Hi friends, I want to design a spur gear. inputs are tangential force on gear teeth is 20N. plz guide if any one know how to design a spur gear.

I'm no gear expert, but I did a quick google, and found this: http://wwweng.uwyo.edu/commend/Sgdc/ I think I googled "spur gear design calculator"

thank u very much,but i want to calculate theoritically. i hope any one can help me to solve this problem.

agreed that book is excellent i also have in front of me Machine Design theory and practise by Aaron D. Deutschman, Walter J. Michels and Charles E. Wilson another useful book

for anyone who still needs this information: The main factors affecting the strength of spur gear is a module or diametral pitch (DP). Selection of module is determined by power requirement and speed of pinion gear. In this case, if tangential force in 20N, so Power requirement = F (Tangential force) x V (velocity m/s). ==> you must be know gear speed (rpm) for next calculation read more ==> http://www.mymachineinfo.com/2015/05/calculation-of-spur-gear.html thanks.