(Using metric system)
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You need the module (Essentially the tooth size) and number of teeth.
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PCD = module * number of teeth
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Its is taken standard as 2*pitch circle diameter - 3**pitch circle diameter for cast teeth. 3 *pitch circle diameter - 4 *pitch circle diameter for cut teeth. Pitch circle diameter = PI*module regards, Pranav
circle diameter minus center of pitch cirlce raius
The diameter of a circle is twice its radius, or 2r.
The formula for the circumference of a circle is the same, whatever its diameter. Circumference = pi*diameter.
pi*diameter = circumference Rearrange the formula so as the diameter is the subject of the formula: diameter = circumference/pi diameter = 7/pi = 2.228169203