Calculations :
•Pitch Circle Diameter (PCD) = Module ´ No. of Teeth.
•Addendum = Module.
•Clearance = 0.25 ´ Module.
•Dedundum = Addendum + Clearance
•Circular Pitch = p ´ Module
•Tooth Thickness = Circular Pitch / 2
example :
Draw the profile of a Spur Gear whose design details are
given as follows using Unwin’s method.
•Pressure angle - 20º
•Module - 8 mm
•Number of teeth - 25
•Pitch Circle Diameter (PCD) = Module ´ No. of Teeth.
= 8 ´ 25
= 200mm
•Addendum = Module = 8 mm.
•Clearance = 0.25 ´ Module = 0.25 ´ 8 = 2 mm
•Dedundum = Addendum + Clearance = 8 + 2 = 10mm
•Circular Pitch = p ´ Module
= p ´ 8 = 25.13mm.
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