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.



Manual Collet Fixture Enables Vertical, Horizontal Mounting

By: Edited by Stephanie Monsanty
Royal Products’ Quick-Grip (QG) manual collet fixtures are suitable for use with the company’s QG-42, 65 and 80 series collets.

Concentric Clamping for Ultimate Tool Performance

By: Lori Beckman (editor)
The Tendo product line shares many common features, including excellent vibration damping and improved surface quality, according to manufacturer Schunk.

Parlec SimulFit toolholding system

Toolholding System Improves Tool Connection Rigidity

By: Edited by Stephanie Monsanty
Parlec’s SimulFit dual-contact taper toolholding system is available on ER collet chucks, shell mill holders, end mill holders and milling chucks.

Rego-Fix powRgrip Unit Built for Reliability

By: Lori Beckman (editor)
Rego-Fix has expanded its powRgrip line of toolholding systems with the PGU 9500 automatic clamping unit.

Heimatec coolant-through tooling

Coolant-Through Capability Added to Tooling

By: Edited by Stephanie Monsanty
Heimatec now offers coolant-through technology on all its current products to enable faster, cleaner cutting on larger and deeper parts where chips and excess heat buildup can be problematic.


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