Long taim bilong wok proses bilong masin bilong tromoi dai-kasting, prekursor bilong feil i kamap gen. Opereta i mas kamapim bikpela mak bilong stretim, lukluk isi, skelim ples bilong feil na posibol as bilong en, na painimaut wanpela rot bilong lukautim gut, na painimaut wanpela rot bilong lukautim wok i ken kamap, na makim wanpela rot bilong lukautim ol samting i ken kamap bihain: Opereta i mas tingim olsem masin i mas dai long masin o wanpela hot rum i dai long ples bilong em, olsem em i wanpela masin bilong tromoi ol samting i dai, o wanpela hot rum i save dai long ples bilong em, olsem em i wanpela masin bilong wokim ol kol rum o wanpela hot rum i stap aninit long en, olsem em i wanpela masin bilong wokim ol samting bilong kol o wanpela hot rum i stap aninit:
1) Long lukluk, harim, na testim, painimaut ol mak na ples bilong feil.
2) Skelim as bilong feil.
3) Sekim ol rekot operesen rekot na ol folt fail.
4) Painimaut ol rot bilong prosesim na ol step bilong wok.
5) mentenens bilong han.
