The 1985 edition outlines the fundamental specifications for wooden handles used in various hand tools across India. It details classifications, appropriate timber types, size and tolerance criteria, workmanship standards, allowable imperfections, testing protocols, and marking guidelines. This standard serves as a critical reference for producers, inspectors, and engineers to guarantee the quality, safety, and effectiveness of wooden tool handles.
Overview
The 1985 edition outlines the fundamental specifications for wooden handles used in various hand tools across India. It details classifications, appropriate timber types, size and tolerance criteria, workmanship standards, allowable imperfections, testing protocols, and marking guidelines. This standard serves as a critical reference for producers, inspectors, and engineers to guarantee the quality, safety, and effectiveness of wooden tool handles.
Audience
Contents
Structure
This section defines the applicability of the standard to wooden handles crafted from indigenous timbers, outlining the quality control sampling and testing procedures referenced from IS 707-1976. It includes detailed lot sampling sizes and permissible defect counts, along with dimensional tolerance ranges for fitting regions and overall lengths. Timber suitability is elaborated with species listings and suitability coefficients to ensure consistent quality across production batches.
Definitions conform to IS 707-1976 along with additional terms specific to wooden handles. Sampling requirements are specified based on lot sizes with strict limits on allowable defective units. The criteria for lot acceptance depend on these sampling results, complemented by tests measuring dimensions, moisture, and performance to maintain standards.
Tool handles are classified primarily by tool function and maximum length, distinguishing between light striking tools, scooping implements, and cutting/shaping instruments. The suitability of timber is assessed via mechanical properties such as shock resistance and hardness. Dimensions must align with relevant Indian Standards, ensuring compatibility and safety.
This segment specifies timber species suitable for each handle class, providing their comparative suitability coefficients relative to axlewood. It details species recommended for light striking, scooping, and cutting/shaping tools, emphasizing the selection of wood that combines strength and resilience for specific tool applications.
Requirements focus on moisture content control between 8% and 15%, exclusion of critical defects such as pith or rot, and adherence to timber identification standards. Post-manufacture treatments include initial dips in raw linseed oil at ambient temperature and subsequent hot oil soaking to enhance moisture stability and durability.
Handles must meet predetermined dimensions with tolerances of +3 mm at critical fitting points and ±2 mm elsewhere. These tolerances ensure proper assembly and usability while accommodating manufacturing variations. Seasonal treatment and oil application are also emphasized to maintain dimensional stability.
Handles should exhibit good workmanship with an adequate finish for durability. Detailed permissible defect limits, including grain deviation and knot allowances, are provided along with sampling and inspection procedures to ensure consistent quality across production lots.
The standard delineates specific limits for grain deviation, pin knots, and sapwood presence, with exceptions for certain timber species. These allowances balance natural wood characteristics with performance requirements, ensuring that only handles meeting these defect criteria are accepted.
Sampling sizes for testing depend on lot quantities, with selected samples undergoing dimensional, moisture, and performance assessments. The lot acceptance hinges on the number of defective units detected, ensuring that only compliant batches proceed to use.
Timber blanks must be seasoned prior to manufacture. Handles receive a brief initial dip in raw linseed oil at room temperature to control moisture and a subsequent soak in hot linseed oil to improve dimensional stability and longevity. The treatment is designed to reduce moisture-related defects and enhance handle performance.
This section elaborates on the sampling methodology and conformity thresholds, linking sample sizes to lot sizes and defining the maximum defective units allowed. Visual inspection precedes testing to ensure that only visually acceptable handles undergo further evaluation.
Handles may bear the ISI certification mark, indicating verified compliance with the standard. Marking is controlled under the Indian Standards Institution’s regulations and is contingent upon successful inspection and testing outcomes, thereby assuring users of consistent quality.
Details heavy-duty timber species appropriate for handles of robust striking tools, listing botanical and trade names with their suitability coefficients relative to axlewood. This appendix serves as a reference for selecting wood with high mechanical performance for demanding applications.
Extends the list of acceptable timbers for Class 2 handles, which includes all Class 1 species plus additional varieties. Suitability coefficients are provided to guide selection based on mechanical and physical properties conducive to tool handle performance.
Focuses on timber species recommended for light duty striking tool handles up to 60 cm in length. It provides species names and suitability ratings, supporting the selection of wood that ensures durability and safety for lighter impact tools.
Specifies that Class 4 handles for scooping tools use the same timber species as Classes 1 and 2. It lists species along with suitability coefficients, emphasizing the need for timbers with balanced toughness and flexibility for scooping tool applications.
Frequently Asked
Timber selection for wooden tool handles is based on suitability coefficients reflecting mechanical properties like shock resistance and hardness. For Class 3 light duty striking tools, species such as Teak, Shisham, and Mango are preferred. Class 4 scooping tools commonly use Teak, Sal, Eucalyptus, and Acacia. For Class 5 cutting and shaping tools, timbers like Teak, Shisham, Rosewood, and Mahogany are recommended. The choice ensures optimal performance and longevity tailored to tool function.
IS 620 permits a dimensional tolerance of +3 mm at fitting areas such as the head, socket, blade, or tongue to ensure proper assembly. At all other points on the handle, a tolerance of ±2 mm is allowed. These tolerances accommodate minor manufacturing variances while maintaining functionality.
Handles must be seasoned to achieve moisture content between 8% and 15%. Moisture measurement can be conducted using a moisture meter or the oven drying method as per IS 1708-1969. Oven drying involves weighing specimens before and after drying at 103±2°C until weight is constant. Post-manufacturing, handles are dipped momentarily in raw linseed oil at room temperature, followed by soaking accepted handles in hot linseed oil (~90°C) for one hour to stabilize moisture and enhance durability.
Permissible defects include a maximum grain deviation of 1 in 20 along the handle length, one pin knot beyond two-thirds of the length for handles longer than 30 cm, and sapwood presence limited to 20% area in places over 30 cm except for specific species where unlimited sapwood is allowed. Other defects such as pith, rot, checks, splits (except minor hair splits), borer holes, and warping are not permissible to ensure durability and safety.
Durability is verified through visual inspection to identify defects, followed by performance testing including striking tests where handles are subjected to repeated impacts on dummy tool heads. Samples are drawn based on lot size and tested for dimensional accuracy, moisture content, and mechanical performance. Handles must pass these tests without failure to be accepted, ensuring reliability under practical use conditions.
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