Workholding

Workholding refers to any device that is used to a secure a workpiece against the forces of machining. The most basic workholding device is a simple clamp, 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. In most machining applications, workholding also locates the part. On a machining center, for example, a vise or fixture may also provide the precise position and orientation where the machining program expects to find the workpiece.

Self centering vise is a cost effective and universal workholding method for five sided machining.
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A five-axis table tilts to provide spindle access to bores on a part held in a custom workholding fixture.
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The Fixture Niche

Oddly shaped parts that require custom fixtures are a particular specialty for this CNC machine shop. Here are a few principles it follows for effective fixture design. 

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News of Note: October 2018

The NTMA appoints a new president, Röhm acquires Master WorkHolding, Renishaw opens new demo center and more industry news. 
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Power Chuck Reduces Setup Times

Röhm Products of America’s Duro-A RC power chuck reduces setup times because of its jaw-change system that is said to enable the jaws to be adjusted, reversed or swapped in 50 seconds.



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