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.



U S Shop Tools soft chuck jaws

Soft Chuck Jaws Maximize Concentricity

By:
U S Shop Tools offers soft chuck jaws in various heights, lengths and hole-to-front dimensions for use with most manual and CNC lathe chucks.

The Various Styles of Mechanical Indexers

By: Derek Korn
Mechanical rotary indexers like these can be installed on a machine quickly and take up less table real estate of motorized indexers.

Range of Swiss Collets Available

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Hardinge, in conjunction with Tsugami, offers a range of collets for Swiss-style CNC and cam-operated lathes.

Clamping System Reduces Machining Time and Setup

By: Lori Beckman (editor)
The staff at Rodriquez GmbH in Eschweiler, Luxembourg (Germany), has been relying on a Hermle C40 milling machine equipped with the Hainbuch Quadrok Plus clamping system for the manufacturing of linear technology components.

SMW Autoblok SRG steady rest

Steady Rest Supports Shafts for Grinding

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SMW Autoblok’s SRG steady rest is designed to support shaft-type workpieces on grinding machines.


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