Gear
GEAR
Gear is
disc with several teeth on their circumference. Varying torque/Speed, direction of movement is
the function of gear and based on design and construction, its applications
differs.
DESIGN OF GEAR
Assumptions
Number of Teeth (N) = 25
Module (Standard)(m) = 10
Pressure
angle = 20°
CALCULATIONS
Addendum = 10
Dedendum = 1.125
× 10 = 11.25 mm
Pitch Circle
Diameter (d) = m × N = 10 × 25 = 250 mm
Outer
diameter (OD) = PCD +
(2 × addendum) = 250 + (2 ×10) = 270 mm
Root or Inside
diameter (Id) = PCD - (2 × dedendum) =250 – (2×11.25)= 227.5 mm
Circular
pitch =
(π × PCD)/N = (3.14×250)/25 = 31.4
Tooth
thickness = Circular pitch/2 = 15.7 mm
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