Where does carbon fiber help in robots and automation machines, and which form should I use?

Use carbon fiber on the parts that move fast or must not change size: end-of-arm tooling, gantry and linear-axis beams, robot links, pick-and-place arms and sensor or camera mounts. Lighter moving parts mean less inertia, so motors accelerate faster, settle sooner and run cooler. Unidirectional carbon laminates have about three times the specific stiffness of aluminum^[1]^[2], and carbon barely expands with heat.

~3×specific stiffness of UD carbon vs aluminum

~40%lighter than aluminum at the same volume

~6×more thermal expansion in aluminum

Robotics and automation factories are among the buyers of our tubes, sheets and profiles^[3].

Robot arm with carbon fiber links and gripper — Robot links and end-of-arm tooling are the first parts worth making lighter.

Which parts benefit, and which form fits?

Machine part	Why carbon helps	Best form
End-of-arm tooling (grippers, vacuum frames)	lighter payload, faster moves, smaller robot	square or round tubes, CNC-cut sheet plates
Gantry and linear-axis beams	less moving mass, less overshoot	large square or rectangular roll-wrapped tubes
Pick-and-place and delta arms	very fast cycles	round tubes, pultruded rods
Sensor, camera and measuring mounts	stays the same size when temperature changes	sheet plates, square tubes
Guards and covers	light and stiff panels	thin sheet
Stiffeners on existing parts	adds stiffness with little weight	pultruded strips bonded on

How much lighter and stiffer?

Material	Modulus (GPa)	Density (g/cm³)	Specific stiffness
Aluminum	68.9^[1]	2.7^[1]	25.5
Woven T300 carbon laminate	55^[2]	about 1.6^[1]	34
Unidirectional T300 carbon laminate	120^[2]	about 1.6^[1]	75

Specific stiffness (modulus ÷ density)

Aluminum25.5

Woven carbon34

Unidirectional carbon75

For beams, ask for tubes with most plies running along the length. That is where the stiffness gain over aluminum is largest. See square or round tube for choosing the section.

Square carbon fiber tubes for machine frames — Square tubes for gantry beams and tooling frames.

Carbon fiber sheet being machined on a CNC router — Sheet plates CNC-cut to the gripper or mount design.

Design points for machine parts

Joints decide the result. Bond aluminum or steel end fittings into tubes, with an isolating layer to stop galvanic corrosion. See joining carbon fiber to metal.
Use inserts for bolts in thin walls and plates so clamp loads do not crush the laminate.
Watch the temperature near motors and heaters. Epoxy resins soften near their Tg of 100–130 °C^[4].
Static. Carbon conducts, which helps where static build-up is a problem, but keep it away from live electrical parts.

TipStart with the part farthest from the motor: the end-of-arm tool. Weight saved there pays back most, because every joint and motor before it carries it.

What to send

The part drawing (STEP for tubes with end fittings, DXF for plates), the material it replaces, the moving mass you want to reach and the quantity. We can cut, drill and CNC-machine tubes and sheets to the drawing^[5]. Use the quote form.