Left Hand and Right Hand Worm
A right hand helical gear or right hand worm is one in which the teeth twist clockwise as they recede from an observer looking along the axis. The designations, right hand and left hand, are the same as in the long established practice for screw threads, both external and internal. Two external helical gears operating on parallel axes must be of opposite hand. An internal helical gear and its pinion must be of the same hand.
A left hand helical gear or left hand worm is one in which the teeth twist counterclockwise as they recede from an observer looking along the axis.
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Famous quotes containing the words left, hand and/or worm:
“One must apply one’s reason to everything here, learning to obey, to shut up, to help, to be good, to give in, and I don’t know what else. I’m afraid I shall use up all my brains too quickly, and I haven’t got so very many. Then I shall not have any left for when the war is over.”
—Anne Frank (1929–1945)
“The five kings count the dead but do not soften
The crusted wound nor stroke the brow;
A hand rules pity as a hand rules heaven;
Hands have no tears to flow.”
—Dylan Thomas (1914–1953)
“The worm of conscience still begnaw thy soul!”
—William Shakespeare (1564–1616)