Makhalidwe azida za helical:
1. Pamene meshing magiya awiri akunja, kuzungulira kumachitika mosiyana, pamene meshing ger mkati ndi kunja zida kuzungulira kumachitika mbali yomweyo.
2. Chisamaliro chiyenera kutengedwa ponena za chiwerengero cha mano pa gear iliyonse pamene mukugwedeza zida zazikulu zamkati ndi zida zazing'ono zakunja, popeza mitundu itatu ya kusokoneza ikhoza kuchitika.
3. Kawirikawiri zida zamkati zimayendetsedwa ndi zida zazing'ono zakunja
4. Amalola makina opangidwa ndi makina
Kugwiritsa Ntchito Zida Zamkati:mapulaneti oyendetsa magiya otsika kwambiri, mabokosi a gearbox etc.