Robotics

Robotic Leg Links, Joint Housings and Drive Components

Lightweight structural limbs, joint housings and gear rings for quadruped, humanoid and industrial robots, machined with 0.005 mm bore concentricity and hard-coat anodizing.

Advanced robotics and quadruped platforms need structural components that minimize moving mass while maximizing torsional rigidity. Complex leg links, articulated joint clevices, strain-wave gear housings, and skeleton frames all require distortion control and dynamic multi-axis cutting to keep bearing seats aligned under high-frequency loads.

The Machining Challenge

Lightweight parts mean thin walls and pockets. Bearing seats must be coaxial across multiple faces, or joints bind and gears wear. Repeated re-fixturing would destroy the geometric relationships that make a robot arm repeatable.

How KGL Machines Robot Components

  • Simultaneous 5-axis milling. Dynamic tool vectoring reaches deep pocket recesses, angled weight-reduction pockets, and curved structural ribs. Uniform wall thickness and optimal stress distribution are the result.
  • 3+2 axis positioning. Bearing seats, actuator mounts, and sensor pockets are bored, reamed, faced, and tapped across multi-directional faces without repeated manual re-fixturing.
  • One-setup accuracy. Machining critical joint pivots, bearing bores, and mounting points from one coordinate origin keeps coaxiality and planarity exact.
  • Weight optimization. High-speed trochoidal milling removes excess material while preserving structural ribs, achieving mass reduction without sacrificing stiffness under impact.

Key Specifications

Geometric featureIndustry standardKGL premiumKGL ultra-precision
Bore concentricity and alignment±0.025 mm±0.008 mm±0.005 mm
Bearing seat position tolerance±0.05 mm±0.015 mm±0.005 mm
Parallelism and flatness (flanges)±0.05 mm±0.01 mm±0.005 mm
Perpendicularity (joint axes)±0.03 mm±0.01 mm±0.004 mm
Surface roughness (Ra)1.6 μm0.8 μm0.4 μm

Materials and Applications

Materials

  • AL7075-T6 / AL6061-T6 aerospace aluminum
  • Ti-6Al-4V Grade 5 titanium
  • Stainless 17-4 PH / SUS304 / SUS316L
  • PEEK / POM / Delrin engineering polymers

Applications

  • Quadruped leg links and hip frames
  • Humanoid shoulder and elbow housings
  • Harmonic drive flexspline mounts
  • Cobot forearm beams

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