Nidaamka waraabka ee bartamaha:sidoo kale loo yaqaan mashiinka waraabka wareegsan, mashiinka waraabka saacadda u jeeda, mashiinka waraabka ee bartamaha loo yaqaan 'pivot centre', wareegga waraabka, iwm.
Waa rusheeye weyn oo taageera tuubada oo leh madaxa rusheeyaha oo ku yaal biriiga kaas oo si toos ah u socon kara oo ku wareegi kara bartamaha barta iyadoo la adeegsanayo nidaamka biyaha inta lagu buufinayo.