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.



Synchroflex II.

Tap Holder Equipped with Internal Coolant

By: Edited by Julianne Mobilian
Tapmatic offers the Synchroflex II tap holder, includes a balanced, high-pressure internal coolant system with maximum flow rates for increased tap life and thread quality, especially in deep blind holes.

Milling Chuck Assembly Maximizes Tool Accuracy

By: Edited by Julianne Mobilian
Bilz Tool will introduce the Diebold UltraGrip milling chuck system, said to combine the highest possible cutting tool run-out (TIR) with maximum clamping force.

Multidec Lube Coolant Clamp Reduces Setup Time

By: Lori Beckman (editor)
GenSwiss’ Multidec-Lube coolant-through toolholder clamp for CNC Swiss machines permits optimum coolant jet positioning, eliminates time bending and aiming coolant lines, reduces overall setup time and prevents stringy chips collecting on cutting tools, the company says.

Design-A-Groove tooling.

Specialized Tooling Configurations Available

By: Edited by Julianne Mobilian
ThinBit, manufactured by Kaiser Tool Company, features Design-A-Groove tooling that can be modified according to a customer’s specific application requirements.

ReCool Coolant-through System.

Through-Coolant System Retrofits Live Tooling

By: Edited by Julianne Mobilian
Rego-Fix will showcase its retrofit ReCool through-coolant system, said to be a fast, cost-effective and low-maintenance means of adding the benefits of internal cooling to live tooling used in CNC turning operations.


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