ROBOT TYPES
Linear / Cartesian Robots
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In summary
Linear and cartesian robots — gantries moving on prismatic axes — trade articulated dexterity for a large, predictable rectangular work envelope, scaling to tens of meters with heavy payloads. Eurobots Marketplace lists used gantry products from Güdel, Bosch Rexroth, FANUC and KUKA KL linear-axis additions, typical for CNC pallet loading and long-conveyor palletizing.
About this category
Linear and cartesian robots — gantries and overhead manipulators that move on prismatic axes — trade the dexterity of articulated arms for a large, predictable rectangular work envelope. They scale to enormous workspaces (tens of meters), carry heavy payloads, and are the natural choice for CNC pallet loading, large-format machining and palletizing across long conveyor lines.
The used market for linear robots is fragmented: many are custom-engineered for a specific machine and end up scrapped rather than resold. The exceptions are standardized gantry products from Güdel, Bosch Rexroth, FANUC and KUKA's KL linear-axis additions to 6-axis arms.
Available robots
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Frequently asked questions
Linear gantry or 6-axis robot for large workspaces?
Above 3 m of working envelope, gantries usually win on cost, repeatability and structural rigidity. They also work well for top-down operations where vertical access is natural. A 6-axis arm on a linear rail (KUKA KL, FANUC J3) is the hybrid solution when you also need orientation flexibility.
Are used cartesian robots a good buy?
It depends on standardization. A modular gantry from Güdel or Bosch Rexroth with documented mechanics and standard servo drives is reasonable. A custom one-off cartesian from a defunct machine builder usually isn't — you'll struggle with spare parts and re-integration cost.
What payload can a gantry carry?
Anything from 5 kg pick-and-place gantries to 1,000+ kg foundry handling systems. The relevant questions are stroke length, repeatability (typically 0.05-0.2 mm), and whether the controller is compatible with modern PLCs.
How precise are cartesian robots?
Repeatability is excellent — 0.05-0.1 mm is typical for high-quality linear rails with ball-screw or rack-and-pinion drives. Absolute accuracy depends on calibration and thermal stability; for tight tolerances over long strokes, count on a 0.2-0.5 mm working accuracy.