Tooling & Workholding

Workholding

Workholding refers to any device that is used to a secure a workpiece and hold it in place against the forces of machining. The most basic workholding device is a simple clamp that is screwed into place on a machining center’s table, but workholding can also involve complex fixtures that are custom-built for particular parts. Other common workholding devices include vises and chucks, as well as indexers or rotary tables that are able to change the part’s position while it is held, so the machine can reach various features of the part without the setup having to be changed. In most machining applications, workholding also locates the part. In turning, for example, a chuck not only holds the part securely but also holds it precisely on the centerline of the spindle. On a machining center, the vise or fixture that holds the part may also hold it in the precise position and orientation where the machining program expects to find it. For this reason, components such as locating pins and workstops that make it easy to place piece after piece in the same location are also common workholding components.

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Featured Zone Content

The Case for Custom Fixturing


Photos of custom fixtures illustrate the types of applications that call for non-standard workholding.

Small Engine Precision Fuels Fifth-Axis Production Workholding Concept


The challenge holding tight tolerances for its billet RC helicopter engine components drove this company to develop an innovative fifth-axis tombstone device to complete multiple parts on an HMC in one setup.

Get That Part off the Table


Vertical machining centers with simultaneous five-axis machining capability have become popular in recent years.

Incremental Automation


This machine tool supplier sees shops searching for just a little bit of unattended capacity. Many shops are closer to obtaining this extra capacity than they realize.



Kurt Dovelock line

Workholding Line Eliminates Need for Machined Jaws

By: Katie Cattell
Kurt will feature its expanded DoveLock five-axis workholding line which includes two new models.

Jergens Quick Locating System Fixture Plate

Fixture Plate Extends Machining Envelope

By: Katie Cattell
Jergens will demonstrate its new Quick Locating System (QLS) Fixture Plate, designed for use with the company’s Ball-Lock quick-change system.

Haas TRT70

Dual-Axis Rotary Table for Five-Axis Machining

By: Katie Cattell
The TRT70 dual-axis rotary table from Haas Automation delivers high speed and accurate positioning for 3+2 and full five-axis machining of small, complex parts.

Haas TRT70

Dual-Axis Rotary Table for Five-Axis Machining

By: Katie Cattell
The TRT70 dual-axis rotary table from Haas Automation delivers high speed and accurate positioning for 3+2 and full five-axis machining of small, complex parts.

Soft Blank Top Jaws with Easy Locating Features for Consistent Clamping

By: Lori Beckman
The features are designed to reduce setup times, aid concentric performance, provide better chuck balance and have a longer jaw life because of the increased jaw accuracies.


Self centering vise is a cost effective and universal workholding method for five sided machining.
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