Urunigi muri rusange ni icyuma gihuza cyangwa impeta, ikoreshwa cyane muburyo bwo gukanika no gukurura.Ibintu bimeze nk'urunigi bikoreshwa mu guhagarika inzira z'umuhanda (nko ku bwinjiriro bw'imihanda, inzuzi cyangwa ibyambu), iminyururu ikoreshwa mu guhererekanya imashini.

1. Urunigi rurimo ibice bine: urunigi rwohereza;urunigi;gukurura urunigi;urunigi rwihariye.

2. Urukurikirane rw'ibihuza cyangwa imirongo ikozwe mubyuma: ibintu bimeze nk'urunigi bikoreshwa mukubuza inzira zumuhanda (nko kumuryango wumuhanda, uruzi cyangwa icyambu);urunigi rukoreshwa mugukwirakwiza imashini.

3. Iminyururu irashobora kugabanywamo iminyururu migufi-yuzuye;iminyururu ngufi-iminyururu;iminyururu igoramye iminyururu yohereza ibintu biremereye;iminyururu kumashini ya sima n'iminyururu;iminyururu ikomeye.

Imiterere yuruhererekane rugizwe nu ruhererekane rwimbere rwimbere.Igizwe nibice bitanu bito: isahani yimbere, isahani yinyuma, pin, amaboko na roller.Ubwiza bwurunigi biterwa na pin hamwe nintoki.

Mu guhererekanya ibikoresho byimashini, ibice bikunze gukoreshwa birimo pulleys, gear, ibikoresho byinyo, rack na pinion, hamwe nutubuto twa screw.Binyuze muri ibyo bice byohereza, imbaraga zamashanyarazi na moteri, cyangwa ihuriro hagati yimikorere yombi, byitwa guhuza.Urukurikirane rw'ibintu bikurikirana bigizwe no guhuza byitwa urunigi.

Urunigi rwohererezanya ubusanzwe rurimo ubwoko bubiri bwokwirakwiza: ubwoko bumwe nuburyo bwo kohereza hamwe nigipimo cyagenwe cyagenwe hamwe nicyerekezo cyogukwirakwiza, nkibikoresho byagenwe byagenwe, inyo ya turbine, nibindi byitwa uburyo bwo kohereza ibintu;ubundi bwoko bushingiye kubisabwa gutunganyirizwa Uburyo bwo kohereza bushobora guhindura igipimo cyogukwirakwiza nicyerekezo cyogukwirakwiza, nkuburyo bwo guhinduranya ibikoresho, uburyo bwo kohereza ibikoresho, nibindi byitwa uburyo bwo gusimbuza.