Inqubo yokukhiqiza:isikhunta ebandayo ukwakha. Izinzuzo:Ikhiqizwe ubuchwepheshe bokubumba obubandayo, qinisekisa kusuka ezintweni ezibonakalayo zezinto ezingavuthiwe. iqinisekisa ngempumelelo ububanzi bayo bangaphakathi, iphimbo, indawo ye-helical ku-prime line perpendicular angle.
