INDUSTRY COMPONENT

Upper Arm

The upper arm is a critical structural component of robotic arms that connects the shoulder joint to the elbow joint, providing reach and load-bearing capacity.

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Component Specifications

Definition
In industrial robotic arms, the upper arm is the primary load-bearing segment that extends from the shoulder joint to the elbow joint. This component transfers motion and torque from the shoulder actuator while supporting the weight of the forearm, wrist, and end effector. It determines the robot's maximum horizontal reach and vertical working envelope, with design considerations including stiffness-to-weight ratio, vibration damping, and thermal stability for precision applications.
Working Principle
The upper arm functions as a rigid lever arm that converts rotational motion from the shoulder joint into linear displacement at the end effector. It operates on principles of structural mechanics, maintaining dimensional stability under dynamic loads while minimizing deflection through optimized cross-sectional geometry and material selection. Kinematically, it establishes the second link in the robotic arm's kinematic chain, with its length directly influencing the robot's workspace volume and dexterity.
Materials
Typically manufactured from aluminum alloys (6061-T6, 7075-T6) for lightweight applications, carbon fiber composites for high stiffness-to-weight ratio, or steel alloys (AISI 4140, 4340) for heavy payload applications. Surface treatments include anodizing (aluminum), powder coating, or hard chrome plating for wear resistance.
Technical Parameters
  • Length 500-2000 mm
  • Weight 8-80 kg
  • Stiffness >100 N/μm
  • Maximum Speed 1-3 m/s
  • Repeatability ±0.02-0.1 mm
  • Payload Capacity 5-500 kg
  • Natural Frequency >50 Hz
  • Positioning Accuracy ±0.05-0.5 mm
Standards
ISO 9283, ISO 10218-1, DIN EN ISO 8373

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Upper Arm.

robotic arm upper arm industrial robot component automation equipment robotic manipulator manufacturing robotics arm segment payload capacity reach specification Upper Arm Upper Arm in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Robotic Arm

Multi-axis articulated manipulator for precise positioning and movement of welding tools

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Engineering Analysis

Risks & Mitigation
  • Structural fatigue failure
  • Excessive deflection under load
  • Resonance vibration
  • Thermal expansion affecting accuracy
  • Corrosion in harsh environments
FMEA Triads
Trigger: Cyclic loading exceeding fatigue limits
Failure: Crack propagation leading to catastrophic fracture
Mitigation: Implement regular non-destructive testing (ultrasonic, dye penetrant), design with adequate safety factors, use materials with high fatigue strength
Trigger: Insufficient stiffness design
Failure: Excessive deflection causing positioning errors
Mitigation: Optimize cross-sectional geometry (I-beam, box sections), use high-modulus materials, implement finite element analysis during design
Trigger: Natural frequency matching operational frequencies
Failure: Resonance causing vibration amplification and accuracy loss
Mitigation: Modal analysis during design, add damping materials, adjust operational parameters to avoid critical frequencies

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerances: ±0.1 mm for mounting interfaces, ±0.5 mm for overall length; Straightness: 0.1 mm/m; Parallelism: 0.05 mm between bearing surfaces
Test Method
Coordinate measuring machine (CMM) verification, laser tracker measurement for large components, static load testing to 150% of rated capacity, modal analysis for vibration characteristics, thermal cycling tests

Buyer Feedback

★★★★☆ 4.7 / 5.0 (11 reviews)

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Upper Arm so far."

"Testing the Upper Arm now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

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Frequently Asked Questions

What factors determine the optimal length of a robotic arm upper arm?

Upper arm length is determined by required workspace volume, payload capacity, speed requirements, and structural dynamics. Longer arms increase reach but reduce stiffness and natural frequency, requiring careful trade-off analysis.

How does upper arm material selection affect robotic performance?

Material choice directly impacts weight, stiffness, damping characteristics, and thermal expansion. Aluminum offers good strength-to-weight ratio, carbon fiber provides superior stiffness, while steel offers maximum strength for heavy payloads.

What maintenance is required for robotic arm upper arms?

Regular inspection for structural cracks, bearing wear in joint connections, verification of dimensional stability, and monitoring of vibration characteristics. Lubrication of pivot points and checking fastener torque are essential preventive measures.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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