BlackCat Robotics
Demo Mode
Repair Intelligence
Platform catalogs, component anatomy, simulation environments, and certification tracks — all in one place.
Menlo Robotics · Reference Humanoid
Open-source humanoid designed for researchers and builders. Full BOM, assembly manual, and 3D-printable CAD files published. 25+2 DOF, 1.2 m tall, 35 kg — available as a DIY kit or self-sourced from the published BOM.
25+2
DOF
35 kg
Weight
~$16k
BOM Cost
Open-Source
What is physically inside a robot — and how each part fails. Every entry includes a “human bridge” — how to feel, see, or measure the failure before you ever open a diagnostic tool.
A typical humanoid uses 25-30 actuators split between rotary (shoulders, elbows, hips, knees) and linear (legs, torso). Each rotary actuator combines BLDC motor + harmonic reducer + encoder + torque sensor.
Key Fact
Tesla Optimus: 20 rotary + 14 linear actuators. Cost breakdown: reducer 36%, torque sensor 30%, motor 13.5%.
Human Bridge
Think of actuators as the robot's muscles. When one fails, the robot loses range of motion in that limb.
How robots think, learn, and generalize — and what it means for diagnostics.
Learn to predict how the physical world evolves in response to robot actions. Robots practice tasks "in imagination" before acting — reducing real-world data needs.
Examples
NVIDIA Cosmos, Wayve GAIA, Dreamer v3
Vision-Language-Action models unify perception, language, and control. The generalist reasoning layer — the robot's 'common sense' for embodied tasks.
Examples
π0 (Physical Intelligence), OpenVLA, RoboFlamingo, Helix (Figure), UnifoLM-VLA (Unitree)
Curated courses from MIT, Stanford, ETH Zurich, UC Berkeley, and more — all free and open access.
8 courses from DeepLearning.AI + NVIDIA, ETH Zurich, MIT, Stanford, TU Darmstadt, UC Berkeley, UPenn GRASP Lab — covering manipulation, kinematics, state estimation, perception, and reinforcement learning.
The 5 tools and communities every robotics practitioner should know.
Find shared components across platforms — identify common failure signatures, interchangeable parts, and supply bottlenecks.
Layer 3 — Human
Five certification levels from Operator to Autonomous Systems Architect. Study the components and platforms above, then take the exam.Platform-specific tracks available via URL params (e.g., ?platform=unitree-g1).
Strain wave reducers provide high gear ratios with near-zero backlash. Largest single cost driver (~36%) in rotary actuators.
Key Fact
Harmonic Drive holds 20-25% global market share. Alternatives: cycloidal-pin gear, planetary gearbox.
Human Bridge
Backlash (slop) is a primary failure symptom — feel it as imprecision or vibration at the end-effector.
Brushless DC motors are the dominant choice across humanoids for high torque density in compact form factors. Controlled by ESC/FOC drivers.
Key Fact
Dominant suppliers: Maxon (25-30%), Kollmorgen (15-20%). China alternative: PMSM low-inertia (Unitree).
Human Bridge
If a joint runs hot or draws unusual current, check the motor winding or ESC before replacing.
Largely standardized on NVIDIA Jetson (Orin, AGX Thor). Tesla uses its proprietary AI5 SoC. Key metrics: TOPS, TOPS/watt, memory bandwidth.
Key Fact
NVIDIA Jetson AGX Thor: 2,070 FP4 TFLOPS. Tesla AI5: proprietary.
Human Bridge
Heat + throttling = inference slowdown. Check thermal paste before suspecting software.
2-7 cameras per robot. IMUs for orientation. Force/torque sensors on joints. LiDAR for mapping. Tactile sensors on hands.
Key Fact
10 of 13 major OEMs have tactile sensing. Sony and Intel RealSense dominate cameras.
Human Bridge
Camera dropout = autonomy loss. IMU drift = balance instability. Each sensor has a clear failure signature.
Li-ion and Li-po packs. Operating times 2-14 hrs. Cell imbalance (±50mV delta) is the primary aging indicator.
Key Fact
Capacity range: 0.84-5 kWh. Charging: self-charge, hot-swap, wireless inductive.
Human Bridge
Monitor cell delta voltage, not just SOC. A swollen pack = thermal event risk — never charge it.
3-finger grippers to 22-DOF anthropomorphic hands. Drive types: tendon (1X, Tesla) vs motor+gear (Figure).
Key Fact
ORCA Dexterity (17 DOF, $3.5K-$6.1K) from ETH Zurich spinoff.
Human Bridge
Encoder drift, tendon tension loss, and sensor fouling each have distinct feel. L2+ cert required.
ISO 25785-1 (bipedal robots) working draft — expected 2026-27. ISO 10218: industrial robots. ISO 13482: service robots.
Key Fact
Only Agility Digit has NRTL field certification. EU AI Act applies to high-risk systems Aug 2026.
Human Bridge
LOTO before any physical work. Know which standard covers your robot — it determines liability.
Score trajectories against language instructions. Provide the dense reward signal that VLA policies need for RL training and data filtering.
Examples
Value-Order Correlation scorers, trajectory preference models
The sim-to-real gap is the central challenge. Domain randomization in simulation trains policies that transfer to real hardware.
Examples
Isaac Lab DR, MuJoCo DR, Genesis material variation