Course Number 71 Gears and Gearing - Helical Gears 4.5 hours of instruction  Format: Programmed Instruction Self-study Price: $18.50

Identification of helical gears, their dimensions and measurement procedures; helix angle, shaft angle, and the relationship between them; how to determine the "hand" of helical gears; diametrical pitch (DP), pitch diameter (PD), pressure angle and the use of formulas for DP and PD; selection of a desired helical gear from a stock gear catalog; differences between helical gears on parallel and right angle shafts; direction of rotation of helical gears on parallel shafts and on right angle shafts and how to determine direction of one gear if direction of the other is known on right angle shafts; idler helical gears; thrust of helical gears and how to determine direction of the thrust on parallel and right angle shafts; double helical (or herringbone) gears and how they are different from straight helical gears; and a review of major differences between helical and spur gears.
Prerequisites - Ability to perform simple arithmetic calculations and to read simple engineering drawings (Course Number 109). A basic understanding of spur gears (Course Number 26), gear ratios (Course Number 61), and gear installation (Course Number 66).

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Related Instruction:

Course Number 26 - Spur Gears

Course Number 61 - Gear Ratios

Course Number 66 - Gear Installation

Course Number 76 - Bevel Gears

Course Number 98 - Worms and Worm Gears