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How to avoid the shank failure

Nov 28, 2019

The tool holder is the key interface between the cutting tool and the machine tool spindle. Failure of the tool holder will cause the tool holder to fail to function, resulting in shorter tool life and unreliable cutting processes.

 tool(alles cnc)

Typical tool holder failures have the following forms:

  • Chips are wrapped around the shank, and the shank becomes worn due to friction between the shank, the workpiece and the chip.

  • Intermittent cutting forces cause surface fatigue on the shank.

  • Deformation of the shank due to cutting force.

  • Cutting heat and cutting temperature cause a phase change in the material structure of the tool holder.

  • Oxidation and corrosion of tool holders.

  • Wear of spare parts, accessories and connection surfaces.


Practical guidelines for tool holder maintenance:


1. Regularly clean all accessories and spare parts, tool holder (handle and head) and spindle. Apply a layer of oil when not in use to prevent oxidation.


2. Store the handles in a clean, dry place.


3. Visually check the wear of the shank, such as traces of fretting corrosion. Visually view all accessories and spare parts at the same time: bushings, spindle studs, nuts, etc., and replace them if necessary.


4. Always use specific installation and removal equipment.


5. Do not twist the screw excessively, and it cannot exceed its given torque limit. The screw wrench cannot be clamped without torque.


6. Do not exceed the recommended screw revolutions of the hydraulic clamping system. Regularly regulate the pressure of the hydraulic chuck with a calibrated instrument.


7. Don't let the fixture overheat.


8. Follow the instructions for use of the tool.

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