Muna da layin samarwa guda uku don kayan ciki na ciki kuma suna kiran gears na zobe kamar zoben zobe da gears na zobe, galibi injin zobe za a yi ta injin ɗin mu don saduwa da daidaiton ISO8-9, idan broaching tare da niƙa wanda zai iya saduwa da daidaiton ISO5-6. , duk da haka helical zobe gears za a yi ta mu ikon skiving inji, wanda zai iya saduwa da ISO5-6 daidaito da kyau, wanda ya kasance mafi na yau da kullum ga kananan helical zobe gears.