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.



Samchully Workholding MCA chuck

Three-Jaw Pneumatic Chuck Holds Round Workpieces

By: Edited by Stephanie Monsanty
Samchully Workholding’s MCA pneumatic chuck is a three-jaw stationary chuck designed to hold round workpieces in a machining center or mounted on a tombstone.

Northfield Precision Instrument internal-grip collet chuck

Collet Chuck Features Removable Part Stop

By: Edited by Stephanie Monsanty
Northfield Precision Instrument Corp. offers an internal-grip collet chuck originally designed to help a customer clamp the internal diameter of valve balls.

Harding Workholding collets and guide bushings

Collets and Guide Bushings for Swiss Workholding

By: Edited by Stephanie Monsanty
Hardinge Workholding has expanded its range of products for workholding in Swiss-type machining with additional collets and guide bushings.

Got Glue (And UV Light)?

By: Derek Korn
Here’s an effective albeit atypical way to fixture parts such as thin-wall castings that are prone to flexing when conventional mechanical clamps are used.

Shop Finds Fixturing Solution for Flexing Parts

By: Derek Korn
Precision Grinding and Manufacturing uses an atypical means to fixture thin parts that are prone to flexing when conventional workholding clamps are used: adhesive cured by UV light.


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