Tooling & Workholding

Toolholders

The Toolholder is the essential connection between the machining center and the cutting tool. The toolholder fits into and is secured by the machining center’s spindle, and in turn secures the cutting tool such as a drill or end mill by clamping onto its shank. The taper of the toolholder matches the toolholder interface of the particular spindle. Toolholder tapers are often conical, including CAT and BT taper specifications. A different kind of taper, HSK, is not tapered at all, but instead includes a variety of flanges for securely locking the toolholder in place. Toolholders use different mechanisms for clamping the tool. A set screw can clamp onto a corresponding flat in the tool’s shank. Or, a collet can be compressed around the tool by tightening a nut that also surrounds the tool. More unusual clamping mechanisms include hydraulic toolholders, which compress a bladder of hydraulic fluid, as well as shrink fit toolholders, which clamp and release the tool by heating and cooling the toolholder’s metal to take advantage of thermal expansion and contraction. Other toolholder types use still other methods of clamping. Various clamping mechanisms aim to provide not just secure holding of the tool, but also tool concentricity to the centerline of the spindle that is accurate to a level of runout error appropriate to the tool and the machining process.

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Featured Zone Content

Gripper for machine tool

Video: Parts Gripper Allows Machine To Act As Its Own Robot


This footage shows a workpiece gripper that enables a machine to load and unload workpieces on its own.

toolholder balancing machine

Video: Balancing Tools And Toolholders


This video provides both the argument and methodology for performing offline balancing of tool/toolholder assemblies for high speed machining centers.



Bilz TER ThermoGrip shrink-fit collets

Shrink-Fit Collets Preset Required Tool Length

By: Edited by Stephanie Monsanty
The TER ThermoGrip shrink-fit collets from Bilz feature solid bodies that are not deformed or compressed when clamping, the company says.

Parlec Eros toolholding system

Toolholding System Offers High Performance at Fast Speeds

By: Edited by Stephanie Monsanty
Parlec’s high-performance Eros toolholding system is said to offer high velocity, improved cutting performance and longer tool life.

Hyper-Change Quick-Change System for Form Tools

By:
The Hyper-Change from Fischer Special Tooling is a quick-change system that makes tooling changes faster and more repeatable for consistent positioning of form cutting tools.

Toolholding System for any ER Collet System

By:
Rego-Fix’s latest versions of its secuRgrip anti-pullout toolholding system can be used in any ER collet system as well as applied in the company's milling chucks. 

Haimer Kennametal KM4X

Rigid Spindle Interface with Tool-Locking Technology

By: Edited by Stephanie Monsanty
Kennametal and Haimer have developed the KM4X spindle interface with Safe-Lock toolholder technology.


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