Standard_Parts_Catalogue

Page 1898 | 3.8 Adjusting, Moving with Guides, Spindles and Ball Rollers Telescopic Slides Technical Information Bending Telescopic slides demonstrate elastic bending under load in the extended state. The bending is most noticeable at the far end of the inner slide. The general rule is that the extent of deformation may not be higher than 4.25 % of the stroke path. All slides are within this value on maximum load. Example: A telescopic slide having a nominal length of l 1 = 500 mm is moved to the end position and stressed with the maximum load throughout the extension finish. The bending at the front-most point of the slide may now be a maximum of 21.25 mm. Load capacity The maximum load capacity of telescopic slides depends on the slide profile, the nominal length l 1 , and the resulting stroke l 2 . Furthermore, the extension width, the slide materials used, and the parts of the component options, such as the dampened self-retracting mechanism, have a considerable influence. The information on the maximum load capacity of the telescopic slides was determined in fatigue tests under the following conditions: • Slide arrangement vertical in pairs • Observance of all mounting information • Warp-resistant test set-up • Equal distribution of the load F S throughout the extension finish • Standard slide spacing of 450 mm • 10,000, 50,000 or 100,000 test cycles (one extraction and retraction = one cycle) • Gradual increasing of load Wear, performance, and maximum bending were assessed after every test segment. Travel speed The permissible extraction and retraction speeds of the telescopic slides are set at a maximum speed of 0.3 m/s. Shortly before the end of stroke, the speed should be reduced to less than 0.15 m/s so that the stops, rubber stops, dampened self-retracting mechanisms etc., do not have an excessive amount of impact stress. Tolerances All components of the telescopic slides are subject to manufacturing tolerances that ensure consistent quality and a long lifespan. Since the stroke results from the interaction of all individual parts of the telescopic slides, the sum of all individual to- lerances also has to be taken into account for the length tolerance of the stroke. In addition, slight deformation of any existing rubber stops should be mentioned. This results overall in proportionately large total tolerances that are listed on the respective catalog pages and can, therefore, be taken into account in the design layout of extensions.