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.



Quick-Change Receiver System Enables Precise Location

By: Edited by Stephanie Monsanty
Mitee-Bite Products offers a quick-change mechanical receiver system for rapid change-over and precise location of small fixture pallets.

Multi-Axis Workholding System Uses Three-Side Dovetail

By: Mark Albert
The Get-A-Grip pedestal fixture for five-axis workholding uses a triangular clamping geometry for the matching workpiece and clamping dovetails.

Samchully Workholding TR-320FF rotary table

Fifth-Axis Rotary Table Features High-Torque Motors

By: Edited by Stephanie Monsanty
Samchully Workholding’s TR-320FF heavy-duty fifth-axis rotary table uses high-torque motors for both the tilt and turn axes, enabling a 330-lb load capacity.

Vise within a Vise System Enables Economical Five-Axis Machining

By: Edited by Emily Probst
A unique vise-within-a-vise system using Kurt workholding enables Peterson Machining Inc. to cost effectively use five-axis manufacturing for complex parts.

Stallion Hybrid Eliminates Need to Remove Trunnion Table

By:
The Stallion Hybrid trunnions from TrunnionTable.com allow faceplates and chucks to be installed without removal of the trunnion table for faster part setups, increased productivity and higher quality parts, the company says.


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