wooden pins for bivouac tents

IS 6643: Scope Summary with Key Specifications

• Scope: Covers material, workmanship, and sampling requirements for timber pins, updated to reflect industry developments.
• Material & Workmanship: Refer to IS 707-1976 for timber definitions and quality.
• Sampling: Sampling of pins must follow IS 4905-1968 to ensure representative quality assessment.

Sampling Table (Table 1: Scale of Sampling & Permissible Defectives)

Additional Notes:

• Rounding: Test results should be rounded per IS 2-1960, matching the significant figures of specified values.
• Tolerances: Permissible tolerances are given in Fig. 1; otherwise, normal manufacturing tolerances apply.

This ensures quality control and conformity in timber pin manufacturing and testing.

IS 6643 - Definitions and Key Specifications

• Reference for Definitions:
  All definitions in IS 6643 refer to IS 707-1976. Consult IS 707 for precise terminology related to this standard.

• Rounding Off:
  Test results must be rounded off as per IS 2-1960, retaining the same number of significant figures as the specified value.

• Sampling and Lot Acceptance (Clause 3.3):

  • Lot is accepted if defective pins ≤ acceptance number in Table B-3 (Selection of Samples for Further Tests).
  • Otherwise, the lot is rejected.

• Units (SI Units) Used:

  Quantity	Unit	Symbol	Definition/Relation
  Length	metre	m
  Mass	kilogram	kg
  Time	second	s
  Force	newton	N	1 N = 1 kg·m/s²
  Pressure, stress	pascal	Pa	1 Pa = 1 N/m²
  Energy	joule	J	1 J = 1 N·m
  Power	watt	W	1 W = 1 J/s
  Electric current	ampere	A
  Thermodynamic temp.	kelvin	K

• Key Notes:

  • Botanical names updated in Appendix A.
  • Material and workmanship requirements revised.

flowchart LR
    A[IS 6643 Definitions] --> B[Refer IS 707-1976]
    A --> C[Rounding off: IS 2-1960]
    A --> D[Sampling & Acceptance: Clause 3.3]
    A --> E[SI Units Table]

Summary: For definitions, refer IS 707-1976; use IS 2 for rounding; sampling acceptance per Table B-3; SI units standardize measurements.

IS 6643: Materials - Key Specifications and Tables

1. Material Requirements

• Wooden pins must conform to quality and workmanship standards specified.
• Botanical names for timber are aligned with Appendix A.
• Sampling and testing procedures ensure lot conformity (Clause 3.3).

2. Sampling Table (Clause 3.3)

• Lot acceptance depends on the number of defective pins not exceeding limits in Table B-3.
• Example: If defective pins ≤ allowed number in column 5, lot is accepted; else rejected.

3. Tolerances (Clause 5.2)

• Permissible dimensional tolerances are illustrated in Fig. 1 (not provided here).
• If not specified, normal manufacturing tolerances apply.

4. Units (SI Units)

5. Rounding Off (Clause 0.3)

• Follow IS 2-1960 for rounding test results.
• Retain the same significant figures as specified.

flowchart LR
    A[Lot of Wooden Pins] --> B{Number of Defective Pins ≤ Limit?}
    B -- Yes --> C[Lot Accepted]
    B -- No --> D[Lot Rejected]

Summary: IS 6643 emphasizes material quality, sampling for defect control, dimensional tolerances, and standardized units for wooden pins used in bivouac tents.

IS 6643 - Design and Construction: Key Points

1. Tolerances (Clause 5.2)

• Permissible dimensional tolerances are specified in Fig. 1 of the standard.
• Where not specified, normal manufacturing tolerances apply.
• Ensures uniformity and interchangeability in wooden pins for bivouac tents.

2. Workmanship and Finish (Clause 6)

• Quality workmanship is mandatory for durability and fit.
• Surface finish must be smooth to avoid splinters and ensure ease of use.

3. Material and Sampling (Clause 2.1)

• Definitions and material specifications align with IS 707:1976 (Timber Technology).
• Botanical names and material properties updated as per Appendix A.
• Sampling and testing follow standard procedures for quality assurance.

4. Rounding Off (Clause 0.3)

• Test results must be rounded according to IS 2:1960.
• Maintain the same number of significant digits as specified values.

Typical Specifications Summary for Wooden Pins:

Diagram: Tolerance Zones (Conceptual)

graph LR
A[Nominal Dimension] --> B[Upper Tolerance Limit]
A --> C[Lower Tolerance Limit]
B -. Manufacturing Variations .-> D[Permissible Range]
C -. Manufacturing Variations .-> D

Summary:
IS 6643 emphasizes strict tolerances, quality workmanship, and material standards referencing IS 707 for wooden pins used in bivouac tents. Always check Fig. 1 for exact tolerance values and ensure compliance with rounding and sampling clauses.

IS 6643 - Wooden Pins for Bivouac Tents: Dimensions & Tolerances

Key Specifications:

• Hole Diameter:

  • A 3 mm diameter hole must be drilled at the center of each pin (Clause 4.2, Fig. 1) for easy handling.

• Dimensions:

  • Pins must conform to the exact dimensions shown in Fig. 1 (Clause 5.1).
  • Typical dimensions include length and diameter as per the standard drawing.

• Tolerances:

  • Permissible tolerances are specified in Fig. 1 (Clause 5.2).
  • Where not specified, normal manufacturing tolerances apply.

General Notes:

• Follow normal rounding rules for numerical values.
• Workmanship should ensure smooth finish and no cracks (Clause 6).

Typical Dimensions & Tolerances Table (Example):

(Refer to Fig. 1 in IS 6643 for exact values)

graph LR
A[Wooden Pin] --> B[Length]
A --> C[Diameter]
A --> D[3 mm Hole at Center]
B --> E[Tolerance ±1 mm]
C --> F[Tolerance ±0.5 mm]
D --> G[Tolerance ±0.1 mm]

For precise dimensions, always consult Fig. 1 of IS 6643.

IS 6643: Workmanship and Finish – Key Points

1. Tolerances (Clause 5.2)

• Permissible dimensional tolerances are specified in Fig. 1 of the standard.
• Where not specified, normal manufacturing tolerances apply.

2. Workmanship (Clause 6.1 & 2.1)

• Pins must be neatly made with a reasonably smooth finish all over.
• Inspection includes checking for:
  • Shape
  • Workmanship quality
  • Finish
  • Visual defects

3. Sampling and Compliance (Clause 0.2.1 & 0.3)

• Sampling procedures are included for quality control.
• Test results must be rounded off per IS 2:1960 rules, maintaining the same number of significant digits as specified.

Summary Table: Workmanship Requirements

flowchart TD
    A[Select Pins] --> B[Inspect Shape & Workmanship]
    B --> C{Defects?}
    C -- No --> D[Check Finish Smoothness]
    C -- Yes --> E[Reject or Rework]
    D --> F[Measure Dimensions]
    F --> G{Within Tolerance?}
    G -- Yes --> H[Accept]
    G -- No --> E

This ensures quality pins with proper shape and finish per IS 6643.

IS 6643: Sampling and Criteria for Conformity

Sampling Procedure (Clause B-1.1, B-1.3)

• Sampling must follow IS 4905:1968 random sampling methods.
• Samples are drawn per Table 1 based on lot size.
• Each lot is tested separately.

Table 1: Scale of Sampling and Permissible Defectives

Criteria for Conformity (Clause B-2.2)

• Lot acceptance: Defective pins ≤ permissible number (Col 3).
• Lot rejection: Defective pins > permissible number.

Summary:

• Draw sample size as per Table 1.
• Count defectives in the sample.
• Accept or reject lot based on permissible defectives.

flowchart TD
    A[Start: Lot of pins] --> B[Draw sample as per Table 1]
    B --> C{Count defective pins}
    C -->|Defectives ≤ Permissible| D[Accept Lot]
    C -->|Defectives > Permissible| E[Reject Lot]

This ensures quality control by statistically validating pin conformity per IS 6643.

IS 6643 – Marking of Wooden Pins for Bivouac Tents

Key Specifications (Clause 8.1, 8.1.1)

• Mandatory Marking:

  • Each pin shall be legibly and indelibly marked with:
    • Manufacturer's name or recognized trade-mark
    • Year of manufacture

• Standard Mark:

  • Pins may also bear the BIS Standard Mark as per BIS Act 1986.
  • Indicates compliance with inspection, testing, and quality control by BIS.
  • Use governed by BIS licensing conditions.

Standard Trade Names & Botanical Names (Clause 3.1)

Rounding Off Numerical Values (IS 2-1960)

• Final test values rounded off to the same number of significant figures as the specified value.
• Ensures consistency in reporting test results.

flowchart LR

IS 6643: Approved Timber Species for Pins

Key Specifications:

• Timber Species: As per Appendix A (Clause 3.1), pins must be made from the following species:

Quality Requirements (Clause 3.2):

• Moisture Content: ≤ 20%
• Grain Inclination: ≤ 1 in 20
• Defects: No sapwood, pith, decay, insect attack, knots, wrap, checks, cracks, or splits (except hair splits).

Testing (Clause B-3.2):

• Pins must be tested for:
  • Dimensions
  • Moisture content
  • Timber species confirmation

Marking (Clause 8.1.1):

• Pins may bear the Standard Mark ensuring compliance and quality control under BIS supervision.

flowchart TD
    A[Select Timber Species] --> B

IS 6643: Sampling Procedures & Conformity Criteria

1. Sampling Procedure (Clause B-1)

• Sampling is done per IS 4905:1968 random sampling methods.
• Samples drawn as per Table 1 based on lot size.

2. Table 1: Scale of Sampling & Permissible Defectives

3. Conformity Criteria (Clause B-2)

• Lot accepted if defective pins ≤ permissible number (Col 3).
• Otherwise, lot rejected.

4. Additional Notes

• Further tests use sub-samples as per Clause B-3.
• Sampling ensures representativeness and quality control.

flowchart TD
    A[Lot of Pins] --> B[Draw Sample (Table 1)]
    B --> C{Defective Pins ≤ Permissible?}
    C -- Yes --> D[Lot Accepted]
    C -- No --> E[Lot Rejected]
    D --> F[Sub-sample for Further Tests]

Summary: Use Table 1 to determine sample size and defect limits; accept lot if defectives are within limits per IS 6643.