Forearm: Payload Capacity 5-500 kg, Length 300-1200 mm

Component Specifications

Definition

The robotic forearm is a critical structural and functional component of industrial robotic arms, extending from the elbow joint to the wrist assembly. It provides the necessary reach, rigidity, and motion transmission for end-effector positioning while supporting payloads and resisting operational forces. This component houses internal drive mechanisms (harmonic drives, gears, cables) and often integrates wiring/pneumatic lines for tool control.

Working Principle

The forearm functions as a rigid lever arm that transmits rotational motion from the elbow joint to position the wrist in 3D space. It maintains structural integrity under combined bending, torsion, and compression loads while minimizing deflection to ensure positioning accuracy. Internal drive systems convert motor torque into precise angular movements at the wrist.

Materials

Aircraft-grade aluminum alloys (7075-T6, 6061-T6) for standard applications; carbon fiber composites for high stiffness-to-weight ratio; titanium alloys for corrosive environments; steel alloys for heavy payload applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	300-1200 mm
Weight	2-50 kg
Stiffness	>100 Nm/deg
Repeatability	±0.02-0.1 mm
Payload Capacity	5-500 kg
Positioning Accuracy	±0.05-0.5 mm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9787, ISO 9283, DIN EN ISO 10218-1

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

View Product Details

Engineering Analysis

Risks & Mitigation

Structural fatigue failure
Bearing wear in joints
Vibration-induced positioning errors
Corrosion in harsh environments
Cable/hose fatigue from repeated bending

FMEA Triads

Trigger: Cyclic loading exceeding material fatigue limits
Failure: Crack propagation leading to structural failure
Mitigation: Regular ultrasonic inspection, finite element analysis during design, implementation of load monitoring systems

Trigger: Inadequate lubrication in elbow/wrist joints
Failure: Increased friction, overheating, and premature bearing failure
Mitigation: Scheduled maintenance with specified lubricants, installation of automatic lubrication systems

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm on critical mounting surfaces, ±0.05° on joint interfaces

Test Method

Laser tracker measurement for positioning accuracy, load deflection testing per ISO 9283, vibration analysis for natural frequency determination

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Forearm

Manufacturer profiles associated with Forearm.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What factors determine robotic forearm length selection?

Forearm length is determined by required reach, payload capacity, and workspace constraints. Longer forearms increase reach but reduce stiffness and maximum payload capacity due to increased moment arms.

How does forearm material affect robotic performance?

Material selection impacts weight, stiffness, vibration damping, and corrosion resistance. Aluminum offers good strength-to-weight ratio, carbon fiber provides superior stiffness, while steel handles heavier payloads with increased weight.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Forearm