Power Drawbar Uses Spring Force to Lock in Tools

The Ott-Jakob power drawbar from Advanced Machine & Engineering features intensified spring force to securely hold the cutting tool in the holder.

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The Ott-Jakob power drawbar from Advanced Machine & Engineering features intensified spring force to securely hold the cutting tool in the holder. Gripper fingers hold the tool in the spindle taper and then are pulled into the taper with the drawbar’s spring pack.  A patented intensifying mechanism multiplies the pull-in force. The spring force applied to the clamping sleeve pushes the balls outward. The angle design of the clamping ring and cylinder shoulder increase the spring force. The cam inside the spindle then closes the gripper fingers, securely locking the tool.

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