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:
“Turning and turning in the widening gyre
The falcon cannot hear the falconer;
Things fall apart; the centre cannot hold;
Mere anarchy is loosed upon the world,”
—William Butler Yeats (1865–1939)
“To make our idea of morality centre on forbidden acts is to defile the imagination and to introduce into our judgments of our fellow-men a secret element of gusto.”
—Robert Louis Stevenson (1850–1894)
“Freedom to think our own thoughts, freedom to utter them, freedom to live out the promptings of our inner life ultimated in this convention, was termed a monstrosity of the 19th century. What was it?—the legitimate out-birth of the eternal law of progress. This reformation underlies every other; it is the only healthful centre around which hope of humanity can revolve.”
—Harriot K. Hunt (1805–1875)