Ground Mounted 7th Axis Robot Linear Track (GBS-01-W Series) The GBS-01-W series is a ground mounted 7th axis robot linear track that turns a fixed industrial robot into a travelling one. Contractors specify this ground mounted 7th axis robot linear track when an existing arm must cover several welding stations without buying a second robot. The carriage rides on a machined guide rail with a hardened gear rack, driven by an AC servo motor through a 1:10 planetary reducer, and