What do a.m. and p.m. stand for?

helical gear

a cylindrical gear wheel whose teeth follow the pitch surface in a helical manner.
Origin of helical gear
1885-90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for helical gear
  • The drum shall be driven by a helical gear reducer with external spur drum gear enclosed in an oil-tight housing.
  • The drive unit shall be a helical gear reducer with hardened alloy steel gears accurately cut to shape.
British Dictionary definitions for helical gear

helical gear

a cylindrical gearwheel having the tooth form generated on a helical path about the axis of the wheel
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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