1000-4000kg Payload Four Carriage 0.05mm Repeatability 7th Axis Robot Linear Track The RL series 7th axis robot linear track moves a floor mounted industrial robot along a machined steel rail, so one robot can serve several machines, fixtures or pallet positions arranged in a row. Four preloaded profile roller carriages run on hardened guideways, and the rail is built from 0.5 m modules, which means a 30m travel layout is assembled from standard parts instead of one custom