[JPVM]

Algo como esto :

http://www.4lo.com/calc/gearmetric.htm

http://www.ring-pinion.com/calculators/calctireh.html

http://www.ring-pinion.com/calculators/calcrpm.html

http://www.ring-pinion.com/calculators/calcgr.html

http://www.4lo.com/calc/geartable.htm