Technical Information About Helical Gears
HELICAL GEARS when used on parallel shafts are similar in usage to
spur gears. Where velocities exceed 1000 feet per minute, helical gears
provide a stronger, smoother running gear train.
This type of stock gearing is furnished in 45° helix angle. Materials
available are hardened steel, steel, stainless, aluminum, bronze, nylon
and non-metallic (phenolic).
End Thrust is developed by helical gears, but this may be overcome
through the use of thrust washers or other suitable types of thrust bearings.
When used on shafts at right angles these gears are commonly known
as “spiral gears”. In this application they have only point contact
between the teeth and are, therefore, not suitable for transmitting any
appreciable amount of horsepower.
PartPk also sells gear tooth measuring devices called GEAR
GAGES! Gear Gages reduce mistakes, save time and money when
identifying and ordering gears. These pitch templates are available in
nine sets to identify all the standard pitch sizes: Diametral Pitch “DP”,
Circular Pitch “CP”, External Involute Splines, Metric Module “MOD”,
Stub Tooth, Fine Pitches, Coarse Pitches and Unusual Pitches. Refer
to the section on GEAR GAGES for catalog numbers when ordering.
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