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.



Göltenbodt toolholders

Presettable Toolholders Enable Quick Tool Changes

By: Edited by Stephanie Monsanty
Available from Schwanog, Göltenbodt’s next-generation line of toolholders is designed for Tornos MultiSwiss 6X4 and Star Swiss-type automatic lathes.

Expanded Anti-Pullout System Enables Secure Titanium Milling with ER Collet Systems

By: Mark Albert
Because of the extreme forces involved in machining titanium and other hard metals, it is necessary to take precautions to avoid pullout—the tendency for a cutting tool such as an end mill to gradually loosen in its holder and possibly be twisted out entirely.

Rego-Fix Securgrip anti-pullout toolholding system

Toolholding System Works with Any ER Collet System

By: Edited by Stephanie Monsanty
Rego-Fix offers new versions of its Securgrip anti-pullout toolholding system, designed for use in virtually any ER collet system as well as with Rego-Fix milling chucks.

Rego-Fix Expands reCool System for Swiss Automatics

By:
Rego-Fix has expanded its retrofit reCool system to include a version engineered to facilitate coolant-through operation on Swiss automatic machine tools.

Weldon-Flat Tools in a Precision Toolholder

By: Peter Zelinski
This system uses the standard Weldon flat so that end mills do not have to be modified for locking in place when a precision toolholder takes high-force cuts.


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