Centre
A center punch is used to mark the centre of a point. It is usually used to mark the centre of a hole when drilling holes. A drill bit has the tendency to "wander" if it does not start in a recess. A centre punch forms a large enough dimple to "guide" the tip of the drill bit. When drilling larger holes, and the web of the drill is wider than the indentation produced by a centre punch, the drilling of a pilot hole is usually needed.
An automatic centre punch operates without the need for a hammer.
Read more about this topic: Punch (tool)
Famous quotes containing the word centre:
“A daze had come over his mind, he had another centre of consciousness. In his breast, or in his bowels, somewhere in his body, there had started another activity.”
—D.H. (David Herbert)
“The bogholes might be Atlantic seepage.
The wet centre is bottomless.”
—Seamus Heaney (b. 1939)
“Old politicians, like old actors, revive in the limelight. The vacancy which afflicts them in private momentarily lifts when, once more, they feel the eyes of an audience upon them. Their old passion for holding the centre of the stage guides their uncertain footsteps to where the footlights shine, and summons up a wintry smile when the curtain rises.”
—Malcolm Muggeridge (1903–1990)