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.



A Hollow-Access Unit for Wire EDM

By: Mark Albert
By simultaneously rotating and tilting the workpiece, this rotary tilt/turn hollow-access device from Hirschmann enables the EDM wire to cut complex openings that may have different paths at the top and bottom of the opening.

What to Know about Torque Motors

By: Mark Albert
Torque motors are commonly used in indexing tables on machine tools. This succinct article helps you evaluate this and other applications in which power transmission for rotation calls for the advantages of a torque motor.

Gressel Gripos machine vises

Modular Vises Clamp with Tension

By: Edited by Stephanie Monsanty
Available from Exsys Tool, Gressel’s Gripos machine vises clamp by tension rather than compression to eliminate baseplate deflection and promote high accuracy.

TMX Workholding 71

Custom Chucks Designed to User Requirements

By: Edited by Stephanie Monsanty
TMX Workholding offers large custom chucks in addition to its standard workholding products that include manual, collet and power chucks.

Workholding Pallet Solutions Include Four-Pin Pallet

By: Lori Beckman (editor)
Jergens Inc. range of pallet solutions has been expanded to include two more styles, a four-pin pallet and a manual version of the company’s ZPS (Zero Point System).


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