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.



Carr Lane ID clamps

ID Clamps Offer Precision Clamping with No Interference

By: Edited by Stephanie Monsanty
Self-centering ID clamps from Carr Lane Manufacturing simultaneously locate and clamp from the inside of an existing hole or slot in a workpiece, leaving the entire outer surface clear for machining.

Rohm Products of America LVE chuck system

Chucks Enable Efficient Machining of Pipes

By: Edited by Stephanie Monsanty
Designed specifically for the oil and gas industry, Röhm Products of America’s LVE chuck system enables manufacturers to quickly and efficiently process long, large pipes as well as associated pipe couplings and connectors.

Samchully Workholding PAC air chuck

Air Chucks Offer Extended Stroke

By: Edited by Stephanie Monsanty
Samchully Workholding’s PAC series of extended-stroke Mega Bore air chucks are designed for pipe and tubular applications.

Subspindle Workholding Options

By: Richard Lewis
The advent of subspindle turning operations has impacted throughput for many shops. Understanding workholding options available for backworking can help a shop make better decisions when specifying how to hold parts for op. 20.

Video: Automation Inside the Workzone

By: Peter Zelinski
What is automation? Not just a robot. Technology for holding, moving and measuring the part inside the machine can also achieve considerable time and labor savings.


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