View source for Centre Punch

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=====Description=====

[https://en.wikipedia.org/wiki/Punch_(tool)#Centre '''Centre Punches'''] are ground to a strong point with an included angle of 90 degrees by holding them '''[[Tangents and Normals|Tangentially]]''' to a '''[[Tool Grinder]]''' and rotating them. This tends to create grinding marks which run along the point and strengthen it rather than weakening it by going across ''(i.e. in a similar manner to a '''[[Scriber]]''')''.


=====Features and Uses=====

To stop a drill bit skidding about a metal surface, these are used to make a small indentation to locate the drill centre.
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<span style="color: green">'''Note:'''
Hold the punch to an angle to position on centre then raise to the vertical and strike it sharply with a '''[[:Category:Hammers|hammer]]''' - but only once - striking several times may cause the punch to bounce around.  
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{{Centre Punch Buyers Guide}}

[[Category:Punches]]