Ka jingkhein ia ki jingthew jong ka jingkieng kaba jylliew

Ka jingkhein ia ka step kaba spiral .

Sngewbha pyni ia ki jingthew ba donkam

H - Ka jingjrong jong ki step
D1 - O.D.
D2 - Ka jingheh ba shapoh
C - Ka jingkhein ia ki step
Z - Ka jingkhluit jong ka step
A - ka angle jong ka jingpynkylla ia ki step

ka jingshim jingmut

Ka jingjrong jong ki step ha ki jingkieng spiral kam dei ban duna ia ka 80 cm.
Ka jingheh jong ka step ha ka bynta ba pdeng ka dei ban long ym duna ia ka 20-25 cm, ha ka bynta kaba heh tam - ym palat ia ka 40 cm. Ka jingjrong jong ki step jong ka step spiral ka lah ban kham heh ban ia ka jingjrong ba la ai jingmut na ka bynta ki step iaid kjat. Ka jingjrong kaba thikna jong ki step na ka bynta ki step ba iaid ka long 16 cm, na ka bynta ki step ba kyllain - 18 cm.

Ha ka jaka ba step ka kjat, ka step jong ka step spiral ka dei ban long kumba 25-30 cm, harud ka tduh - ym duna ia ka 30-35 cm. Kane ka jingjylliew jong ka step kan long kaba suk bha.

Ki jingthew jong ki step jong ki step ba spiral.

h - ka jingjrong step
W1 - ka jingheh jong ka step ha ka bynta kaba heh
W2 - ka jingheh kaba thylli
α - ka angle jong ka jingshna dur