mandrel

[man-druhl]
noun Machinery.
1.
a shaft or bar the end of which is inserted into a workpiece to hold it during machining.
2.
a spindle on which a circular saw or grinding wheel rotates.
3.
the driving spindle in the headstock of a lathe.
Also, mandril.


Origin:
1510–20; perhaps akin to French mandrin

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
mandrel or mandril (ˈmændrəl)
 
n
1.  a spindle on which a workpiece is supported during machining operations
2.  a shaft or arbor on which a machining tool is mounted
3.  the driving spindle in the headstock of a lathe
4.  (Brit) a miner's pick
 
[C16: perhaps related to French mandrin lathe]
 
mandril or mandril
 
n
 
[C16: perhaps related to French mandrin lathe]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

mandrel
"miner's pick," 1510s, of unknown origin. Also applied from 17c. to parts of a lathe or a circular saw.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

mandrel man·drel or man·dril (mān'drəl)
n.

  1. A shaft on which a working tool is mounted, as in a dental drill.

  2. See mandrin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

mandrel

cylinder, usually steel, used to support a partly machined workpiece while it is being finished, or as a core around which parts may be bent or other material forged or molded. As a support during machining, the mandrel is usually slightly tapered so that when firmly pressed into a previously machined hole, a strong frictional grip between the mandrel and the wall of the hole is effected. The mandrel is mounted on fixed centres that fit in tapered holes in the ends of the mandrel, and it is rotated by an attachment driven either continuously from a power source when cylindrical surfaces are being cut on the workpiece or intermittently by hand when longitudinal grooves are being cut. To accommodate a larger range of hole sizes, a hollow expanding mandrel, having longitudinal slots and capable of expansion by a tapered plug, can be used.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The pieces are held in the flame using a thin metal wire called a mandrel,
  which is carefully removed as the pieces cool.
Surface maps based on metrology techniques determine the rate the aperture mask
  moves across the mandrel face.
Each capsule is made by depositing beryllium on a smooth, perfectly spherical
  plastic mandrel.
The mandrel shall be pulled through the pipe by hand to ensure that maximum
  allowable deflections have not been exceeded.
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