A helical rack has a planar pitch surface and teeth that are oblique to the direction of motion.
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Famous quotes containing the word rack:
“The cloud-capped towers, the gorgeous palaces,
The solemn temples, the great globe itself,
Yea, all which it inherit, shall dissolve,
And, like this insubstantial pageant faded,
Leave not a rack behind.”
—William Shakespeare (1564–1616)