Röhm Main Catalogue Clamping Technology Page 720
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Determining the required gripping force of a power chuck Power-operated clamping devices Safety factor Sz The magnitude of the safety factor Sz depends on the degree of accuracy with which the influencing parameters, such as load, chucking coefficient etc., can be determined and on the degree of safety required. > 2 wherever possible. It should be = Safety factor Sz (approximate) Table 5 Influencing parameters New chucks Safety factor Sz Older chucks serviced regularly a) overhung chucking lz ≤ dsp b) no radial support from tailstock c) tool applied radially d) no axial seating of workpiece against jaws e) ratio: chucking length to distance between cutting and clamping points lz lsp ≤ 3 lz lsp ≥ 3 ≤ 6 > 2.0 = > 2.4 = > 4.0* = > 4.8* = * Lower safety factors can be applied if the workpiece is supported in the tailstock or axially seated against the jaws. Superimpositions of alternating forces are neglected because their influence is very small in comparison with the total gripping force required. Power-operated clamping devices The safety factors so determined are applicable if the following requirements are met: Chuck in perfect condition, no damage, adequately lubricated (operating instructions followed to the letter). No allowance has been made for the following loads acting on the chuck: a) Unbalanced forces and moments produced by unsymmetrical workpieces b) Weight of workpiece For a precise calculation of the gripping force required for a given job, use VDI Recommendation 3106. Available from: Beuth-Verlag GmbH, Kamekestraße 8, D-50672 Köln, Germany. II) At high speeds, the gripping force of the rotating lathe chuck is greatly influenced by the centrifugal forces of the jaws. These forces must be taken into account when determining the initial gripping force Fspo The applicable formula is: FSPO = SSP x (FSPZ ± FC) The + sign applies to external gripping. The - sign applies to internal gripping. 6206 www.eshop.roehm.biz
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