Kalkulasen eu steik mi spiral .
Kopwe pwarata ekkewe ukukun mi namwot .
H - Tekian ewe step
D1 - O.D.
D2 - Diameter non
C - Numpaan ekkewe step .
Z - Step tichik .
A - angochun rotasion
pisekin pwaarata
Ewe ttamen ekkewe step non ekkewe step mi spiral esapw kukkun seni 80 cm.
Ewe watten step non ewe kinikinin nefinen epwe ukukun 20-25 cm, non ewe kinikin mi watte - esap nap seni 40 cm.
Eli tekian ekkewe step lon eu steik mi spiral epwe lap seni ewe tekian mi mumuta fan iten ekkewe steik mi march.
Ewe ükükün tekian ekewe step fän iten ekewe step mi mars ina 16 cm, nge fän iten ekewe step mi spiral - 18 cm.
Non ewe neni ikewe ewe pechen a fetan ie, ewe step an ewe steik mi spiral epwe ukukun 25-30 cm, won ewe epek - epwe ukukun 30-35 cm.
Ei step epwe fokkun mecheres.
Ekkewe step mi fiti spiral.
h - step ttaman
W1 - watteen step at watteen kinikin .
W2 - step mi uren puun
α - kokkotun step angoch