Chowumitsira ndi chipangizo chomakina chomwe chimagwiritsa ntchito kutentha kuti chisungunuke ndikuchotsa chinyezi (nthawi zambiri madzi kapena zinthu zina zamadzimadzi zosasunthika) kuchokera kuzinthu, potero zimapeza chinthu cholimba chokhala ndi chinyezi chodziwika. Ndi mtundu wa zida zamakina zomwe zimagwiritsidwa ntchito pokwaniritsa kuyanika kwazinthu.
Zowumitsira zamakono poyamba zinkagwiritsa ntchito batch-operation fixed-zoumitsira pabedi. Kugwiritsiridwa ntchito kwa zowumitsira mumsewu chapakati pa zaka za m'ma 1800 kudawonetsa kukula kwa zowumitsa kuchokera pamagulu mpaka kugwira ntchito mosalekeza. Zogulitsa zambiri zamafakitale zimafunikira kuyanika panthawi yopangira, ndipo zidazo zimafunikira chinyontho chapadera pokonza, kupanga, kapena granulation. Zowumitsa zimatha kugawidwa molingana ndi mawonekedwe osiyanasiyana monga momwe amagwirira ntchito, kuthamanga kwa ntchito, njira yotenthetsera, kuyenda kwa zinthu zonyowa, kapena kapangidwe kake.
