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.
Read more about this topic: Worm Drive
Famous quotes containing the words left, hand and/or worm:
“She left the web, she left the loom,
She made three paces through the room,
She saw the water-lily bloom,
She saw the helmet and the plume,
She looked down to Camelot.
Out flew the web and floated wide;
The mirror cracked from side to side;
“The curse is come upon me,” cried
The Lady of Shalott.”
—Alfred Tennyson (1809–1892)
“I gave a speech in Omaha. After the speech I went to a reception elsewhere in town. A sweet old lady came up to me, put her gloved hand in mine, and said, “I hear you spoke here tonight.” “Oh, it was nothing,” I replied modestly. “Yes,” the little old lady nodded, “that’s what I heard.””
—Gerald R. Ford (b. 1913)
“For she has made me the laily worm
That lies at the fit o’ the tree,
An’ my sister Masery she’s made
The machrel of the sea.”
—Unknown. The Laily Worm and the Machrel of the Sea (l. 5–8)