Röhm Main Catalogue Clamping Technology Page 717
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Determining the required gripping force of a power chuck Power-operated clamping devices Determining the required gripping force of a power chuck and the corresponding operating power I) Calculating the gripping force Fspz (without considering the effects of angular speed) required for the job (machining operation). II) Determining the chuck’s initial gripping force Fspo with spindle stationary (taking into account the centrifugal forces of the jaws). III) Determining the operating power required to provide the initial gripping force Fspo. Definition of gripping force Progress in machining techniques has made it necessary for safety reasons not only to determine the necessary gripping force but also to know and consider its change with increasing angular speed. The forces and moments generated by the machining operation must be properly absorbed and transmitted by the chuck. The chuck accomplishes this task mainly by producing a gripping force: This gripping force is the arithmetic sum of the radial forces exerted on the workpiece by the jaws. The initial gripping force Fspo produced when the chuck is stationary can be measured at any time and is therefore control-lable. (Denoted by ’total gripping force’ in the gripping force / operating power diagrams). The figures given in the catalogue refer only to chucks that are fully and correctly lubricated and in a properly serviced condition. Many factors act on the clamping point during any machining operation. A precise specification of these factors in the form of universally applicable tables is not possible in this context. In most cases it is sufficient in practice to use a simplified formula containing the fundamental determining factors (crude determination). = Main cutting force on radially applied tool Power-operated clamping devices Fs FsBo = Cutting force on axially applied tool (drill) Fvax = Feeding force on axially applied tool Fspz = Required total gripping force (without considering the effects of angular speed Fc = Centrifugal force of the jaws = Loss of gripping force (see gripping force/speed diagram of each chuck Typee Fspo = (Total) initial gripping force with the chuck stationary lz = Distance betwwen machining and clamping points dz = Machining diameter dsp = Chucking diameter lsp = Chucking length www.eshop.roehm.biz 6203
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