This standard outlines the specifications for timber half-wrought used in crafting sporting rifles and double bore shotguns. It details dimensions, allowable deviations, material quality, permissible defects, seasoning, and marking requirements to guarantee the timber’s strength, durability, and fitness for firearm parts. It is a vital guideline for manufacturers, suppliers, and inspectors involved in producing wooden components for sporting firearms.
Overview
This standard outlines the specifications for timber half-wrought used in crafting sporting rifles and double bore shotguns. It details dimensions, allowable deviations, material quality, permissible defects, seasoning, and marking requirements to guarantee the timber’s strength, durability, and fitness for firearm parts. It is a vital guideline for manufacturers, suppliers, and inspectors involved in producing wooden components for sporting firearms.
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Frequently Asked
IS 7549 defines the requirements for timber half-wrought applied in sporting rifles with typical thickness ranging from 12 to 20 mm, widths between 60 and 120 mm, and lengths generally from 600 to 900 mm depending on rifle design. The allowable tolerance for thickness and width is ±0.5 mm to ensure proper fitting and machining allowances. Timber must possess straight grain, be free from defects such as knots and cracks, and have moisture content maintained between 8% and 12% to prevent deformation. Since IS 7549 does not specify exact dimensional tables, manufacturers should align with these typical ranges and ensure compliance with timber quality standards.
Under IS 7549, only sapwood is permitted as a defect, provided it does not exceed 20% of the surface area and is sound without decay or damage. This sapwood must be prophylactically treated by dipping in and out of a 10% copper naphthenate solution dissolved in white spirit or an appropriate organic solvent. Other defects such as center-heart, rot, knots (dead or live), checks, splits, borer holes, and warp are not allowed. Additionally, plugging or repairing defects is strictly prohibited to maintain timber integrity.
According to IS 7549, timber must be properly seasoned to achieve a moisture content not exceeding 20%. The grain slope should not be steeper than 1 in 15, and the timber must be free from defects including pith, decay, knots, splits, borer holes, and warping, except those explicitly permitted. Growth rings should range between 3 and 8 per centimeter, and the density at 12% moisture content must be at least 510 kg/m³. These criteria ensure the timber’s structural soundness and longevity for firearm applications.
Sapwood, when present up to 20% of the surface area in half-wrought timber, must be sound and undergo prophylactic treatment. This treatment consists of a dip in-dip out process using a 10% copper naphthenate solution in white spirit or a suitable organic solvent. This procedure protects the timber from decay and insect attack, ensuring durability consistent with IS 7549. Additionally, moisture content should be maintained below 20%, and other defects are not permitted.
Each approved timber half-wrought piece must be clearly and permanently marked with the manufacturer's name or trade-mark, the year of manufacture, and the species of timber as classified under IS 7549. Optionally, the ISI Certification Mark may be applied if the manufacturer holds the relevant license and complies with quality control regulations. These markings facilitate traceability, quality assurance, and conformity to the standard.
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