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centre punch

British  

noun

  1. a small steel tool with a conical tip used to punch a small indentation at the location of the centre of a hole to be drilled

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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He kept a toffee hammer and a centre punch in his car.

From The Guardian Apr. 24, 2016

Figure 201 represents a centre punch, giving an example, in which the flat sides gradually run out upon a circle, the edges forming curves, as at A, B, etc.

From Mechanical Drawing Self-Taught by Joshua Rose

The part b of the centre punch is tapered so as to obstruct the vision as little as possible, while it is made hexagon or octagon at the upper end to afford a better grip.

From Modern Machine-Shop Practice, Volumes I and II by Joshua Rose

Half an inch from one end make a mark with the centre punch; then measure off exactly the distance between the shutter spindles, and make a second punch mark.

From Things To Make by Archibald Williams

The point a of the centre punch shown in Fig.

From Modern Machine-Shop Practice, Volumes I and II by Joshua Rose

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