XL CATALOG

Loading Nut, contact points F ext F ext Another key aspect for the correct performance of the ball screw is the lubrication. In Loading ball screws the most common lubrication option is to use grease. It is important the grease to have good anti-wear and anti-corrosion additives to protect the raceways correctly. The recommended grease quantity is the following: · IML: Q grease = V int [cm 3 ] · HDL/PKL: Q grease V int [cm 3 ] In HDL & PKL technologies, it is recommended to fill the inside of the nut with grease. They are usually very long nuts and for a correct greasing reaching to the end of the nut correctly, several radial holes are made in the body of the nut, every 100mm or so, so it is usual to design a nut of more than 500mm with 5 lubrication holes. Another lubrication possibility is the oil bath or fluid grease lubrication. If it is required shaft and nut temperature to be kept as stable as possible, the ideal is to immerse the ball screw in an oil bath, or in a fluid grease bath if it is required a greater layer of film for when it works with low speeds, thus better protecting the raceways. It is especially interesting in cases where a considerable heat generation is expected, due to a high average speed; especially if the load that the ball screw has to bear is so high that it is necessary to put a large number of circuits, with very long nuts where any temperature variation between the nut and the shaft can cause the load not to be distributed evenly between the different circuits. A clear example is plastic injection. For more information on lubrication, please consult pages 52-55 of the Technical description catalogue, or consult SHUTON·IPIRANGA Engineering Department. 2 3 TS, Loading Non Preloaded Single Nut TS, Loading Non Preloaded Single Nut, B-type recirculation Lubrication 16