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.



Schunk SVP-Mini and SVP-RM manually actuated clamping devices

Manually Actuated Clamping Devices Ease Tool Changes

By: Edited by Stephanie Monsanty
The SVP-Mini and SVP-RM manually actuated clamping devices from Schunk are run on factory-defined set pressure.

BIG Kaiser Toolholder Catalog Organized by Spindle Interface

By: Lori Beckman (editor)
BIG Kaiser Precision Tooling Inc. replaces more than a dozen individual catalogs with this comprehensive catalog of high precision toolholder systems from parent company BIG Daishowa.

Utilis Dual Port Coolant-Through Toolholders Use a Single Coolant Feed Line

By: Lori Beckman (editor)
GenSwiss’ Dual Port coolant-through toolholders use a single coolant feed line.

Tribos-RM High Performance Toolholder for Micromachining

By: Lori Beckman (editor)
Special consideration must be made for micromachining, which is why Schunk is offering the Tribos-RM precision toolholder as the best solution for micromachining, with the ISO interface.

Horn Toolholder with Internal Coolant and Indexable Inserts

By: Lori Beckman (editor)
The System 216 from Horn is designed for internal grooving in bore diameters from 20 mm (0.787”) and larger.


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