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 toddling little girl is a centre of common feeling which makes the most dissimilar people understand each other.”
—George Eliot [Mary Ann (or Marian)
“Here in the centre stands the glass. Light
Is the lion that comes down to drink. There
And in that state, the glass is a pool.
Ruddy are his eyes and ruddy are his claws
When light comes down to wet his frothy jaws”
—Wallace Stevens (1879–1955)
“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)