what is rho in bevel gear tooth dimension?

i want to design gear shaft... but i have problem in design tooth cause of its dimension.... i can't understand... plz help me..

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rho or ρ (greek) is "radius of curvature of tooth profile".
on this link you will find all information about gear wheels:
http://www.khkgears.co.jp/de/gear_technology/pdf/gear_guide1.pdf

 
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