Divide the system into elements and functions
Start with a schematic of the robot or machine and list the parts for which composite is being considered. For each part, specify the function: transmitting force, holding geometry, protecting components from accidental contact, positioning a sensor, reducing moving mass, or forming a housing. The same word “carbon” does not transform these elements into one task.
The next layer of input data is supports, directions of forces, accelerations, cycles, vibrations, possible impacts, temperature, humidity and contact media. For a moving part, not only the mass of the part is important, but also its position relative to the axis: changing the distribution of mass can affect drive, control and braking.
Separately mark the areas of holes, clamps, glue-ins, threaded parts and cable passages. In practice, the suitability of a composite element is often determined by the joint rather than by the properties of the material away from the joint.
Which form solves which problem
| Form | Typical role in a project | What to ask before choosing |
|---|---|---|
| Carbon sheet | Plates, brackets, bases, panels | Contour, supports, holes, thickness, edge, orientation |
| Carbon tube | Beams, levers, cross members, housings | External and internal dimensions, length, bending, torsion, connection |
| Carbon rod | Rods, axles without internal channel, spacers | Diameter, free length, fastening, longitudinal and lateral load |
| Fabric or prepreg | Custom geometry shaping and local reinforcement | Layer map, binder, tooling, process, control |
The table sets the route for discussion, but does not replace calculation. For example, a tube is useful as a long element, but its behavior depends on the placement of the reinforcement, the wall, the length between supports and the method of transmitting force through the end.
If the part is already designed as flat, prefabricated sheet material and CNC machining can shorten the path to prototype. If a complex shell or integrated geometry is required, molding technology, tooling and repeatability are first evaluated.
Stiffness, weight and durability - different requirements
The phrase “needs to be lighter and stronger” is not enough. Specify what result limits the system: deflection at the operating point, natural frequency, mass of the moving link, stability of a long element, positioning accuracy or connection life. Optimizing one indicator may worsen another.
The composite is anisotropic: the direction of reinforcement affects the result. Therefore, it is impossible to transfer the passport property of the fiber directly to the finished part. The result is determined by the material architecture, matrix, technology, geometry, holes, edges and nodes.
For a beginning project, it is useful to form two or three comparable options and a single test criterion. The choice is then based on the function being measured rather than on the overall impression of the material.
Connections and contact areas
The bolt clamp, glue-in, split coupling, and combination assembly transfer load differently. Before release, parts specify contact area, tightening or fixing method, access for assembly and disassembly, mounting requirements, and acceptable surface damage.
The situation should be avoided when the entire geometry is selected in the middle of the element, and the end is trimmed and drilled without checking. A hole, a sharp internal corner or a short gluing zone can become the defining location of the structure.
Electrical, thermal and galvanic interactions are also considered at the level of a specific node and environment. The general article does not prescribe a universal insulation or adhesive: the decision is confirmed by materials, process and operating conditions.
From prototype to repeatable part
The first sample is checked not only for installation in the assembly. The file version, material, orientation, processing method, edge condition and installation sequence are recorded. A safe test is then carried out under conditions appropriate to the intended purpose of the mechanism.
If the result is unsatisfactory, change one or a limited number of variables and save the history. Simultaneous changes in thickness, contour, fastener and test mode do not allow us to understand the reason for improvement or failure.
Before the series, control dimensions, markings, surface criteria and a list of documents are agreed upon. The Technical Center helps prepare such a request, but does not confirm seriality or tolerances before assessing a specific project.
What to submit for engineering discussion
- purpose of the robot, mechanism and specific part;
- drawing, 3D model or dimensional sketch;
- supports, load directions, cycles and permissible movements;
- description of connections, holes, inserts and contact areas;
- conditions of operation, maintenance and repair;
- quantity, project stage and acceptance criteria.
If the load or permissible deflection is not yet known, indicate so. This will separate the material request from the design task and allow you to determine what data needs to be obtained before commercial calculation.
For a flat part, DXF and control PDF are additionally transmitted. The STEP model, base diagram and list of mating components are useful for assembly.
Frequently asked questions
Which carbon fiber should I choose for my robot?
First, the part function, geometry, supports, loads, connections, and inspection criteria are determined. After this, the delivery form and specific material are selected.
Does composite always reduce mass?
No. The result depends on the design, connections, rigidity requirements and technology; it is compared for the same function.
What to choose: sheet, tube or rod?
Sheet is suitable for flat geometry, tube is suitable for a long element with an internal channel, and rod is suitable for a solid element. The final choice depends on the load and nodes.
Can the holes be drilled after production?
The possibility and requirements for processing are determined by material, geometry and purpose. It is better to fix holes and bases in the source files in advance.
Do you need a prototype?
For a new geometry, connection, or operating mode, a proof sample reduces the risk of bringing an untested solution into production.
CORDTEX is designing a robotic assembly?
The article does not state this. The scope of engineering and production work is confirmed after receiving the input data.