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N1·D2=N2·D2 =>D1/D2=N2/N1
N1·Z1=N2·Z2 =>Z1/Z2=N1/N2
Nwheel=Nscrew · Zgrooves/Zwheel
N1·Z1=N2·Z2=>Z1/Z2 =N2/N2
N4/N1=Z1·Z3/Z2·Z4
N4/N1=D1·D3/D2·D4
F=R/2
F=R/2·N
F·d=R·r
