The standard outlines specifications for willow logs (Salix species) intended for use in the fabrication of artificial limbs. It details criteria for quality, size, allowable imperfections, and preservation treatments to guarantee the timber's suitability in prosthetic manufacturing. This guideline is vital for producers, vendors, and inspectors engaged in supplying willow timber for prosthetic purposes.
Overview
The standard outlines specifications for willow logs (Salix species) intended for use in the fabrication of artificial limbs. It details criteria for quality, size, allowable imperfections, and preservation treatments to guarantee the timber's suitability in prosthetic manufacturing. This guideline is vital for producers, vendors, and inspectors engaged in supplying willow timber for prosthetic purposes.
Audience
Contents
Structure
This section defines the intended use of willow logs for prosthetic limbs, referencing IS 707-1968 for timber terminology. It specifies that surface cracks exceeding 25 mm are unacceptable and that measurement tolerances must align with timber standards. Numerical values must be rounded according to IS 2-1960 to maintain consistency.
Terms used in this standard are adopted from IS 707:1968, covering timber quality and defects. Measurements and rounding follow IS 2:1960 rules, while defect measurements comply with IS 3364:1965. Surface cracks over 25 mm are prohibited.
Willow logs must not have surface cracks longer than 25 mm. All test results should be rounded to the same number of significant figures as the specified values, per IS 2-1960. Definitions are consistent with IS 707-1968.
Defects such as knots, shakes, cracks, decay, and insect damage are strictly controlled. Logs must be free from brashness, dead or loose knots, wounds, cup shakes, decay, and insect infestation. Filling or plugging of defects is forbidden to ensure the integrity of the timber.
Length is measured in metres and rounded down to the nearest 0.05 m, while girth is measured in centimetres and rounded down to the nearest 1 cm. Surface cracks larger than 25 mm are not allowed. Measurements and defect assessments follow IS 3364:1965.
Immediately after inspection, log ends and exposed bark must be coated in accordance with IS 1141:1972 to prevent moisture and fungal damage. Optional preservative treatments following IS 401:1967 may be applied. End splits must not exceed specified length limits to maintain quality.
Frequently Asked
According to IS 6707 (1972), willow logs must be free from any defects including brashness, dead or loose knots, wounds, cup shakes, decay, and insect damage. Plugging or filling defects is strictly prohibited to ensure the logs maintain structural soundness required for prosthetic applications.
Length measurement depends on the ends: if the ends are parallel, measure from end to end; if not, measure the shortest distance between the end and the slot. Length is recorded in metres, rounded down to the nearest 0.05 m, with a minimum length of 1.5 m. Girth is measured on both sides of any mid-length protrusion, averaged, and rounded down to the nearest centimetre, with a minimum girth of 55 cm.
IS 6707 recommends that immediately after inspection, the ends and exposed bark of willow logs be coated following IS 1141:1972 to prevent moisture penetration and fungal growth during seasoning. Additional preservative treatment as per IS 401:1967 may be optionally applied to enhance protection against pests and decay.
No, IS 6707 explicitly prohibits plugging or repairing defects in willow logs. Logs must be free from defects like brashness, dead or loose knots, wounds, cup shakes, decay, and insect attack to preserve the quality and strength essential for artificial limb manufacturing.
The volume (V) of a willow log is calculated by the formula: V = (G² / 4π) × L, where G is the girth in metres and L is the length in metres. This formula treats the log as a cylinder, deriving diameter from the girth (Diameter = G/π) and calculating cross-sectional area (A = G² / 4π), with volume being area multiplied by length.
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