10/7/2015

OTT-Jakob Drawbar Features Intensified Spring Force

Originally titled 'Drawbar Features Intensified Spring Force'
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Advanced Machine & Engineering’s improved OTT-Jakob power drawbar for toolholding holds the cutting tool securely in the spindle taper with gripper fingers.

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Advanced Machine & Engineering’s improved OTT-Jakob power drawbar for toolholding holds the cutting tool securely in the spindle taper with gripper fingers. These fingers are pulled into the taper with the spring pack of the power drawbar. The pull-in force is multiplied by the mechanism. The spring force applied to the clamping sleeve pushes the balls outward. The angle design of the clamping ring and cylinder shoulder increases the spring force by 300 percent. The cam inside the spindle closes the gripper fingers, and the tool is securely locked.

Loss or reduction in hydraulic pressure will not release the tool. The power off design requires pressure applied to the hydraulic piston that is transmitted through the rod to push the clamping sleeve down. This unlocks the mechanism. 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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