---
title: "Spider Assembly"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:SPIDER_ASSEMBLY"
  data_integrity_hash: "ffbc5e545ca8eeb931619aa648228e0a"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:SPIDER_ASSEMBLY"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/spider-assembly.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/spider-assembly"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "Radial positioning tolerance: ±0.05 mm at 20°C, axial load capacity: 50-200 N, temperature range: -40°C to 300°C"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 0.15
    unit: "mm"
    consequence: "Plastic deformation due to stress concentration at spider arm fillets exceeding material yield strength, or thermal expansion mismatch between spider and control rod fingers causing binding at 0.15 mm radial displacement"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Stress corrosion cracking from chloride ion exposure at concentrations &gt;25 ppm in coolant"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Material substitution to nickel-chromium-molybdenum alloy with 0.02% maximum carbon content and protective coating"
  - node_2:
      trigger: "Thermal cycling between 50°C and 250°C at &gt;10 cycles/hour"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Redesign with integral forging instead of welding, implementing shot peening with 0.3 mm Almen intensity"
bom_nodes:
  central-hub:
    type: "part"
    urn: "URN:CNFX:ME:CENTRAL_HUB"
    interface_type: "physical-logic-coupled"
  radial-arms:
    type: "component"
    urn: "URN:CNFX:ME:RADIAL_ARMS"
    interface_type: "physical-logic-coupled"
  attachment-points:
    type: "component"
    urn: "URN:CNFX:ME:ATTACHMENT_POINTS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 286-1:2010 (GEOMETRICAL PRODUCT SPECIFICATIONS - LIMITS AND FITS)"
    scope: "Verified Engineering Specification"
  - standard: "DIN 7184-1:2016 (TOLERANCES FOR BEARINGS - RADIAL BEARINGS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/spider-assembly.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "e9f45cd829dfabeff3c021de7766b3a23f121a431ff3705a9c8a5b0aabeedf98"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Spider Assembly

## 1. Technical Definition
A structural component within a control rod assembly that provides radial support and positioning for control rod fingers or blades.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **Radial positioning tolerance: ±0.05 mm at 20°C, axial load capacity: 50-200 N, temperature range: -40°C to 300°C**. Failure boundary: **Radial deformation exceeding 0.15 mm under 250 N load, or material yield stress of 450 MPa reached**, Mechanism: **Plastic deformation due to stress concentration at spider arm fillets exceeding material yield strength, or thermal expansion mismatch between spider and control rod fingers causing binding at 0.15 mm radial displacement**.

### 2.1 Analytical Physics Model
Governed by the **Frame Structural Deflection Analysis**:

> **Primary Equation**: $\delta = \frac{5 q L^4}{384 E I}$  
> **Engineering Impact**: Ensures structural stability for multi-stage machines.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| q | Uniform Load | Engineering Constant |
| E | Elastic Modulus | Engineering Constant |
| I | Moment of Inertia | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Stress corrosion cracking from chloride ion exposure at concentrations &gt;25 ppm in coolant | 8 | Crack propagation through spider arm cross-section reducing load capacity by 70% | Material substitution to nickel-chromium-molybdenum alloy with 0.02% maximum carbon content and protective coating |
| Thermal cycling between 50°C and 250°C at &gt;10 cycles/hour | 8 | Low-cycle fatigue crack initiation at weld joints after 5,000 cycles | Redesign with integral forging instead of welding, implementing shot peening with 0.3 mm Almen intensity |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Central Hub](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/central-hub.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **CNC Machining Center**, **Coordinate Measuring Machine**, **Industrial Cleaning System**  
**Downstream Applications**: Nuclear Reactor Control Rod Assemblies, Industrial Valve Actuators, Precision Positioning Mechanisms  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What materials are commonly used for Spider Assemblies in control rod systems?
**A**: Spider Assemblies are typically manufactured from high-performance materials like Stainless Steel 316 for corrosion resistance, Inconel 718 for high-temperature strength, or Zirconium Alloy for nuclear applications, depending on operational requirements.

### Q: What is the primary function of a Spider Assembly in machinery?
**A**: The Spider Assembly serves as a critical structural component that provides radial support and precise positioning for control rod fingers or blades within control rod assemblies, ensuring stability and alignment in equipment operation.

### Q: What are the key components in a Spider Assembly BOM?
**A**: A standard Spider Assembly Bill of Materials includes a Central Hub for core stability, Radial Arms extending outward for support, and Attachment Points for securing control rod fingers or blades to the assembly structure.

## 6. Manufacturing Compliance
- ISO 286-1:2010 (GEOMETRICAL PRODUCT SPECIFICATIONS - LIMITS AND FITS)
- DIN 7184-1:2016 (TOLERANCES FOR BEARINGS - RADIAL BEARINGS)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Spider Assembly](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/spider-assembly)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **3** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: SPIDER_ASSEMBLY | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 96c37e09
