turns, pitch, as well as starts, are commonly used, and misused terms that evaluate various aspects of sphere screw settings up. Although these terms relate, each has a unique definition and significance to ball-screw layout and efficiency.
Lead, as well as pitch, belong yet various specifications. Lead refers to the linear range that took a trip for every full turn of the screw, while pitch is the distance between screw strings. These terms are usually used mutually, and single-start screws lead, as well as pitch, are equal. Nevertheless, lead and pitch are not equivalent to screws with numerous beginnings. Ball screws are generally available in tool leads between 0.200-0.500 in./rev, although high-helix products exist.