Two different guiding principles
Cartesian gantries use combined linear axes for movement in a defined coordinate system. Additional tool axes can provide orientation. Parallel cable robots guide a platform through multiple driven cables. Trimed uses eight cables and six degrees of freedom for position and orientation. This is a kinematic distinction; it does not by itself establish payload, accuracy or cycle time.
Cartesian robot principles: Festo · Parallel cable robot principles: Fraunhofer IPA
Compare the usable workspace
Map the tool positions and orientations actually required. For a cable robot, geometric reach and permissible cable forces must be assessed together. Cables transmit tension, so the platform must remain guided in the intended states. Anchor positions, support structure, tool supplies and obstacles all matter. For a gantry, compare axis travel, guidance, structure and access. For neither system do external dimensions alone describe the usable process space.
Consider tooling and the full load case
Moving mass includes more than the workpiece and platform. Grippers, adapters, supplies and process components must be considered too. Describe the centre of gravity, pick-up points, acceleration phases and process forces. A lightweight tool platform can be an interesting starting point; subsequent dynamics depend on the complete system. For contact tasks such as assembly or processing, also record forces and moments during the operation.
Compare accuracy and costs against a defined task
Distinguish positioning accuracy, repeatability and completed process quality. A comparison needs matching workspace, load case, measurement conditions and targets. Likewise include tooling, protective measures, commissioning, maintenance and integration in the cost comparison. A price for one axis or drive is not a complete system comparison. Trimed handling performance and a specific quotation are determined from the application.
Which information supports selection?
| Input | Why it matters |
|---|---|
| Workspace and orientation | Defines required tool states and approach paths. |
| Workpiece, gripper and supplies | Supports assessment of mass, centre of gravity and supply routing. |
| Cycle and process forces | Describes the motion profile and loads throughout the cycle. |
| Acceptance criteria | Defines the accuracy and function to demonstrate. |
What has Trimed already documented?
The available film documents platform motion on the cable robot prototype. In-house handling trials with a workpiece and gripper, and printing trials, have not yet been published. The 500 × 500 × 500 mm reference volume and stated print accuracy up to 0.1 mm concern printer development and must not be presented as committed handling performance. A project enquiry should therefore separate the intended task from the evidence to be provided.