Röhm - Power chucks and cylinders - steady rests Page 213
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General information and guidelines Power-operated clamping devices To ensure safe operation of power-operated clamping devices, particularly of chucks, on heavy-duty lathes with high speeds certain criteria must be observed: 1. Whenmounting the power chuck and the clamping cylinder on the lathe, the following safety requirements must be met: 1.1 The machine spindle may only start when the clamping pressure has been built up in the actuating cylinder and the clamping has been carried out in the permissible working area. 1.2 Unclamping may only be possible when the machine spindle has completely stopped. 1.3 In case of a clamping energy failure, the workpiece must be firmly clamped until the spindle is completely stopped. (The Röhm safety cylindersmeet this requirement.) 1.4 In case of a current failure and upon return of the current supply the actual control position may not be changed. 1.5 In case of a clamping energy failure the machine spindle must be stopped by a signal. 2. The safety instructions given in the respective operation manual must be precisely followed. www.eshop.roehm.biz Power-operated clamping devices 3. After havingmounted the chuck and before starting the operation, the function of the chuck must be checked. Two important points are: 3.1 Clamping force The clamping force (±15%) stated for the clamping devicemust be reached atmax. actuating force/pressure. 3.2 Stroke control A safety range must be provided for the stroke of the clamping piston in the front and rear end position. The machine spindle may only start after the clamping piston has crossed the safety range. Only limit switches meeting the requirements for safety limit switches in accordance with VDE 0113/12.73 section 7.1.3 may be used for monitoring the clamping path. 4. If themax. speed of the lathe exceeds themax. speed of the clamping device or clamping cylinder, the machine must be equipped with a speed limitation device. 5. When the clamping device has been changed, the stroke control must be adjusted to the new condition. 6. When calculating the required clamping force formachining a workpiece, the centrifugal force of the clamping jaws must be considered. 7. A reliable operation of the power chuck can only be guaranteed when themaintenance instructions contained in the instruction manual are precisely followed. In particular the following points must be observed: 7.1 For the lubrication only the lubricants recommended in the operation manual shall be used. (An unsuitable lubricant can reduce the clamping force by more than 50%). 7.2 The lubricationmust reach all surfaces to be lubricated. (At the narrow fits of themounting parts a high pressure is required for pressing-in the lubricant. For those purpose a pressure gun must be used). 7.3 In order to distribute the grease evenly, actuate the clamping piston several times to its end positions, repeat the lubrication and then check the clamping force. 6211
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