Automated Cable Specimen Preparation System for IS 10810 and IS 7098 Compliance.

1. Executive Snapshot

Summary

The Smart India Hackathon Problem Statement SIH26030, titled "Automated Cable Specimen Preparation System for IS 10810 and IS 7098 Compliance," sponsored by the Department of Consumer Affairs (DoCA) under the Ministry of Consumer Affairs, Food & Public Distribution, seeks an electro-mechanical smart automation solution to eliminate manual errors and inconsistencies in preparing cable test specimens [PS]. Physical testing of electrical cables—such as conductor resistance, insulation tensile strength, hot set, water absorption, and thermal ageing—requires strict adherence to Bureau of Indian Standards (BIS) specifications, specifically IS 10810 (Parts 2, 7, 33) and IS 7098 (Parts 1 & 2) [PS]. Currently, sample preparation involves manual cable cutting, manual straightening, hand-slicing PVC/XLPE/HDPE sheaths, and manual punching of dumbbell-shaped test pieces [PS]. These manual operations introduce cut irregularities, non-uniform thickness, edge micro-tears, and thermal/mechanical prestrain, leading to invalid test results, high rejection rates, operator safety hazards, and audit non-compliance in certified laboratories [INFERENCE].

The proposed solution is a compact, benchtop automated cable specimen preparation machine controlled by a embedded microcontroller/PLC system with touchscreen HMI. It features an automated motorized feeding and self-centering clamping mechanism, an integrated contactless/optical diameter sensor, a high-precision multi-axis motorized cutter and circumferential stripper module, an integrated dumbbell die press, automated specimen-vs-waste ejection, and Category 3 hardware safety interlocks [INFERENCE].

Metadata Table

Fundamental System Objective

To design and construct an automated electro-mechanical machine with integrated auto-diameter sensing, self-centering feed rollers, programmable depth cutting/stripping, dumbbell shape punching, and PLC/HMI closed-loop control that prepares compliant cable test specimens according to IS 10810 and IS 7098 standards without human bias or safety risks [PS].

2. Problem Deconstruction

The explicit description in the problem statement contains specific functional and operational mandates [PS]. Below is the atomic extraction and implementation breakdown:

Explicit Requirements

• R1: Automated Cable Feeding and Clamping System

  • Source Text: "Automated Cable Feeding and Clamping System utilizing motor-driven rollers and adjustable clamps for secure, straightened cable handling." [PS]
  • Interpretation: Cable samples must be automatically pulled into the working zone via motorized drive rollers and held firmly by motorized or pneumatic self-centering V-clamps to eliminate pre-bending and manual misalignment [INFERENCE].
  • Implementation Implication: Dual stepper/servo driven drive rollers with high-friction urethane grips paired with dual self-centering V-jaw clamps [INFERENCE].
  • Tag: [PS]

• R2: Precision Cutting and Stripping Module

  • Source Text: "The Cutting and Stripping Module employs precision blades with programmable depths for clean, circumferential cuts and linear stripping, fulfilling specific length requirements for various tests." [PS]
  • Interpretation: Rotary/circumferential and axial stripping blades must plunge to exact micrometer depths matching insulation/sheath thickness, slitting the outer layer cleanly without nicking internal conductors or underlying layers [INFERENCE].
  • Implementation Implication: Motorized lead-screw linear actuator carrying a hardened tungsten carbide slitting blade with sub-0.05mm depth positioning resolution [INFERENCE].
  • Tag: [PS]

• R3: Integrated Diameter Sensor

  • Source Text: "An integrated diameter sensor will auto-adjust settings." [PS]
  • Interpretation: Prior to cutting, the machine must measure the outer diameter (OD) of the inserted cable automatically and dynamically compute blade depth, clamp width, and roller clearance without manual operator measurement [INFERENCE].
  • Implementation Implication: Non-contact optical laser curtain sensor or linear potentiometer-encoder mounted on the self-centering clamp jaws [INFERENCE].
  • Tag: [PS]

• R4: Control System (PLC/HMI)

  • Source Text: "A Control System (PLC/HMI) manages operations, allows test method selection, monitors status, and provides closed-loop feedback." [PS]
  • Interpretation: A dedicated industrial controller or high-reliability embedded system running a touchscreen interface where operators select IS standard pre-sets (e.g. IS 10810 Part 7 Tensile, Part 33 Water Absorption, Part 2 Conductor Resistance) and monitor machine telemetry [INFERENCE].
  • Implementation Implication: Industrial PLC (or STM32/ESP32 micro-controller for hackathon MVP) coupled with a 7-inch color capacitive touchscreen HMI running recipe-based state machine logic [INFERENCE].
  • Tag: [PS]

• R5: Automated Specimen Ejection & Waste Management

  • Source Text: "Automated specimen ejection and waste management further streamline workflow." [PS]
  • Interpretation: Processed test specimens (straightened conductor wires, sheath slices, or punched dumbbells) must be deposited into a clean specimen bin, while stripped insulation off-cuts and sheath scrap are diverted to a separate waste chute [INFERENCE].
  • Implementation Implication: Dual-chute mechanical diverter flap driven by a mini-servo motor or solenoid actuator [INFERENCE].
  • Tag: [PS]

• R6: Robust Safety Features & Interlocks

  • Source Text: "Robust safety features like enclosed areas and interlocks will protect operators." [PS]
  • Interpretation: Cutting and punching zones must be physically enclosed behind transparent polycarbonate shields equipped with safety switches that cut power to actuators if opened during operation [INFERENCE].
  • Implementation Implication: Transparent acrylic/polycarbonate safety canopy with magnetic switch interlocks wired directly to an Emergency Stop (E-Stop) relay circuit [INFERENCE].
  • Tag: [PS]

• R7: Standard Compliance Scope (IS 10810 Parts 2, 7, 33 & IS 7098 Parts 1 & 2)

  • Source Text: "...preparing specimens that strictly adhere to the aforementioned IS standards... PVC/XLPE/HDPE cable samples..." [PS]
  • Interpretation: System must support sample preparation for:
    • IS 10810 Part 2: Tensile testing of aluminum conductors (straightened wire, gauge length 250mm) [RESEARCHED].
    • IS 10810 Part 7: Tensile strength and elongation of insulation/sheath (dumbbell specimens or tubular samples with parallel faces, thickness 0.8mm - 2.0mm, marker lines 20mm/50mm apart) [RESEARCHED].
    • IS 10810 Part 33: Water absorption gravimetric test (precise tubular/ring slices with clean cut faces) [RESEARCHED].
    • IS 7098 Part 1 & Part 2: Cross-linked polyethylene (XLPE) insulated cables up to 1.1kV (Part 1) and 3.3kV - 33kV (Part 2) [RESEARCHED].
  • Tag: [PS]

Inferred Technical Requirements

• IMP1: Secondary Dumbbell Punching / Slicing Sub-Module
  • Source Text: "...these straightened PVC/XLPE/HDPE cable samples are cut into slices using electrically/pneumatically operated machines. Further, the samples are shaped as dumbbells by a dumbbell cutting machine." [PS]
  • Derivation: To yield IS 10810 Part 7 compliant dumbbell specimens from stripped insulation sheaths, the machine must include an integrated pneumatic/toggle press station equipped with an IS 10810 Part 7 standard steel dumbbell cutting die (75mm overall length, 12.5mm width) [RESEARCHED].
  • Tag: [INFERENCE]

3. Stakeholders & User Needs

4. Requirements Traceability

5. Constraints & Environment Realities

Field & Operational Realities

1. Material Hardness Variability:
   • PVC (Polyvinyl Chloride): Flexible to semi-rigid (Shore A 70–95) [KNOWN]. Easy to cut at room temperature but tears if blade is dull [INFERENCE].
   • XLPE (Cross-linked Polyethylene): Tough, rubbery elastomeric memory (Shore D 50–65) [KNOWN]. Resists cutting; requires sharp tungsten carbide edges and steady feeding force without thermal melting [INFERENCE].
   • HDPE (High-Density Polyethylene): Rigid, high yield strength (Shore D 60–70) [KNOWN]. Requires high clamping force to prevent slipping and higher cutting force [INFERENCE].
2. Lab Footprint & Power Constraints:
   • Standard cable testing labs run on 220V AC single-phase power, with standard compressed air supply (6–8 bar) available in industrial QA labs [KNOWN].
   • The equipment must fit on a standard laboratory workbench (Max footprint: $800 \times 600 \times 600 \text{ mm}$, weight $< 45 \text{ kg}$) [ASSUMPTION].
3. Cable Diameter & Profile Diversity:
   • Cable outer diameters range from 4 mm (single-core LT wire) up to 35 mm (multi-core armored HT cable sheaths) [RESEARCHED]. The clamping and sensing mechanism must accommodate this range seamlessly [INFERENCE].
4. No Thermal Degradation Permitted:
   • Thermal cutting (e.g. heated wire or laser slitting) cannot be used because high temperatures alter the cross-linking, molecular structure, and mechanical tensile properties of XLPE and PVC, invalidating IS 10810 Part 7 and Part 11 testing [RESEARCHED]. Cold mechanical slitting is mandatory [INFERENCE].

6. Research Questions

1. RQ-1: What are the exact dimensional tolerances for IS 10810 Part 7 dumbbell specimens?
   • Finding: Standard dumbbell dies require a 75 mm overall length, 12.5 mm width at ends, 4 mm width of narrow parallel portion, and gauge length of 20 mm or 50 mm, with specimen thickness between 0.8 mm and 2.0 mm [RESEARCHED].
2. RQ-2: How does IS 10810 Part 2 require aluminum conductor wires to be prepared?
   • Finding: Aluminum conductors must be stripped of all insulation without nicking or scratching the metal surface. The required gauge length is 250 mm with straight alignment for gripping in a Universal Testing Machine (UTM) [RESEARCHED].
3. RQ-3: What is the specimen geometry for IS 10810 Part 33 (Water Absorption Gravimetric Test)?
   • Finding: Requires thin cylindrical slices or tubular strips of insulation/sheath cut cleanly perpendicular to the cable axis with uniform thickness and known surface area [RESEARCHED].
4. RQ-4: What is the required blade positioning resolution to strip sheath without nicking inner conductors?
   • Finding: Radial blade positioning resolution must be $\le 0.05 \text{ mm}$ (50 microns) driven by micro-stepper lead screws [INFERENCE].
5. RQ-5: What non-contact optical sensing technology is reliable for measuring black carbon XLPE/HDPE cable diameters?
   • Finding: Standard infrared diffuse sensors fail on high-absorbance black sheaths. A laser thrum-beam curtain sensor or high-precision mechanical encoder linked to self-centering clamping jaws is required [RESEARCHED].

7. Data Requirements & Sources

Data Categorization Breakdown

• A. Explicitly Mentioned Data: IS 10810 (Parts 2, 7, 33) dimensional requirements, IS 7098 cable profiles, measured cable diameter [PS].
• B. Inferred Data: Motor step counts per millimeter, knife plunge depths, clamp pressure thresholds, operator IDs, calibration zero-offsets [INFERENCE].
• C. Data to Collect: Real-time diameter sensor voltage/digital pulses, encoder position feedback, safety limit switch status [INFERENCE].
• D. Synthetic / Simulated Data: Simulated NABL LIMS test requests and mock cable batch numbers for demo purposes [ASSUMPTION].
• E. Data Needing Validation: Exact radial cut depth adjustments required for aged or non-concentric XLPE sheaths [NEEDS VALIDATION].

8. Existing Solutions & Gap Analysis

9. Candidate Solution Approaches

Approach 1: Pure Industrial PLC + Electro-Pneumatic Rotary Machine

• Mechanism: Heavy-duty pneumatic cylinder clamps, pneumatic rotary slitting head, Siemens S7-1200 PLC, pneumatic dumbbell punch press, and laser distance sensor [INFERENCE].
• Data Requirements: Fixed PLC register tables, RS485 Modbus telemetry [INFERENCE].
• Complexity: High industrial complexity; heavy mechanical frame (>60 kg) [INFERENCE].
• Cost: High ($\approx \text{₹}1,80,000 - \text{₹}2,50,000$ for industrial components) [INFERENCE].
• Explainability: High (Standard industrial ladder logic) [INFERENCE].
• Scalability: High industrial robustness [INFERENCE].
• Hackathon Feasibility: Low (Too heavy, expensive, and rigid for a 3-day student hackathon build) [INFERENCE].
• Production Feasibility: Excellent for high-volume NABL testing facilities [INFERENCE].

Approach 2: Embedded Microcontroller Motorized Benchtop Prototype (Recommended for Hackathon)

• Mechanism: Dual stepper-driven polyurethane feed rollers, self-centering lead-screw V-clamps driven by NEMA 17 stepper, optical/contact diameter sensor, 2-axis stepper slitting carriage with tungsten blade, toggle/screw-driven dumbbell die station, and STM32/ESP32 controller with 7" Nextion/RPi HMI [INFERENCE].
• Data Requirements: Embedded JSON recipe profiles, SPI/I2C sensor streams [INFERENCE].
• Complexity: Moderate, highly modular and modularly testable [INFERENCE].
• Cost: Low-to-Moderate ($\approx \text{₹}25,000 - \text{₹}40,000$ prototype BOM) [INFERENCE].
• Explainability: Excellent (Open-source firmware, clear mechanical demonstration) [INFERENCE].
• Scalability: Good (Can be scaled up to pneumatic/industrial actuators later) [INFERENCE].
• Hackathon Feasibility: High (Realistically buildable and demonstrable by a 4-6 student team) [INFERENCE].
• Production Feasibility: High with industrial component substitution [INFERENCE].

Approach 3: Laser-Cutting & 6-DOF Robotic Arm Cell

• Mechanism: 6-DOF articulated robotic arm feeding cable samples into a high-power CO2 laser cutter for sheath stripping and dumbbell profiling [INFERENCE].
• Data Requirements: 3D Vision point cloud, G-code path generation [INFERENCE].
• Complexity: Extremely high [INFERENCE].
• Cost: Very High (>$\text{₹}5,00,000$) [INFERENCE].
• Explainability: Low [INFERENCE].
• Scalability: Poor (High maintenance) [INFERENCE].
• Hackathon Feasibility: Zero [INFERENCE].
• Production Feasibility: Unsuitable (CO2 laser causes thermal degradation and carbonization of XLPE/PVC edges, violating IS 10810 mechanical test validity) [RESEARCHED].

10. Recommended Approach & Why

Selection

Hybrid Approach: Embedded Microcontroller/PLC-driven Motorized Benchtop System with Cold Mechanical Slitting and Integrated Dumbbell Die Punching (Approach 2 scaled for Hackathon MVP, convertible to Approach 1 for Industrial Production) [INFERENCE].

  [Cable Insertion]
          │
          ▼
┌──────────────────┐
│ Auto-Sensing OD  │ ◄── (Optical / Encoder Sensor)
└────────┬─────────┘
         │
         ▼
┌──────────────────┐
│ Self-Centering   │ ◄── (Motorized Feed & V-Clamps)
│  Feed & Clamp    │
└────────┬─────────┘
         │
         ▼
┌──────────────────┐
│ Precision Cut &  │ ◄── (Micro-Stepper Carbide Blade)
│ Axial Stripping  │
└────────┬─────────┘
         │
         ├─────────────────────────┬─────────────────────────┐
         ▼                         ▼                         ▼
┌──────────────────┐      ┌──────────────────┐      ┌──────────────────┐
│ IS 10810 Pt 2    │      │ IS 10810 Pt 7    │      │ IS 10810 Pt 33   │
│ Conductor Wire   │      │ Dumbbell Punch   │      │ Ring/Slice Cut   │
└────────┬─────────┘      └────────┬─────────┘      └────────┬─────────┘
         │                         │                         │
         └─────────────────────────┼─────────────────────────┘
                                   │
                                   ▼
                        ┌─────────────────────┐
                        │ Auto-Ejection Gate  │
                        │ (Specimen vs Scrap) │
                        └─────────────────────┘

Justification

1. Compliance Preservation: Cold mechanical cutting via hardened tungsten carbide blades preserves the virgin mechanical, elastomeric, and cross-linked properties of PVC/XLPE/HDPE without thermal damage [RESEARCHED].
2. Feasibility & Cost: Can be fully fabricated within hackathon timelines using precision 3D printed housings, aluminum T-slot extrusions, NEMA steppers, linear rails, and standard microcontroller boards [INFERENCE].
3. Rejection of Alternatives:
   • Approach 3 (Laser) was rejected because heat-affected zones (HAZ) compromise material tensile strength, directly violating IS 10810 Part 7 [RESEARCHED].
   • Approach 1 (Pure Heavy Pneumatics) was rejected for the hackathon prototype due to transportability limits, compressed air dependence during stage pitching, and higher component lead times [INFERENCE].

11. Technical Architecture

Layered System Architecture Diagram

===================================================================================
1. USER INTERFACE & RECIPE LAYER
   ┌─────────────────────────────────────────────────────────────────────────────┐
   │ 7" Color Touchscreen HMI (Nextion / Raspberry Pi UI)                        │
   │ - Test Mode Selection: IS 10810 Pt 2 (Al Wire) / Pt 7 (Dumbbell) / Pt 33   │
   │ - Live Status Display, Real-time Diameter Reading, Emergency Stop Button   │
   └─────────────────────────────────────────────────────────────────────────────┘
===================================================================================
2. EMBEDDED CONTROL & LOGIC LAYER
   ┌─────────────────────────────────────────────────────────────────────────────┐
   │ Primary Microcontroller / Compact PLC (STM32F4 / ESP32-S3)                  │
   │ - Homing & Hysteresis Algorithms                                            │
   │ - Dynamic Blade Depth Math: Plunge Depth = (OD - Conductor_Dia)/2 - Clearance │
   │ - Closed-Loop Feedback Control (Encoder Reading + Limit Switch Verification) │
   └─────────────────────────────────────────────────────────────────────────────┘
===================================================================================
3. SENSOR & SAFETY INTERLOCK LAYER
   ┌───────────────────────────────────────────────┬─────────────────────────────┐
   │ Sensors:                                      │ Safety System:              │
   │ - Optical Laser / Contact Potentiometer OD    │ - Magnetic Cover Interlock  │
   │ - Optical End-of-Stroke Limit Switches        │ - Physical E-Stop Cutoff    │
   │ - Quadrature Feed Encoders                    │ - Over-current Detection    │
   └───────────────────────────────────────────────┴─────────────────────────────┘
===================================================================================
4. ACTUATION & DRIVER LAYER
   ┌─────────────────────────────────────────────────────────────────────────────┐
   │ Stepper & Servo Drivers (TMC2209 / TB6600 Silent Drivers)                   │
   │ - Motor 1: Feed Rollers (NEMA 17/23 High Torque)                           │
   │ - Motor 2: Self-Centering Clamp Lead-Screw                                  │
   │ - Motor 3: Radial Blade Plunge Stepper (0.01mm micro-step accuracy)         │
   │ - Motor 4: Axial Slitting Carriage Traverse Stepper                        │
   │ - Actuator 5: Pneumatic / Linear Solenoid Dumbbell Die Press               │
   │ - Actuator 6: Ejection Diverter Servo Gate                                  │
   └─────────────────────────────────────────────────────────────────────────────┘
===================================================================================
5. PHYSICAL MECHANICAL MODULES
   ┌──────────────────┬──────────────────┬──────────────────┬────────────────────┐
   │ Feed & Clamp     │ Cutting Head     │ Dumbbell Punch   │ Ejection Chute     │
   │ - Polyurethane   │ - Rotary Blade   │ - Hardened Die   │ - Specimen Tray    │
   │   Rollers        │ - Axial Blade    │ - Anvil Plate    │ - Scrap Bin Gate   │
   └──────────────────┴──────────────────┴──────────────────┴────────────────────┘
===================================================================================

Data-Flow Narrative

1. Initialization: Operator powers on system, safety canopy interlock check verifies enclosure is closed [INFERENCE]. System performs homing sequence on all axes [INFERENCE].
2. Recipe Selection: Operator selects desired test method on HMI (e.g., "IS 10810 Part 7 - XLPE Sheath Dumbbell") [INFERENCE].
3. Cable Loading & OD Sensing: Cable sample is inserted into feed funnel. Motorized feed rollers engage. The integrated diameter sensor measures outer diameter (OD) and feeds the value to the control unit [INFERENCE].
4. Auto-Clamping & Depth Calculation: Self-centering V-clamps close to grip cable axis precisely. Controller calculates required radial blade plunge depth based on OD and stored sheath thickness profile [INFERENCE].
5. Circumferential & Longitudinal Slitting:
   • The slitting module plunges the carbide blade to calculated depth [INFERENCE].
   • The rotary cutting head rotates $360^\circ$ around the cable for circumferential end-cuts [INFERENCE].
   • The carriage traverses axially along the cable length to perform a clean longitudinal slit [INFERENCE].
6. Core Extraction & Sheath Flattening: The inner conductor core is automatically pushed forward into the conductor collection chute. The severed sheath ribbon is drawn into the flattening rollers leading to the dumbbell punch station [INFERENCE].
7. Dumbbell Punching (for IS 10810 Pt 7): The sheath ribbon is indexed under the IS 10810 Part 7 standard die. The pneumatic/toggle punch fires, stamping a clean dumbbell specimen [INFERENCE].
8. Ejection & Waste Sorting: The ejection gate switches angle: the punched dumbbell specimen falls into the "Validated Specimen Bin", while leftover edge trims drop into the "Waste Bin" [INFERENCE]. HMI displays execution summary and logs batch data [INFERENCE].

12. Technology Stack

13. AI/ML Justification

Is AI/ML Strictly Required for Specimen Preparation?

NO. The primary task of measuring cable diameter, positioning cutting blades, stripping sheaths, and punching dumbbell dies is a deterministic mechanical precision problem best solved by closed-loop mechatronics, micro-stepping motors, and geometric math [INFERENCE]. Forcing AI into blade trajectory control introduces non-deterministic latency and potential positioning failure [INFERENCE].

Optional/Secondary AI Application: Computer Vision Quality Verification

A lightweight computer vision (CV) system can be added strictly as an inspection stage after specimen ejection [INFERENCE].

1. Exact Problem Solved: Automated post-cut inspection of prepared dumbbell specimens to verify edge smoothness and detect micro-nicks, burrs, or dimensional non-conformance before tensile testing [INFERENCE].
2. Input: High-resolution RGB macro image of the prepared specimen taken inside the ejection chute under LED backlighting [INFERENCE].
3. Output: Pass/Fail flag with detected defect overlay (e.g. "Edge Nick Detected at Gauge Center - Specimen Rejected") [INFERENCE].
4. Why Rules Cannot Solve It easily: Visual edge irregularities and micro-tears on semi-flexible polymer cuts are variable in shape and contrast, making classical thresholding sensitive to light shadows [INFERENCE].
5. Data Required: ~500 images of compliant vs. defective (nicked/burred/crooked) dumbbell cuts [ASSUMPTION].
6. Evaluation: Precision-Recall AUC on defect detection ($\ge 98%$ recall required to prevent defective specimens from entering UTM testing) [ASSUMPTION].
7. Failure Mode & Fallback: If CV model fails or camera is obscured, system defaults to manual visual inspection prompt on HMI without stopping mechanical production [INFERENCE].
8. Training Required: Yes, edge-detection model trained via YOLOv8-Nano / OpenCV contour analysis [INFERENCE].
9. Fine-Tuning: Fine-tuned on laboratory lighting conditions [INFERENCE].
10. RAG Required: No [INFERENCE].
11. Computer Vision Required: Yes (Optional inspection stage) [INFERENCE].
12. Speech Processing Required: No [INFERENCE].
13. Forecasting Required: No [INFERENCE].
14. Human Oversight: High. Lab technician retains final override authority [INFERENCE].

14. Data Architecture & Offline/Low-Network Design

Machine Configuration Schema (JSON / Embedded)

{
  "machine_id": "SIH-CABLE-PREP-01",
  "firmware_version": "1.2.0",
  "calibration": {
    "laser_zero_offset_mm": 1.25,
    "blade_home_position_steps": 4500,
    "clamp_pressure_limit_N": 150
  },
  "standards_recipes": [
    {
      "recipe_id": "IS_10810_P7_XLPE",
      "standard_name": "IS 10810 Part 7 (Tensile/Elongation)",
      "material": "XLPE",
      "target_specimen": "Dumbbell",
      "min_thickness_mm": 0.8,
      "max_thickness_mm": 2.0,
      "strip_length_mm": 120,
      "dumbbell_die_type": "75mm_Standard",
      "blade_speed_mm_sec": 15
    },
    {
      "recipe_id": "IS_10810_P2_AL",
      "standard_name": "IS 10810 Part 2 (Conductor Tensile)",
      "material": "Aluminum Wire",
      "target_specimen": "Straight Wire",
      "gauge_length_mm": 250,
      "strip_length_mm": 300,
      "blade_speed_mm_sec": 25
    }
  ]
}

Local Storage & Offline Operation

• 100% Offline Standalone Operation: The machine runs entirely without an internet connection [INFERENCE]. All test recipes, calibration parameters, and state logic reside on internal Microcontroller Flash memory and an onboard SPI Flash / SD Card [INFERENCE].
• Data Logging & Synchronization: Process logs (cable OD, batch ID, timestamp, pass/fail status) are stored in an append-only binary/CSV file on the local SD card [INFERENCE]. When connected to a lab network via Ethernet or Wi-Fi, logs sync to the NABL LIMS server via MQTT or HTTP REST [INFERENCE].
• Bandwidth Reduction: Only lightweight JSON/CSV records (~1 KB per prepared specimen) are transmitted [INFERENCE].

15. Security, Privacy & Governance

• Personal & Location Data: Zero Personal Identifiable Information (PII) or location tracking is collected [INFERENCE]. Machine logs store only Operator ID, Batch Number, Timestamp, and Dimensional Telemetry [INFERENCE].
• Hardware Physical Safety & Interlocks:
  • Category 3 / SIL 2 Physical Safety Interlocks: Dual-channel magnetic reed switches on the enclosure window cut power to stepper motor power rails via an emergency stop relay if opened during cutting/stripping [INFERENCE].
  • Mechanical Blade Guard: Blades automatically retract into a safe shield block when stationary [INFERENCE].
• Role-Based Access Control (RBAC): HMI supports two user levels:
  1. Operator Mode: Can only select existing recipes and initiate cut sequences [INFERENCE].
  2. Admin / Calibration Mode: Requires PIN code to adjust motor step offsets, laser zero-point, or create custom test recipes [INFERENCE].
• Regulatory & NABL Disclaimer: The machine's dimensional outputs must be validated periodically using calibrated Vernier calipers or optical profile projectors to maintain NABL laboratory accreditation [INFERENCE].

16. MVP Scope (Hackathon Build)

┌─────────────────────────────────────────────────────────────────────────┐
│                          HACKATHON MVP SCOPE                            │
├─────────────────────────────────────────────────────────────────────────┤
│ [MUST BUILD]                                                            │
│ ─ Working benchtop mechanical frame (Aluminum profile + Polycarbonate) │
│ ─ Motorized feed rollers & self-centering V-clamp mechanism            │
│ ─ Integrated OD optical/contact diameter sensor with dynamic calibration │
│ ─ Motorized slitting carriage with programmable radial plunge depth    │
│ ─ 7" Touchscreen HMI with IS 10810 (Part 2 & Part 7) recipe profiles    │
│ ─ Physical Safety Canopy with Magnetic Cutoff Switch & E-Stop Button    │
│ ─ Manual/Lever-assisted Dumbbell Die Press station                      │
├─────────────────────────────────────────────────────────────────────────┤
│ [SHOULD BUILD]                                                          │
│ ─ Automated dual-chute specimen vs. waste diverter flap                 │
│ ─ SD Card batch logging (CSV format)                                    │
├─────────────────────────────────────────────────────────────────────────┤
│ [NICE TO HAVE]                                                          │
│ ─ Basic OpenCV camera verification of dumbbell edge quality              │
│ ─ Wi-Fi Web Dashboard for telemetry monitoring                          │
├─────────────────────────────────────────────────────────────────────────┤
│ [DO NOT BUILD DURING HACKATHON]                                         │
│ ─ Pneumatic 100kV High-voltage cable sheath cutters (Too dangerous)     │
│ ─ Cloud LIMS enterprise integration                                     │
└─────────────────────────────────────────────────────────────────────────┘

17. Live Demo Simulation Plan

To convince judges during the SIH evaluation, the team must present a fully functioning, live physical hardware demonstration [INFERENCE]:

1. Hardware Set-up on Stage: A working benchtop machine operating on 220V power [INFERENCE].
2. Live Material Processing:
   • The team will bring real samples of 1.5mm², 4mm², and 10mm² LT PVC & XLPE cables (widely available and safe to cut on stage) [INFERENCE].
   • Step 1: Select "IS 10810 Part 7 - XLPE Dumbbell" on the HMI touchscreen [INFERENCE].
   • Step 2: Insert a 200mm cable sample into the feed inlet [INFERENCE].
   • Step 3: Demonstrate live OD measurement on the screen (e.g. "Measured OD: 8.42 mm -> Plunge Depth Set: 1.15 mm")[INFERENCE].
   • Step 4: Watch through the transparent polycarbonate canopy as clamps engage, circumferential end-cuts are executed, and axial stripping slits the sheath cleanly without touching the internal copper/aluminum conductors [INFERENCE].
   • Step 5: The stripped sheath ribbon feeds into the die press, where the dumbbell is punched, and the specimen drops cleanly into the specimen tray while scrap drops into waste [INFERENCE].
3. Safety Interlock Demo: During an active cut sequence, open the safety canopy. Demonstrate that all motion halts instantaneously within $<50 \text{ ms}$, triggering a visual alert on the HMI [INFERENCE].
4. Verification: Pass the live-prepared dumbbell specimen to the judges alongside a digital Vernier caliper to verify that parallel width equals $4.0 \pm 0.1 \text{ mm}$ and thickness matches IS 10810 Part 7 tolerances [INFERENCE].

18. Implementation Roadmap

Target Completion Deadline: 30 September 2026 [PS].

2026 Roadmap
┌──────────┬──────────┬──────────┬──────────┬──────────┐
│ JUN 2026 │ JUL 2026 │ AUG 2026 │ SEP 1-15 │ SEP 16-30│
└────┬─────┴────┬─────┴────┬─────┴────┬─────┴────┬─────┘
     │          │          │          │          │
     ▼          │          │          │          │
Phase 1: CAD & Mechanical Design      │          │
(Frames, Clamps, Cutter Head)         │          │
                ▼          │          │          │
        Phase 2: Hardware Assembly & Electronics │
        (Steppers, Laser Sensor, Firmware Drivers)│
                           ▼          │          │
                   Phase 3: Control Logic & HMI  │
                   (IS Recipes, Closed-Loop Math)│
                                      ▼          │
                              Phase 4: Calibration & Testing
                              (IS 10810 Sample Runs & Tolerances)
                                                 ▼
                                         Phase 5: Refinement, Safety
                                         Enclosure & Final Polish

• Phase 1: CAD Modeling & Mechanical Fabrication (Weeks 1–3 / Jun 2026): Design 3D CAD assembly in Fusion360/SolidWorks. CNC machining/3D printing of custom clamping jaws, cutter head mounts, and purchasing aluminum extrusion frame [INFERENCE].
• Phase 2: Electronics Assembly & Driver Wiring (Weeks 4–5 / Jul 2026): Wire STM32/ESP32, TMC2209 stepper drivers, optical laser sensor, and power supply. Test individual motor axes [INFERENCE].
• Phase 3: Control Logic & HMI Development (Weeks 6–8 / Aug 2026): Write motor control state machine logic, recipe selection UI on Nextion HMI, and dynamic depth calculation math [INFERENCE].
• Phase 4: Calibration & Specimen Testing (Weeks 9–10 / Early Sep 2026): Run test cuts on PVC, XLPE, and HDPE cables. Measure specimen dimensions using Vernier calipers and optical comparator to verify IS 10810 Part 7 & Part 33 tolerances [INFERENCE].
• Phase 5: Safety Enclosure & Demo Polish (Weeks 11–12 / Mid-Late Sep 2026): Install polycarbonate cover, magnetic interlocks, E-Stop switch, waste chute, and finalize presentation materials prior to 30 September 2026 deadline [INFERENCE].

19. Testing & Validation Plan

20. Risk Register

21. Cost & Scalability

Hackathon Prototype Cost (BOM)

Industrial Production Cost (Estimated Batch of 50 Units)

• Pneumatic & PLC System Upgrade: Siemens S7-1200 PLC, Festo Pneumatics, Industrial Laser Micrometer, Heavy-Duty Cast Frame.
• Estimated Production Unit Cost: $\approx \text{₹}1,40,000 - \text{₹}1,80,000$ per unit [INFERENCE].
• Commercial Selling Price: Commercial lab preparation equipment sells for $\text{₹}3,50,000 - \text{₹}5,00,000$, making this a highly commercially viable solution [RESEARCHED].

22. Differentiation

23. Future Scope

1. Multi-Standard Die Turret: Rotating tool head accommodating ASTM D412, ISO 37, and IS 10810 Part 7 dumbbell dies on a single automated press [INFERENCE].
2. Automated Thickness Laser Scanning: Real-time 3D laser profiling of stripped insulation sheath thickness prior to dumbbell punching to guarantee $0.8\text{mm} - 2.0\text{mm}$ compliance [INFERENCE].
3. Industry 4.0 & OPC-UA LIMS Integration: Direct machine-to-cloud connectivity streaming specimen preparation metadata straight into NABL laboratory information systems [INFERENCE].

24. Assumptions & Open Items Log

Consolidated Log of Assumptions & Needs Validation

• [ASSUMPTION] System frame size constrained to $800 \times 600 \times 600 \text{ mm}$ workbench footprint.
• [ASSUMPTION] Hackathon prototype built using microcontroller (STM32/ESP32) and high-torque steppers, while production model uses Siemens PLC.
• [ASSUMPTION] Macro vision system dataset requires ~500 images for post-cut quality validation.
• [NEEDS VALIDATION] Exact radial blade plunge pressure required for aged XLPE sheaths versus fresh polymer batches.
• [NEEDS VALIDATION] Specific hardness tolerances for HDPE outer sheaths on 33kV armored cables to determine maximum clamping torque.

Final Recommendation

The team should proceed with building Approach 2 (Microcontroller-Driven Motorized Benchtop Automated Preparation System). It directly addresses every requirement in problem statement SIH26030, fulfills strict IS 10810 and IS 7098 standards, remains fully achievable within student hackathon budget/time constraints, and offers a clear path to commercial deployment [INFERENCE].

Recommended Stack

• Controller: STM32F407VGT6 / ESP32-S3 [INFERENCE]
• Display: 7-inch Nextion Capacitive Touch HMI [INFERENCE]
• Actuators: NEMA 23 Stepper Motors + TMC2209 Drivers + Linear Lead-Screws [INFERENCE]
• Sensing: Optical Laser Thru-Beam Diameter Sensor + End-stop Limit Switches [INFERENCE]
• Cutting/Punching: Tungsten Carbide Circular Blade + D2 Tool Steel IS 10810 Pt 7 Dumbbell Die [RESEARCHED]
• Frame: 2040 T-Slot Aluminum Profile + 4mm Transparent Polycarbonate Window [INFERENCE]

Biggest Dependency

Acquisition and precision machining of the standard IS 10810 Part 7 D2 Tool Steel Dumbbell Punching Die [RESEARCHED].

Biggest Risk

Blade drag or scoring on internal conductors when slitting thin-walled XLPE insulation if clamping alignment flexes [INFERENCE].

Biggest Technical Challenge

Implementing closed-loop dynamic blade depth control based on real-time diameter sensor input with sub-0.05mm positioning accuracy [INFERENCE].

First 5 Actions

1. Digitize exact geometric specs and tolerances for IS 10810 Parts 2, 7, and 33 [RESEARCHED].
2. Procure a standard IS 10810 Part 7 steel dumbbell die and tungsten carbide slitting blades [RESEARCHED].
3. Design 3D CAD model of self-centering V-clamp and motorized feed mechanism in Fusion360 [INFERENCE].
4. Wire laser diameter sensor to microcontroller and calibrate millimeter distance readings [INFERENCE].
5. Develop motor homing state machine firmware and test slitting depth accuracy on sample LT PVC cables [INFERENCE].

Validation Before Coding

• Verify laser diameter sensor accuracy on known calibration rods ($\pm 0.02\text{mm}$) [INFERENCE].
• Perform manual test cuts on XLPE sheath material to establish required blade plunge depth equations [INFERENCE].

Buildability Score /100

88 / 100 (High mechanical feasibility using standard modular extrusions, steppers, linear rails, and standard microcontroller/HMI hardware) [INFERENCE].

Confidence

High (92%) - System design is grounded directly in established physical metrology practices and standard cable testing guidelines [INFERENCE].

Research Sources

1. Bureau of Indian Standards (BIS) LIMS Testing Scope & Charges
   • URL: https://lims.bis.gov.in
   • Source Type: Official Government Standards Portal
   • Supported Claim: Testing charges and specifications for IS 10810 Part 2, Part 7, Part 33, and IS 7098 Part 1 & 2.
   • Reliability: Official Government Source [1.3].
2. IS 10810 (Part 7): Methods of Test for Cables - Tensile Strength & Elongation at Break
   • URL: https://archive.org/details/gov.in.is.10810.7.1984
   • Source Type: Published Standard Document
   • Supported Claim: Dumbbell specimen dimensions (75mm total length, 4mm narrow width), 0.8mm–2.0mm thickness, 20mm/50mm marker lines, and tubular sample options.
   • Reliability: Official Standard [4.1].
3. IS 10810 (Part 2): Methods of Test for Cables - Tensile Test for Aluminium Wires
   • URL: https://archive.org/details/gov.in.is.10810.2.1984
   • Source Type: Published Standard Document
   • Supported Claim: Conductor tensile sample preparation require 250mm gauge length straight wire samples without surface scoring.
   • Reliability: Official Standard [3.10].
4. Tata Power Technical Specifications for HT Cables (IS 7098 Part 2 Compliance)
   • URL: https://www.tatapower.com
   • Source Type: Industry Technical Standard / Public Procurement
   • Supported Claim: Cable specification requirements for XLPE insulated cables under IS 7098 Part 2.
   • Reliability: Reputable Industry Source [1.5].
5. Maxwell India & RedQubit Specimen Preparation Equipment Catalogs
   • URL: https://maxwellindia.com / https://redqubitsolutions.com
   • Source Type: Commercial Equipment Documentation
   • Supported Claim: Existing manual dumbbell cutting dies and cable slicing apparatus specifications.
   • Reliability: Commercial Manufacturer [1.3, 1.8].