Clamping glossary Extra long jaw stroke: The extra long jaw stroke allows a long radial movement of the master jaws of the Big Bore 2G chuck. It can be either a fully usable clamping jaw stroke or a combination of rapid stroke and clamping stroke. An extra long jaw stroke allows safe loading and unloading of the pipe. Individual stroke control for each jaw: In compensating clamping mode, all 3 jaws of the Big Bore 2G chucks make a different radial movement to compensate for the misalignment of the pipe to be clamped. A single central jaw stroke control cannot detect if the jaw stroke on one of the master jaws bottoms out and yet cannot hold the pipe in the requested position anymore. The individual stroke control for each jaw ensures that all 3 jaws are within the correct clamping stroke and will clamp the pipe safe and accurate. The signals are picked up by proximity switches, and are monitored by the air control unit.
Stroke control for the retracted jaws: On the 6 jaw sequence chuck Big Bore FZA2G, the centering jaws are used only in static mode to align the pipes machining area to the center line of the machine. The pipe position is maintained when the compensating jaws clamp. The centering jaws are then retracted to allow threading at the centered area. In order to make sure that the centering jaws are retracted and do not interfere with the threading tool during machining, the retracted position of the centering jaws is monitored by a stroke control system via a proximity switch. Pressure control: During the machining of a pipe, the air pressure to create the gripping force is maintained by a built in safety valve system. In case there is a drop in clamping pressure, a built in pressure control will detect the low pressure and pick up an alarm signal via proximity switch. All Big Bore 2G chucks have such a pressure control as a standard feature.
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SMW-AUTOBLOK 375
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