wooden paddles

IS 6729: Scope - Key Specifications & Tables

• Scope: Specifies dimensions, tolerances, and materials for ordinary quality structural steel paddles.

Length & Tolerance

• Length of Paddle: Typically 1200 mm or 800 mm depending on design.
• Tolerance in length: ± 2 cm (Clause 6.1).

Cross-Section & Length Between Sections

(Alternate paddle dimensions also provided for 800 mm length with similar sectional details.)

Additional Notes

• Handle length: 775 mm, cross-section: 33 mm dia.
• Permissible defects and locking arrangement details are specified in Clause 1.6.
• Values rounded per IS:2-1960.

This ensures uniformity in paddle manufacture for structural steel applications.

flowchart LR
    A[Start: Paddle Design]
    A --> B{Select Length}
    B -->|1200 mm| C[Use Table 1 Sections]
    B -->|800 mm| D[Use Table 2 Sections]
    C --> E[Check Tolerance ±2 cm]
    D --> E
    E --> F[Verify Cross-Section Dimensions]
    F --> G[Confirm Defects per Clause 1.6]
    G --> H[Finalize Paddle]

IS 6729: Definitions & Key Specifications

• Reference for Definitions:
  Definitions are primarily as per IS 707:1968 (Glossary of terms for timber and timber products).

• Rounding Off Rules:
  Final test/calculated values must be rounded as per IS 2:1960.

  • Retain the same number of significant digits as the specified value.

• Paddle Dimensions & Tolerances (Clause 6.1):

  • Length of paddle: 1200 mm ± 20 mm
  • Cross-section sizes and lengths between sections:

• Material: Structural steel (ordinary quality) as per relevant IS specification.

Summary Diagram of Paddle Sections

graph LR
A[75×6] -->|100mm| B[140×15] -->|200mm| C[110×26.5] -->|188mm| D[76.5×33] -->|107mm| E[55×40] -->|155mm| F[28 dia] -->|225mm| G[28 dia] -->|225mm| H[75 dia]

This provides a clear overview of the paddle's sectional dimensions and spacing as per IS 6729.

IS 6729 - Materials: Key Specifications & Tables

1. Material Specification:

• Mild Steel for chain manufacture shall conform to IS: 1977-1969 (Clause 3.2).
• Structural steel used is ordinary quality (first revision).

2. Tolerances (Clause 6.1):

• Length tolerance of paddle: ± 2 cm.
• Typical paddle length: 1200 mm.

3. Paddle Cross-Section & Length Between Sections:

4. Handle Specifications:

• Handle length: 775 mm
• Cross-section: 33 mm dia

5. Rounding Off (Clause 0.4):

• Final test/analysis values rounded as per IS: 2-1960, maintaining significant figures.

Summary:

• Use mild steel IS 1977.
• Maintain paddle length 1200 mm ± 20 mm.
• Follow cross-section dimensions per table for structural integrity.
• Round off results per IS 2-1960 for compliance.

flowchart LR
    A[Paddle Length 1200 mm ± 20 mm] --> B[Cross-Section Dimensions]
    B --> C{Sections A to H}
    C -->|A| D[75×6 mm]
    C -->|B| E[140×15 mm]
    C -->|C| F[110×26.5 mm]
    C -->|D| G[76.5×33 mm]
    C -->|E| H[55×40 mm]
    C -->|F| I

IS 6729: Requirements of Blanks for Paddle Manufacture

1. Material Specification

• Mild steel for chains must conform to IS: 1977-1969 (Structural Steel Ordinary Quality).

2. Dimensions of Blanks (Clause 4.1)

• Blanks must allow normal woodworking to achieve final paddle shape in one piece.
• Length of paddle = 1200 mm with tolerance ± 20 mm (Clause 6.1).

3. Cross-Section & Length Between Sections

4. Defect Limitations (Clause 4.2)

• Moisture content ≤ 15%
• Grain inclination ≤ 1 in 20
• Free from: pin-holes, pith, sapwood, rot, insect attack, brashness, splits (except hair splits), cracks, hollow-heart, knots (except permitted ones).

Summary Diagram of Paddle Sections

graph LR
A[75×6] -->|100mm| B[140×15]
B -->|200mm| C[110×26.5]
C -->|188mm| D[76.5×33]
D -->|107mm| E[55×40]
E -->|155mm| F[28 dia]
F -->|225mm| G[28 dia]
G -->|225mm| H[75 dia]

This ensures blanks are dimensionally suitable and defect-free for quality paddles.

IS 6729 – Shape and Dimensions of Paddles

Key Specifications:

• Length of Paddle:

  • Typical length = 1200 mm (± 20 mm tolerance as per Clause 6.1)

• Cross-Section Dimensions & Length Between Sections (Example 1):

• Cross-Section Dimensions & Length Between Sections (Example 2):

Additional Notes:

• Handle Length: 775 mm with 33 mm diameter cross-section (MS tube).
• Material: Ordinary quality structural steel.
• Shape: Single or two-piece paddle as per Figures 1 & 2 (not shown here).
• Tolerances: ± 2 cm in length; other dimensional tolerances as per Clause 6.
• Blanks: Should allow normal wood working operations to final shape (Clause 4.1).

Summary Diagram (

IS 6729: Tolerances for Structural Steel Paddle

Key Tolerances (Clause 6.1 & 6.2)

Cross-Section Dimensions (Example)

Rounding Off (Clause None: 0.4)

• Values must be rounded as per IS: 2-1960.
• Retain the same significant digits as specified.

Summary

• Length tolerance: ± 20 mm ensures manufacturing precision.
• Diameter tolerance: ± 3 mm ensures proper shaft fit.
• Use the cross-section and length tables for design and quality checks.

flowchart LR
    A[Paddle Length] -->|± 20 mm| B[Manufacturing]
    C[Shaft Diameter] -->|± 3 mm| D[Fit & Assembly]
    B --> E[Quality Control]
    D --> E

This ensures dimensional compliance and functional reliability per IS 6729.

IS 6729: Permissible Defects in Finished Paddle

Key Points from Clause 7 (Permissible Defects)

• No defects other than those in Clauses 7.1.1 and 7.1.2 are allowed.
• Measurement of defects follows IS: 3364-1965.
• Defects like pin-holes, pith, sapwood, decay, insect attack, brashness, splits (except hair splits), cracks, hollow-heart, and knots are not permitted except as specified.

Moisture & Grain (Clause 4.2)

• Moisture content ≤ 15%.
• Grain inclination ≤ 1 in 20.

Tolerances (Clause 6.3)

• Width tolerance of working face at blade end: ±2 mm.

Dimensions Summary (from Clause 1.6 Table)

• Total paddle length: 800 mm
• Handle length: 775 mm, diameter 33 mm

Summary Table of Permissible Defects (Conceptual)

Key Specifications & Formulas for Finishing (IS 6729)

1. Dimensions & Tolerances

• Length of Paddle: 1200 mm ± 20 mm (Clause 6.1)
• Handle Length: 775 mm
• Cross-section dimensions vary along the paddle length (see tables below).

2. Cross-Section & Length Between Sections

3. Permissible Defects & Finishing Quality

• Follow Clause 1.6 for permissible defects (e.g., minor surface imperfections).
• Final dimensions and test results must be rounded per IS:2-1960 (Clause 0.4).

4. Woodworking Considerations

• Blanks must allow normal woodworking to achieve final shape in one piece (Clause 4.1).

Summary Diagram of Cross-Sectional Variation

graph LR
    A["75 × 6"] -->|100 mm| B["140 × 15"]
    B -->|200 mm| C["110 × 26.5"]
    C -->|188 mm| D["76.5 × 33"]
    D -->|107 mm| E["55 × 40"]
    E -->|155 mm| F["28 dia"]
    F -->|225 mm| G["28 dia"]
    G -->|225 mm| H["75 dia"]

Note: Use these dimensions and tolerances strictly for paddle finishing and quality control as per IS 6729.

IS 6729 - Key Specifications & Test Details

1. Rounding Off Results (Clause 0.4)

• Final test values must be rounded per IS:2-1960, retaining the same significant digits as the specified values.

2. Visible Damage Recording (Clause 9.1.1)

• Record chips, cracks, delamination, warping after each test using the pro forma in Appendix B.

3. Paddle Tolerances (Clause 6.1)

• Length tolerance: ± 2 cm for paddle length (nominal 1200 mm).

4. Paddle Cross-Section & Length Between Sections

5. Timber Species Suitable for Paddles (Appendix A)

• Examples: Teak (TEA), Sissoo (SIS), Ash (ASH), Gurjan (GUR), Benteak (BEN).

6. Test Sheet (Appendix B)

• Records moisture %, manufacturer, consignment no., test results for:
  • Drop Test
  • Immersion Test
  • Strength Test
  • Vibration Test
  • Impact Test

Summary Table for Test Recording (Appendix B)

IS 6729 - Marking of Paddles: Key Specifications

Clause 10.1 - Mandatory Markings on Each Paddle:

• Manufacturer's Identification Mark
• Month and Year of Manufacture
• Timber Species Symbol (Refer Appendix A for species abbreviations)

Appendix A - Timber Species Symbols:

Clause 10.1.1 - Optional Marking:

• ISI Certification Mark (subject to ISI licensing and quality control)

Additional Notes:

• Length tolerance of paddle: ± 20 mm (Clause 6.1)
• Markings must be legible and indelible.

Summary Table for Marking:

flowchart TD
    A[Paddle] --> B[Mark Manufacturer ID]
    A --> C[Mark Month & Year]
    A --> D[Mark Timber Species Symbol]
    A --> E{Optional}
    E --> F[ISI Certification Mark]

This ensures traceability, quality assurance, and compliance with IS standards.

IS 6729: Timber Species Suitable for Paddles

Key Specifications from IS 6729:

• Timber Species (Clause 3.1 & Appendix A):
  Suitable species are those with:

  • High strength
  • Shock resistance
  • Light weight
  • Low moisture absorption
  • Buoyancy

  Refer to Appendix A of IS 6729 for the list of recommended species. Common examples:

  • Teak
  • Sal
  • Mango
  • Shisham

• Moisture Content (Clause 4.2):

  • Maximum moisture content: 15%
  • Well-seasoned timber is mandatory.

• Grain Inclination:

  • Should not exceed 1 in 20 (approx. 3° deviation).

• Defects Not Allowed:

  • Pin-holes, pith, sapwood, decay, insect attack, brashness, splits (except hair splits), cracks, hollow-heart, and knots (except permitted under Clause 7).

Summary Table: Timber Selection Criteria for Paddles

Additional Notes:

• The timber must be buoyant to ensure paddles float if dropped.
• Seasoning improves strength and reduces moisture absorption.

flowchart TD
    A[Select Timber Species] --> B{Check Properties}
    B -->|High Strength| C[Pass]
    B -->|Shock Resistant| C
    B -->|Light Weight| C
    B -->|Low Moisture Absorption| C
    B -->|Buoyant| C
    C --> D[Check Moisture Content ≤15%]
    D --> E[Check Grain Inclination ≤1:20]
    E --> F[Inspect for Defects]
    F --> G{Accept if No Defects}

For detailed species list and dimensional specs, refer to Appendix A and other relevant clauses of IS 6729.

IS 6729: Test Sheet & Key Specifications for Paddle Testing

1. Paddle Dimensions & Tolerances (Clause 6.1)

• Length: 1200 mm ± 20 mm (± 2 cm)
• Cross-Sections & Lengths:

2. Test Sheet for Recording Results (Appendix B, Clause 9.1.1)

3. Test Descriptions

• Vibration Test (9.5):
  Paddle held as cantilever; blade pressed down by L/15 and suddenly released.

• Impact Test (9.6):
  Paddle held as cantilever;