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:
“In the centre of his cage
The pacing animal
Surveys the jungle cove
And slicks his slithering wiles
To turn the venereal awl
In the livid wound of love.”
—Allen Tate (1899–1979)
“Go anywhere in England where there are natural, wholesome, contented, and really nice English people; and what do you always find? That the stables are the real centre of the household.”
—George Bernard Shaw (1856–1950)
“To live and die amongst foreigners may seem less absurd than to live persecuted or tortured by one’s fellow countrymen.... But to emigrate is always to dismantle the centre of the world, and so to move into a lost, disoriented one of fragments.”
—John Berger (b. 1926)