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.



Lathe Chuck Shields Protect Operators

By:
Danray Products offers 52" and 62" steel lathe chuck shields for lathes or similar machines.

Clamping System Speeds Workpiece, Fixture Swap

By:
BIG Kaiser's modular Unilock zero-point clamping system is available in a kit designed for all Haas 160-mm platter rotary tables.

Pratt Burnerd.

Combination Chuck Enables Off-Machine Presetting

By: Edited by Jedd Cole
The Gripfast Combination Power Chuck from Pratt Burnerd International, a division of 600 UK, provides lathes with a chuck, collet chuck and mandrel chuck in a single unit, available in sizes ranging from 165 to 800 mm.

Collet Chuck Essentials

By: Chris Felix
“Understanding CNC Collet Chucks” has been one of the most read articles in our archives during the past several years and continues to get substantial traffic today.

Precision Workholding Offers Multiple Advantages

By: Chris Koepfer (editor)
As American manufacturing continues to transition from the mass production of conventional parts to the manufacture of complex, high-value components in relatively small lot sizes, precision workholding has assumed increased importance


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