9/2/2014

Power Drawbar Features Intense, Spring-Force Mechanism

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Advanced Machine & Engineering introduces the OTT-JAKOB power drawbar for toolholding, which features power-off clamping and zero load on spindle bearings during tool change.

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Advanced Machine & Engineering introduces the OTT-JAKOB power drawbar for toolholding, which features power-off clamping and zero load on spindle bearings during tool change.

The cutting tool is held securely in the spindle taper with gripper fingers that are pulled into the taper with the spring pack of the drawbar. The pull-in force multiplies from the intensified spring force mechanism and is applied to the clamping sleeve to push the balls outward. The compact angle design of the clamping ring and cylinder shoulder is said to increase the spring force 300 percent, and with minimal rotating mass. The cam inside the spindle then closes the gripper fingers and the tool is securely locked.

The power-off design requires pressure applied to the hydraulic piston for transmission through the rod to push the clamping sleeve down, which unlocks the intensifying mechanism. This means that a loss or reduction in hydraulic pressure will not release the tool. Only after clearing the cam, the gripper fingers open and the face of the holder ejects the tool with a controlled stroke.

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