Tool Mcleod for fighting forest fires

IS 12805: Scope & Sampling Specifications

Scope Summary:

• Covers Tool McLeod used for constructing fire lines in forest fire fighting.
• Specifies dimensions, tolerances, and quality control for manufacturing and procurement.
• Ensures tools are suitable for deep puff, pine-needled light bush, and grass terrain.

Key Sampling Table (Clause 7.1.1):

• Sampling is for lots produced under a quality control system.
• Ensures consistent product quality by testing representative samples.

Additional Notes:

• Dimensions and tolerances for blade and handle are detailed in Fig. 1 (not provided here).
• Final test values must be rounded per IS 2:1960 rules.
• BIS holds copyright; reproduction requires permission except for implementation use.

flowchart TD
    A[Manufacturing Lot] --> B{Lot Size?}
    B -->|<= 25| C[Sample 3 Items]
    B -->|26 to 50| D[Sample 5 Items]
    B -->|51 to 100| E[Sample 6 Items]
    C --> F[Quality Test]
    D --> F
    E --> F
    F --> G{Pass?}
    G -->|Yes| H[Accept Lot]
    G -->|No| I[Reject Lot]

This sampling approach ensures quality compliance for forest fire fighting tools as per IS 12805.

IS 12805 - Material Requirements: Key Points

Sampling & Testing (Clauses 7.1, 7.1.2.1 - 7.1.2.3)

• Sampling from Lots:
  • Samples are taken randomly from each lot to verify conformity.
  • Number of samples depends on lot size (Table 1):

• Testing:
  • Visual examination for requirements in Clauses 3, 5, and 6.
  • If no manufacturer certificate is available, test one item from each consignment individually.
  • All samples must pass for the lot to conform.

Summary:

• Lot size determines sample size (see table).
• Visual & physical tests ensure compliance.
• Manufacturer’s certificate can waive individual item testing.

This ensures quality control and material conformity per IS 12805 standards.

IS 12805: Dimensions and Tolerances Summary

• Dimensions & Tolerances for blade and handle are specified in Fig. 1 of the standard (all in mm).
• The handle must comply with IS 620 : 1985 requirements.
• Ferrule plate & ferrule dimensions are also given in Fig. 1.

Sampling Table for Quality Control (Clause 7.1.1)

Key Notes:

• Dimensions are in millimeters.
• Handle specifications per IS 620 ensure ergonomic and safety compliance.
• Tolerances ensure interchangeability and quality consistency.

For exact dimensions, refer to Fig. 1 in IS 12805 which details blade length, width, thickness, handle length, and ferrule sizes.

flowchart LR
    A[Blade Dimensions] --> B[Fig. 1 in IS 12805]
    C[Handle] --> D[Conforms to IS 620:1985]
    E[Ferrule & Plate] --> B
    F[Sampling] --> G[Table 7.1.1]

IS 12805: Blade Specifications Summary

1. Material Composition (Clause 3.1)

• Carbon: 0.83% to 1.04%
• Manganese: 0.30% to 0.50%
• Phosphorus: ≤ 0.40%
• Sulphur: ≤ 0.05%

2. Mechanical Properties

• Hardness (Rockwell C scale): 38 to 48

3. Blade Dimensions & Tolerances (Clause 4.1)

• Refer to Fig. 1 in IS 12805 for exact dimensions (all in mm).
• Blade and handle sizes are standardized to fit the socket.

4. Surface Finish (Clause 5.1)

• Cutting edge roughness: ≤ 0.4 µm (average)
• Cutting edge coated with light oil.
• Ferrule and ferrule plate must be painted or enamelled.

Typical Blade Dimension Table (Example from Fig. 1)

flowchart LR
    A[Steel Composition] --> B[Heat Treatment]
    B --> C[Hardness 38-48 HRC]
    C --> D[Grinding & Finishing]
    D --> E[Surface Roughness ≤ 0.4 µm]
    E --> F[Coating with Light Oil]

Note: Always cross-check Fig. 1 in IS 12805 for precise blade and handle dimensions to ensure compatibility with the socket and ferrule.

IS 12805 Handle Specifications Summary

• Handle Standard: As per IS 620:1985 (handles for tools).
• Dimensions & Tolerances: Refer to Fig. 1 in IS 12805 for exact blade and handle sizes (in mm).
• Ferrule & Ferrule Plate: Painted or enamelled for corrosion resistance.
• Cutting Edge Finish: Average roughness ≤ 0.4 µm; coated with light oil.
• Fit: Handle must suit the socket securely with specified tolerances.

Key Points from IS 620:1985 (Handle Requirements)

• Handles typically made from seasoned hardwood or approved synthetic materials.
• Length, diameter, and shape per tool type for ergonomic grip and strength.
• Tolerances ensure tight fit in socket to avoid loosening during use.

Typical Handle Dimensions (Example from IS 620)

flowchart LR
    A[Handle Material] --> B[Seasoned Hardwood / Synthetic]
    B --> C[Shape & Size per IS 620]
    C --> D[Fit in Socket with Tolerances]
    D --> E[Ferrule Plate Painted/Enamelled]
    E --> F[Cutting Edge Finish ≤ 0.4 µm Roughness]

For exact dimensions and tolerances, always consult Fig. 1 of IS 12805 and IS 620:1985.

IS 12805 - Finishing and Surface Treatment Key Points

1. Surface Finish Requirements (Clause 5.1)

• Cutting edge finish: Average roughness ≤ 0.4 μm.
• Ferrule and ferrule plate: Painted or enamelled for protection.
• Cutting edge coating: Light oil coating to prevent corrosion.

2. Sampling for Quality Control (Clause 7.1.2.2 & Table 1)

• Samples are taken randomly from each lot.
• Visual examination for compliance with requirements in Clauses 3, 5, and 6.
• All samples must pass for the lot to conform.

Summary:

• Ensure cutting edges are ground to ≤0.4 μm roughness.
• Protect ferrule components by painting/enamelling.
• Apply light oil coating on cutting edges.
• Follow sampling sizes for lot inspection as per Table 1.

flowchart LR
    A[Start: Manufacturing] --> B[Cutting Edge Grinding]
    B --> C{Roughness ≤ 0.4 μm?}
    C -- Yes --> D[Coat Cutting Edge with Light Oil]
    C -- No --> B
    D --> E[Paint/Enamel Ferrule & Plate]
    E --> F[Lot Sampling as per Table 1]
    F --> G{All Samples Pass?}
    G -- Yes --> H[Lot Approved]
    G -- No --> I[Reject Lot]

This ensures durability, corrosion resistance, and quality conformity per IS 12805.

IS 12805 - Marking Specifications (Clause 6.1):

• The tool shall be marked with:
  • Nominal mass (weight)
  • Manufacturer's initials
  • Recognized trade-mark

This marking ensures traceability and quality identification.

Sampling Table for Quality Control (Clause 7.1.1)

Summary:

• Marking is mandatory on tools for mass, manufacturer, and trademark.
• Sampling sizes are defined for lot inspection to ensure conformity.
• Dimensions and other details (e.g., ferrule plate) are in millimeters as per the code.

flowchart TD
    A[Tool Manufactured] --> B[Mark with Nominal Mass]
    A --> C[Mark Manufacturer's Initials]
    A --> D[Mark Trade-mark]
    E[Lot Produced] --> F[Check Lot Size]
    F -->|<=25| G[Sample 3 Items]
    F -->|26-50| H[Sample 5 Items]
    F -->|51-100| I[Sample 6 Items]

This ensures compliance with IS 12805 marking and sampling requirements.

IS 12805: Sampling and Criteria for Conformity

Sampling Procedure (Clause 7.1.2.1 & 7.1.2.2)

• Samples shall be taken randomly from each lot.
• Visual examination is done for requirements in Clauses 3, 5, and 6.
• All tested samples must pass for the lot to conform.

Sample Size Table (Table 1, Clause 7.1.2.2)

Criteria for Conformity (Clause 7.1.2.3)

• If no manufacturer’s certificate is available, one item per consignment is tested individually against specifications.

Summary:

• Random sampling based on lot size.
• Visual and specification checks on samples.
• All samples must pass for lot acceptance.
• Single-item testing if no manufacturer certificate.

flowchart TD
    A[Lot Received] --> B{Is Manufacturer's Certificate Available?}
    B -- Yes --> C[Take Samples as per Table 1]
    B -- No --> D[Test One Item per Consignment]
    C --> E[Visual & Specification Tests]
    D --> E
    E --> F{All Samples Pass?}
    F -- Yes --> G[Lot Accepted]
    F -- No --> H[Lot Rejected]

This ensures quality compliance per IS 12805.

IS 12805 - Lot Definition and Grouping Summary

Lot Definition (Clause 7.1.1)

• A lot consists of tools of the same type produced by the same manufacturer.
• Each lot is evaluated individually for quality.

Sampling for Quality Control (Clause 7.1.2 & Table 7.1.1)

• Samples are selected randomly.
• Visual examination covers requirements in Clauses 3, 5, and 6.
• All samples must pass for the lot to conform.

Key Points:

• Sampling size depends on lot size.
• Each lot is treated as a separate entity for quality evaluation.
• Sampling ensures representative quality check without testing every item.

flowchart TD
    A[Manufacturer] --> B[Lot: Same Tool Type]
    B --> C[Random Sample Selection]
    C --> D{Sample Size}
    D -->|Up to 25| E[3 Samples]
    D -->|26 to 50| F[5 Samples]
    D -->|51 to 100| G[6 Samples]
    E & F & G --> H[Visual & Specified Tests]
    H --> I{All Samples Pass?}
    I -->|Yes| J[Lot Accepted]
    I -->|No| K[Lot Rejected]

This ensures systematic quality control per IS 12805.

IS 12805 - Testing and Inspection Procedures: Key Points

Sampling for Lots (Clause 7.1.2.2)

• Samples are taken at random from each lot.
• Sample size depends on lot size as per Table 1:

• Samples undergo visual examination for requirements in Clauses 3, 5, and 6.
• All samples must pass for the lot to be accepted.

Additional Inspection (Clause 7.1.2.3)

• Without manufacturer’s conformity certificate, one item per consignment is tested individually.

Marking (Clause 6.1)

• Tools must be marked with:
  • Nominal mass
  • Manufacturer’s initials
  • Recognized trade-mark

Summary Flowchart of Sampling & Inspection

flowchart TD
    A[Start: Lot Received] --> B{Is Manufacturer's Certificate Available?}
    B -- Yes --> C[Select Samples as per Table 1]
    B -- No --> D[Select 1 item per consignment]
    C --> E[Visual & Specification Tests]
    D --> E
    E --> F{Do All Samples Pass?}
    F -- Yes --> G[Lot Accepted]
    F -- No --> H[Lot Rejected]

This ensures quality control via systematic sampling and inspection aligned with IS 12805 standards.