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:
“The great God absolute! The centre and circumference of all democracy! His omnipresence, our divine equality!”
—Herman Melville (1819–1891)
“Belief and love,—a believing love will relieve us of a vast load of care. O my brothers, God exists. There is a soul at the centre of nature, and over the will of every man, so that none of us can wrong the universe.”
—Ralph Waldo Emerson (1803–1882)
“Marriage and deathless friendship, both should be inviolable and sacred: two great creative passions, separate, apart, but complementary: the one pivotal, the other adventurous: the one, marriage, the centre of human life; and the other, the leap ahead.”
—D.H. (David Herbert)