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.

Machine Tool Database

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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.



Pioneer SX25

Collet System Avoids Cutter Pull-Out in High-Feed Applications

By: Jedd Cole
Pioneer has developed a cost-effective collet system for high-feed applications in which cutters pull out from their holders.

Space Saver Toolholders Increase Machine Production

By: Lori Beckman
Space Saver VDI spindle units are toolholders designed to increase machine production capability by increasing tool capacity and reducing chip-to-chip or retooling time.

Koma Precision Alberti Linea P

Redesigned Angle Heads Adjust ±105 Degrees

By: Jedd Cole
Koma Precision introduces Alberti Linea P high-power, adjustable angle heads with a new design and improved capacity.

Carmex Mini Tools

Multifunction Tool Line Available in Inch Dimensions

By: Jedd Cole
Originally introduced in metric configurations, Carmex’s Mini Tools line is now available in standard inch dimensions.

Rego-Fix toolholder

Strict Tooling Policy Ensures Engraving Shop’s Quality

By: Emily Probst
True Mark Engraving Co. needed precise toolholders to improve the working life of its cutters. Rego-Fix fit the bill.


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