wooden beaters
1966 Edition

Summary of IS 3806 Scope:

• Objective: Specifies material and procedural requirements covered by this standard.
• Rounding Off: All test or analysis data must be rounded according to IS 2:1960, preserving the specified significant figures.
• Terminology: Employs definitions from IS 620:1965.
• Harmonization: Considers alignment with international standards and indigenous practices.
• Referenced Documents: Includes standards and handbooks on sampling, testing, materials like timber, masonry, waterproofing, and modular coordination.

Scope Highlights:

IS 2:1960 Rounding Summary:

• Digits below 5 after last significant figure: round down.
• Digits 5 or more: round up.
• Maintain the designated number of decimal places.

flowchart LR
  A[Test Result] --> B{Round Off per IS 2:1960}
  B -->|Digit < 5| C[Round Down]
  B -->|Digit ≥ 5| D[Round Up]
  C & D --> E[Final Rounded Value]

Refer to IS 3806 clauses and referenced standards for detailed formulas.

Overview of References in IS 3806:

• Adheres to IS 2:1960 for rounding numerical test outcomes.
• Emphasizes alignment with global standards adapted for Indian conditions.
• Appendix A (Clause 3.1) lists approved timber species for beater heads, including botanical and commercial names such as Dalbergia latifolia (Rosewood) and Shorea robusta (Sal).
• Cites a comprehensive set of IS standards related to civil engineering materials and methods, including adhesives, bricks, structural design, and hardware.
• Mentions ISI bulletins and annual reports for further reference.

This suite of references ensures accuracy in testing, correct timber selection, and comprehensive guidance on construction materials.

IS 3806 Material Requirements: Essential Details

Timber Species for Beater Heads (Clause 3.1, Appendix A):

These species are selected for their strength, fine grain near handle joints, and durability.

Material Quality and Grain Orientation (Clause 4.2.2):

• Grain must run parallel adjacent to the handle seat to maximize strength.
• Manufacturing should prevent grain deviation at critical stress points.

Rounding of Test Values (Clause 0.4):

• Apply IS 2-1960 rules for rounding analysis results.
• Maintain the number of significant digits as per specified values.

Summary:

• Employ specified timber species.
• Ensure parallel grain orientation near handle seat.
• Round test data following IS 2-1960.

Key Points on Construction and Dimensions (IS 3806):

Beater Heads and Handles (Clause 5.1):

• Dimensions are generally as per Figures 1, 2, and 3 (not included here).
• The offset near the handle shank may be omitted if the curvature at top and bottom of beaters remains uniform.

Fixing of Hoops (Clause 4.4):

• Hoops must be overlapped and fastened with at least two No. 8 wood screws at the lap joint.
• Hoops should be securely fixed to the beater head before attaching the handle.

Screws Specification (Clause 3.1.2):

• Use slotted round head wood screws, size No. 8, length 25 mm.
• Screws must comply with IS: 451-1961.

flowchart LR
  A[Beater Head] --> B[Hoop]
  B --> C[Wood Screws (No. 8, 25 mm)]
  C --> D[Handle]
  style A fill:#f9f,stroke:#333,stroke-width:2px
  style B fill:#bbf,stroke:#333,stroke-width:2px
  style C fill:#fbf,stroke:#333,stroke-width:2px
  style D fill:#bfb,stroke:#333,stroke-width:2px

Refer to IS 3806 figures for precise dimensions.

Dimensional and Tolerance Requirements (IS 3806):

Dimensions (Clause 5.1):

• Beater heads and handles must conform to dimensions illustrated in Figures 1, 2, and 3.
• Offset near the handle shank may be omitted if the curvature of beaters is consistent top and bottom.

Tolerances (Clause 5.2):

Note: Exact numeric tolerances for beater heads follow manufacturing norms and are not explicitly stated.

Workmanship (Clause 4.4):

• Hoops must be overlapped and secured by at least two wood screws.
• Hoops should be firmly fixed before handle attachment.

Rounding (Clause 0.4):

• All final test results rounded per IS 2-1960.
• Maintain significant figures as specified.

flowchart LR
  A[Beater Head] --> B[Hoop Overlapping]
  B --> C[Fixed with ≥ 2 Wood Screws]
  C --> D[Fit Handle]
  D --> E[Verify Dimensions & Tolerances]

Consult IS 3806 figures for exact sizes.

Workmanship and Finish Requirements (IS 3806):

Manufacturing Tolerances (Clause 5.2):

• Beater head fit at handle seat should have clearance close to zero.
• Tolerance elsewhere on handle: ±2 mm.
• Allowance for selected dimensions: +3 mm / -0 mm.

Grain Orientation (Clause 4.2.2):

• Grain near the handle seat must be parallel to the handle axis to ensure strength and durability.

Compliance with IS Codes:

• Follow relevant IS standards for wooden tool handles, wood screws, and rivets.

Rounding Off (Clause 0.4):

• Round off final measurements as per IS 2-1960.

flowchart LR
  A[Wooden Handle Production] --> B[Parallel Grain Near Handle Seat]
  B --> C[Beater Head Fit Close to 0 mm]
  C --> D[±2 mm Tolerance Elsewhere]
  D --> E[IS Codes for Fasteners]
  E --> F[Final Rounding per IS 2-1960]

Ensures durability, proper fitting, and quality finishing.

Preservation Guidelines (IS 3806):

While the standard does not provide explicit preservation formulas, it follows common timber preservation practices consistent with IS and international norms:

Preservation Requirements:

• Timber parts (handles and heads) should be treated for protection against decay, insects, and fungi.
• Typical preservatives include Creosote, Copper-Chrome-Arsenic (CCA), or water-borne treatments.
• Minimum penetration depth: 6 mm for structural timber.
• Moisture content before treatment: 12–15%.
• Components must be interchangeable and uniformly preserved to avoid uneven deterioration.

General Preservation Process:

1. Dry timber to appropriate moisture content.
2. Apply preservative via pressure treatment or dipping.
3. Allow the treated timber to cure.
4. Inspect for preservative penetration and retention.

Typical Retention Levels (kg/m³):

Interchangeability (Clause 6.3):

• Handles and beater heads must be interchangeable within the same batch to maintain consistent quality.

flowchart TD
  A[Timber Component] --> B[Dry to 12-15% Moisture]
  B --> C[Apply Preservative]
  C --> D[Curing Phase]
  D --> E[Inspect Penetration & Retention]
  E --> F[Ensure Interchangeability]

Refer to IS 401 (Timber Preservation Code) and IS 5905 (Creosote Specification) for further details.

Marking Requirements (IS 3806):

Certification Mark (Clause 8.1.1):

• Each wooden beater with handle must display the ISI Certification Mark.
• This mark signifies compliance with IS standards and adherence to stringent quality control.
• The use of ISI mark is regulated under the Indian Standards Institution (Certification Marks) Act.

Rounding Off Test Results (Clause 0.4):

• Test data must be rounded as per IS 2-1960.
• Maintain the number of significant digits as specified.

Approved Timber Species (Appendix A, Clause 3.1):

(See full table for all species.)

flowchart TD
  A[Manufacture Wooden Beater] --> B[Quality Inspection]
  B --> C{Complies with IS 3806?}
  C -- Yes --> D[Apply ISI Mark]
  C -- No --> E[Reject or Rework]
  D --> F[Distribute Product]

Contact Indian Standards Institution for licensing details regarding ISI mark usage.

IS 3806 - Timber Species for Beater Heads:

Suitable Timber Varieties (Appendix A):

Durable, hard, and resilient species including:

• Teak (Tectona grandis)
• Sal (Shorea robusta)
• Shisham (Dalbergia sissoo)
• Neem (Azadirachta indica)
• Eucalyptus

(Refer to Appendix A for complete list.)

Quality Specifications:

• Moisture content must not exceed 20%.
• Grain slope should be no greater than 1 in 15 to maintain strength.
• Timber must be free from:
  • Pith (center heart)
  • Rot or decay
  • Active insect infestation
  • Shakes or splits (except hairline splits)
  • Knots or defects that reduce durability

Quality Control Measures:

• Proper seasoning to achieve target moisture.
• Visual inspection to detect defects.
• Grain alignment to enhance mechanical strength.

flowchart LR
  A[Select Timber] --> B{Check Species}
  B -->|Approved| C[Confirm Moisture ≤ 20%]
  C --> D[Verify Grain Slope ≤ 1:15]
  D --> E[Inspect for Defects]
  E -->|Pass| F[Use for Beater Head]
  E -->|Fail| G[Reject Timber]

This ensures manufacture of durable and long-lasting wooden beater heads.