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.

Heimatec U-tec

Flexible Adapter System Available on Right-Angle Heads

By: Katie Cattell
Heimatec’s U-tec flexible adapter system is available on all right-angle heads in the company’s line, and models are available for most machine tool lines in the North American market, the company says.

Quick-Change Tool System Reduces Setup Time

By: Katie Cattell
Benz’s Solidfix modular tool-changing system is designed to enable quick tooling changes via adapters that hold a variety of tools.

Emuge SpeedSynchro

Toolholder for High-Production Tapping

By: Katie Cattell
Emuge’s SpeedSynchro toolholding solution features an integrated transmission of 1:4.412 for optimizing thread production on CNC machines with synchronous spindles.

Inside Haimer’s Expanded North American Headquarters

By: Derek Korn
The company’s shrink-fit, balancing and tooling technologies are on display in a new 25,000 square-foot facility.


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