Zofunikira za zida za helical:
1. Pamene meshing magiya awiri akunja, kasinthasintha kumachitika mosiyana, pamene meshing ndi zida zamkatindi zida zakunja kuzungulira kumachitika mbali imodzi.
2. Chisamaliro chiyenera kutengedwa ndi chiwerengero cha mano pa giya iliyonse pamene mukulumikiza giya yaikulu (yamkati) yokhala ndi zida zazing'ono (zakunja), popeza mitundu itatu yosokoneza ikhoza kuchitika.
3. Kawirikawiri zida zamkati zimayendetsedwa ndi zida zazing'ono zakunja
4. Amalola makina opangidwa ndi makina
Kugwiritsa Ntchito Zida Zamkati:mapulaneti oyendetsa mapulaneti ochepetsera kwambiri, zokopa etc.