Precision Aluminum Bent Tube Joint Housing with Bidirectional Flange Concentricity Control

We successfully manufactured a precision aluminum bent tube joint housing for a robotic joint application. This structural component combines cast aluminum profile sections with precision-machined interface features — featuring bidirectional flanges at both ends of a bent tube body. The component presented significant machining challenges including stringent bidirectional flange concentricity requirements and precise circumferential indexing of counterbore holes around both flanges. Through single-setup precision machining and optimized fixturing strategies, we delivered joint housings meeting demanding robotic assembly tolerances.

Project Overview

Key Technical Highlights

• Bidirectional Flange Concentricity Control: Achieved ≤0.015mm flange-to-flange concentricity through single-setup precision machining of both flange faces and bores from a common datum, eliminating re-fixturing errors that compromise alignment between the bent tube ends. Single-setup machining is critical for maintaining geometric consistency across distributed features.
• Process Innovation:
  • Single-Setup Precision Machining: Both flanges machined in a single fixturing setup using precision boring and facing operations, ensuring perfect coaxial alignment between flange bores and mounting faces.
  • Circumferential Counterbore Indexing: Rotary positioning with high-precision index table achieves ±0.02° circumferential indexing accuracy for counterbore hole arrays, ensuring consistent bolt pattern matching across both flanges.
  • Flange Surface Preparation: Dedicated facing and spot-facing operations achieve flatness ≤0.01mm on flange mounting surfaces.
• Surface Quality:
  • Precision finishing achieves Ra≤1.6μm surface finish on flange interface surfaces.
  • Clean machining of counterbore holes ensures proper fastener seating.

Quality Verification

Each component underwent comprehensive inspection using CMM measurement for flange concentricity (≤0.015mm), hole positional tolerance (±0.015mm), and flatness (≤0.01mm), supplemented by rotary indexing verification for circumferential hole pattern accuracy (≤0.02°).

Industry Applications

This solution demonstrates our expertise in precision robotic joint component manufacturing, ideal for:
✓ Robotic joint housings ✓ Bent tube structural components ✓ Precision actuator housings ✓ Robot arm interface components

Why Partner With Us?

• Proven expertise in bidirectional flange concentricity control on complex cast+machined components
• Advanced circumferential indexing capabilities for precision hole patterns
• Single-setup machining for consistent feature-to-feature geometry
• 12+ years of precision manufacturing experience across robotics and automation sectors