Building an AI robot capable of running and jumping involves a staggering number of components. A rough estimate suggests that high-performance joint actuators alone number over 40, while the total component count for the entire machine often reaches the order of several thousand.

These parts are not merely assembled in a haphazard pile; rather, they are organized through a sophisticated "systems engineering" approach. It is most intuitive to visualize the structure as a "human-like" body:

Next, we will break down this diagram to examine the specific materials used for each part and the manufacturing processes involved.

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The Skeleton: Balancing Lightweight Design and Impact Resistance

The robot's skeleton serves as the structural foundation for the entire body, determining its load-bearing capacity and range of motion.

Mainstream Materials: Aluminum alloy currently plays the leading role, as it is significantly lighter than steel (with a density just one-third that of steel) while offering sufficient strength. Magnesium alloy is used for components where extreme weight reduction is prioritized—such as limbs that require frequent, rapid movement—since it is 30% lighter than aluminum. Meanwhile, high-strength titanium alloy is employed at joint connections that must withstand intense impact.

Manufacturing Processes:

Die Casting: This is a process in which molten or semi-solid metal is injected into a mold under high pressure for rapid forming. For instance, CITIC Dicastal employs a vacuum high-pressure die-casting process to manufacture robotic leg skeletons; this method offers high efficiency and low costs, making it suitable for mass production.

CNC Precision Machining: Critical structural components with complex geometries and stringent precision requirements—such as the shoulder joints and dexterous hands Honpe Prototyping could supply—require a combination of precision aluminum alloy die casting and CNC (Computer Numerical Control) precision machining. CNC machine tools can "carve" finished products from solid metal blanks with micron-level precision, although material utilization rates are relatively low.

Joints (Actuators): The Most Expensive and Precise "Muscles"

Joints serve as the power source for robots and represent their most costly component. A typical joint can be viewed as a precision "servo system" comprising a motor, a speed reducer, sensors, and a drive unit.

Analysis of Core Components:

Motor: Serving as the power source, the mainstream choice today is the permanent magnet synchronous motor. These motors are compact and highly efficient but rely on neodymium-iron-boron (NdFeB) permanent magnet materials—derived from rare earths—which entail significant costs. Inside the motor, countless layers of wafer-thin silicon steel sheets (only 0.1–0.3 mm thick) are stacked to form the stator and rotor, creating the core mechanism for electromagnetic energy conversion.

Speed Reducer: Known as the "force amplifier" of the joint, it converts the motor's high rotational speed into immense torque.

Harmonic Reducer: Offers high precision and a compact footprint; commonly used in light-load joints such as wrists and fingers.

RV Reducer: Features high rigidity and strong impact resistance; used in load-bearing joints like hips and knees.

Planetary Reducer: Lower in cost; frequently used in hand joints.

Manufacturing Challenges:

Speed reducers represent the most difficult aspect of manufacturing. Take the harmonic reducer, for instance: its core component—the flexspline—is a thin-walled, cup-shaped part with a wall thickness of only about 1 millimeter. Its machining precision must meet ISO Grade 5 gear standards. Because it is highly prone to deformation after heat treatment, the process demands exceptional tooling and technique—a classic example of "carving a work of art out of steel."

Skin and Shell: From "Protective Casing" to "Sensing Layer"

This aspect directly relates to how the robot interacts with its external environment.

Shell Materials: Beyond the metal framework, the robot's exposed "skin" is typically made of engineering plastics—such as ABS or PC/ABS. These materials are easy to mold, warm to the touch, and cost-effective, helping to give the robot a friendlier appearance.

Emerging Technology: Electronic Skin:

To endow robots with a sense of touch, scientists are developing "electronic skin." Essentially a type of flexible sensor, it utilizes a base material—commonly silicone rubber or polydimethylsiloxane (PDMS)—that allows it to stretch and bend just like real skin.

Sensitive materials capable of detecting pressure, temperature, and even humidity (such as carbon nanotubes or graphene) are integrated onto this flexible substrate, enabling the robot to perceive sensations as subtle as the weight of a falling leaf or a gentle handshake.

Table of Robot Core Components, Materials, and Processes

This overview illustrates that building a robot is no simple task. It represents not only the pinnacle of electronics and algorithms but also the culmination of collaboration between materials science and precision manufacturing within modern industry. Whether it involves "carving" a reducer gear with precision finer than a human hair or "weaving" a flexible skin capable of sensing the weight of any object, these represent the technological frontiers that the industry is currently striving to conquer.

Honpe Prototyping provides CNC, Vacuum casting, Sheet Metal, 3D printing all kinds of robot component processing method in multiple requested mateial like PMMA, ABS, PC, Aluminum alloy, Stainless steel, steel, Brass etc. Honpe has manufactured robot prototypes, done low volume production with high end CMF and precision assembly for lots of world top AI humanoid robotics brand adhering to a policy of speed and quality, with fast turnaround, guaranteed quality, and strict confidentiality.

What parts does your robot have? What kind of material and processing method would you like?

Contact Honpe engineering team to discuss your robot core components and material, processing methood.