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 for Tornos MultiSwiss 6×4 and Star Swiss-type automatic lathes

Expanded Line of Pre-Settable, Quick-Change Tooling Systems

By: Katie Cattell
Göltenbodt, represented in the United States by Schwanog, introduces its new generation of toolholders for Tornos MultiSwiss 6×4 and Star Swiss-type automatic lathes.

Schwanog insertable form tool system

Insertable Form Tool System

By: Katie Cattell
Schwanog’s insertable form tool systems are designed to efficiently manufacture precision parts for the medical, automotive and aerospace industries.

Ibag North America Micro Collet

Collets Designed for Use with High-Speed Spindles

By: Hannah Coombs
Ibag North America displays its Ibag Micro Collet for precision-part manufacturing that enables accuracies of 1-micron TIR at the collet nose and accommodates tool diameters ranging to 1/8".

Iscar Deca IQ Thread

Tangentially-Clamped Threading Insert with 10 Cutting Corners

By: Katie Cattell
Iscar’s Deca IQ Thread is a round insert with five double-sided corners, providing 10 functional cutting edges. The line is designed to boost production, raise quality and reduce costs.

Somma Forte broaches

New Line of Broaches Extends Tool Life

By: Katie Cattell
Somma Tool, a manufacturer of offset rotary broaching tools and holders, offers its new line of Forte broaches.


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