Röhm - Power chucks and cylinders - steady rests Page 214
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General information and guidelines Power-operated clamping devices 8. Before restarting a serial machining operation and in between the maintenance intervals the clamping force should be checked by means of a load cell. ”Only regular checks ensure optimum reliability”. 9. It is recommended to move the clamping piston several times to its end positions after 500 clamping strokes at the latest. (In this way any lubricant pushed away will be returned to the pressure surfaces. The pressure force is thus maintained for a longer period of time.) 10. When using special clamping jaws the following instructions must be observed: 10.1 The clamping jaws should be designed in such a way that their weight and height is as low as possible. The clamping point should as possible be as close to the frontside of the chuck. (Clamping points at a larger distancemay cause a higher surface pressure in the jaw guiding mechanism and may thus reduce the clamping force considerably.) 10.2 In case the special jaws are for constructional reasons wider and/or higher than the step jaws assigned to the clamping device, the resulting higher centrifugal forcesmust be considered when calculating the required clamping pressure and the rated speed. For calculating the rated speed for a certainmachining task the following formula is to be applied: nmax. = F spo -- F spz . m . rc . a 30 Power-operated clamping devices Fspo = initial clamping force with the chuck at standstill (N) F spz = required clamping force with the chuck at standstill for a certain machining task (N) n max. = max. admissible speed (min 1) m = mass of the entire jaw unit (kg) (base and top jaw) rc = center of gravity radius of the entire jaw unit (m) a = number of jaws 10.3 Welded jaws should not be used. If required, the welding seamsmust be checked as to their centrifugal and clamping force capacity. 10.4 Themounting screwsmust be arranged in such a way that the highest possible useful moment is reached. 11. Themax. speedmay only be used atmax. applied actuating force and with properly functioning chucks. 12. In case of high speeds the chucks may only be used below a protective hood with sufficiently large dimensions. 13. For power chucks with a jaw quick-change feature internal to the chuck a safety device is required which revents the machine spindle from rotating when the clamping jaws are released. 14. After a collision the clamping devicemust be checked for fissures before being used again. 15. Worn or damaged jaw fixing bolts must be replaced. Only use bolts of quality 12.9. 6212 www.eshop.roehm.biz
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