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)
“Him, the vindictive rod of angry justice
Sent, quick and howling, to the centre headlong;
I, fed with judgements,in a fleshy tomb, am
Buried above ground.”
—William Cowper (1731–1800)