willow logs for artificial limbs

IS 6707: Scope Summary

• Purpose: Specifies requirements for timber used in construction, referencing IS 707-1968 for definitions.
• Rounding off Values: As per IS 2-1960, test or analysis results must be rounded to the same significant figures as specified values.
• Surface Cracks: Surface cracks > 25 mm are not permissible (Clause 4.6).
• Dimensions & Measurement: Detailed in the Timber Sectional Committee BDC 9; dimensions must comply with standard tolerances.

Key Points:

No direct formulas or tables are specified under "Scope" in IS 6707; refer to detailed clauses for design and testing methods.

IS 6707 - Definitions & Key Specifications

• Definitions: As per Clause 2.1, definitions are adopted from IS 707:1968 (General specifications for timber), which covers terms related to timber quality, defects, and grading.

• Measurement & Rounding (Clause 0.4):

  • Final test or analysis results must be rounded as per IS 2:1960.
  • Retain the same number of significant figures as the specified value.

• Defects (Clauses 4.1 to 4.6):

  • Permissible defects are detailed in 4.2 to 4.6.
  • Measurement methods follow IS 3364:1965.
  • Surface cracks > 25 mm are not allowed (Clause 4.6).

Summary Table: Crack Length Limits

Reference Standards for Definitions & Measurements

flowchart LR
    A[IS 6707 Definitions] --> B[IS 707:1968 Definitions]
    A --> C[Defect Limits]
    C --> D[Surface cracks ≤ 25 mm]
    A --> E[Measurement Methods]
    E --> F[IS 3364:1965]
    A --> G[Rounding Rules]
    G --> H[IS 2:1960]

This ensures uniformity in terminology, measurement, and quality control for timber as per IS 6707.

IS 6707 - General Requirements Summary

• Definitions: Refer to IS 707-1968 for all relevant terms.

• Surface Cracks (Clause 4.6):

  • Surface cracks > 25 mm in any portion are not permitted.

• Measurement & Rounding (Clause 0.4):

  • Final test or analysis values must be rounded as per IS 2-1960.
  • Retain the same number of significant digits as the specified value.

Key Specifications:

Rounding Example (IS 2-1960):

If you need formulas or detailed dimension tables, please specify the element type (e.g., beams, columns).

IS 6707: Quality and Defects in Timber Logs

Key Specifications:

• Permissible Defects: As per Clauses 4.2 to 4.6, defects like knots, shakes, cracks, decay, insect attack are regulated.
• Defect Measurement: Follow IS 3364:1965 for measuring defects.
• Prohibited Defects: Logs must be free from:
  • Brashness
  • Dead/loose knots
  • Wounds
  • Cup shakes
  • Decay
  • Insect attack
    Plugging of defects is not allowed (Clause 3.1).

Critical Limits:

• Surface cracks > 25 mm at any portion are not permissible (Clause 4.6).

Rounding Off:

• Numerical results must be rounded as per IS 2:1960.
• Retain the same number of significant digits as specified.

Summary Table: Defect Limits

This ensures timber quality aligns with IS standards for structural safety and durability.

IS 6707: Dimensions and Measurement Key Points

• Length Measurement (Clause 5.2.1):

  • Measured in metres.
  • Rounded down to the nearest 0.05 m.

• Girth Measurement (Clause 5.2.2):

  • Measured in centimetres.
  • Rounded down to the nearest 1 cm.

• Surface Cracks (Clause 4.6):

  • Cracks > 25 mm anywhere on the log are not permissible.

• Rounding Off (Clause 0.4):

  • Final values (test or analysis) rounded as per IS 2-1960.
  • Retain the same number of significant figures as specified.

• Defect Measurement (Clause 4.1):

  • Defects measured according to IS 3364-1965.

Summary Table

flowchart TD
    A[Log Measurement] --> B[Measure Length (m)]
    B --> C[Round down to nearest 0.05 m]
    A --> D[Measure Girth (cm)]
    D --> E[Round down to nearest 1 cm]
    A --> F[Check Surface Cracks]
    F --> G{Crack size ≤ 25 mm?}
    G -- Yes --> H[Log Acceptable]
    G -- No --> I[Log Rejected]

This ensures consistent measurement and quality control per IS 6707 standards.

IS 6707 - End Treatment Key Points

• Clause 6.1:

  • Immediately after inspection, log ends and exposed bark areas must be coated as per IS 1141:1972 (Code of Practice for Seasoning of Timber).
  • Optional: Further prophylactic treatment on ends can follow IS 401:1967 (Code of Practice for Preservation of Timber).

• End Splits (Clause 4.5):

  • Maximum longest end split at each end: ≤ 5 cm
  • Total length of longest end splits in 2.5 m log length: ≤ 12 cm

Summary Table

Additional Notes

• End treatment prevents moisture ingress and fungal attack during seasoning and storage.
• Use tar, paint, or specialized preservatives as coating materials per IS 1141.
• Prophylactic treatments may include chemical preservatives to enhance durability.

flowchart LR
    A[Log Inspection] --> B{End & Bark Exposed?}
    B -- Yes --> C[Apply Coating (IS 1141)]
    C --> D{Further Treatment Needed?}
    D -- Yes --> E[Apply Prophylactic Treatment (IS 401)]
    D -- No --> F[Store Logs]
    B -- No --> F

This ensures logs are protected from drying defects and biological deterioration.