Change Gears are primarily used in machinery where gear ratios are
frequently changed. Every consecutive number of teeth are available
from 20 teeth to 120 teeth (up to 200 teeth in some pitches). Change
Gears are flat plain style spur gears without hubs.
A "gear-train" or series of change gears may operate together in trains
of idler gears mounted on compound double keyway bushings.
Change Gears are referred to as the "G" series part numbers in the
range of 20 teeth and up, each gear having the same bore, face and
double keyway dimensions for a given pitch. Two gears may be
assembled on a single change gear bushing to form a single compound
unit.
"A" series Change Gears are furnished with smaller minimum plain
bores which can be re-bored to suit varying shaft sizes. "A" series gears
start at 10 teeth.
Change Gears are interchangeable with other types of Spur Gears
including Internal Gears, Stem Pinions and Gear Rack.
RUSH GEARS also sells 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.