PART 1: What is a Tool Holder?
A tool holder is a device that securely and accurately holds a cutting tool in place during the machining process. But its importance extends far beyond simply gripping the tool. A high-quality tool holder plays a crucial role in maintaining tool stability, precision and vibration damping—all of which are essential for achieving the exceptional results your customers demand. TOOL HOLDER ANATOMY
A tool holder system is made up of several components. Here are the main parts to know and their functions: + Pullstud/Retention Knob – a safety fastener that screws into the top of a tool holder, acting like a secure lock to keep the tool firmly attached to the machine during cutting operations. + Shank – the part that connects the tool holder to the machine spindle, ensuring a secure and stable attachment for accurate machining. + Taper/Flange – helps the tool holder fit securely into the machine spindle, ensuring proper alignment and stability during machining. A taper is a conical shape. The V-Flange is used by the machine ATC (Automatic Tool Changer) and must match the requirements of the machine tool. + Collet/Chuck – grips and secures the tool in place, ensuring it stays steady during machining. A collet is like a sleeve, and a chuck is like a clamp. + Drive Keys – the components that lock the tool holder to the spindle, maintaining tool tip orientation and transmitting torque from the machine to the tool holder.
PULLSTUD/RETENTION KNOB
SHANK
FLANGE/TAPER
COLLET/CHUCK
4 | CNC TOOL HOLDERS: A COMPREHENSIVE GUIDE FOR MODERN MACHINING
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