isilayidi esinomgca sinokwahlulwa sibe ziindidi ezintathu: isikhokelo somgca we-roller, isikhokelo somgca we-cylindrical kunye nebhola yesikhokelo somgca, ezisetyenziselwa ukuxhasa kunye nokukhokela iindawo ezihambayo kunye nokwenza i-reciprocating linear motion ngokwesikhokelo esinikiweyo.Ngokweempawu zokukhuhlana, isikhokelo esishukumayo sinokwahlulwa sibe sisikhokelo sokutyibilika, isikhokelo sokukhuhlana, isikhokelo sokukhuhlana okulastiki, isikhokelo sokukhuhlana kwamanzi njalo njalo.