This standard outlines the criteria for wooden handles designed for use with rasps, engineers' files, and scrapers, detailing dimensions, material quality, workmanship, and marking requirements. It aims to guarantee ergonomic design, durability, and safe usage of these wooden handles. The code is crucial for producers, quality inspectors, and engineers engaged in manufacturing and maintenance of these hand tools.
Overview
This standard outlines the criteria for wooden handles designed for use with rasps, engineers' files, and scrapers, detailing dimensions, material quality, workmanship, and marking requirements. It aims to guarantee ergonomic design, durability, and safe usage of these wooden handles. The code is crucial for producers, quality inspectors, and engineers engaged in manufacturing and maintenance of these hand tools.
Audience
Contents
Structure
This section defines the scope of the standard, specifying the dimensional, tolerance, and marking requirements for wooden handles intended for rasps, engineers' files, and scrapers. It includes applicable definitions from timber and wooden handle standards and provides detailed dimensional data with allowable deviations.
Lists essential Indian Standards referenced by this code, including those that cover general wooden tool handle requirements, timber technology terminology, and specifications for engineers' files and scrapers. It also summarizes key dimensional values and marking obligations.
Provides definitions adopted from related timber and tool handle standards to ensure clarity and uniform understanding of technical terms used throughout the document.
Details the types of timber suitable for the handles, moisture content limits, grain orientation restrictions, and quality requirements to guarantee strength and durability.
Describes the design dimensions and tolerances for wooden handles, the construction of ferrules, and the fitting requirements to ensure secure attachment and ergonomic handling.
Presents comprehensive tables of the dimensions and corresponding tolerances for various handle sizes suitable for different tool sizes, emphasizing interchangeability and user comfort.
Summarizes further requirements including adherence to referenced standards, permissible defects, manufacturing guidelines, and sampling/testing procedures to uphold handle quality.
Specifies the mandatory markings each handle must bear, including manufacturer identification, production year, and the compatible tool size to ensure traceability and proper use.
Frequently Asked
IS 2895 mandates the use of Class V timbers, as defined in IS 620:1985, for making handles suitable for rasps, engineers' files, and scrapers. Common hardwood species within this category include Ash, Hickory, Beech, Sal, and Neem. The timber must be well-seasoned, maintaining moisture content at or below 15%, with grain deviation not exceeding 1:15, and free from defects such as pith, sapwood, decay, splits beyond hairline cracks, insect damage, and warping.
The standard provides precise dimensional values and tolerances based on the tool size. For example, handle length (L) ranges from 90 mm to 150 mm with a ±3 mm tolerance; widths (A, A1) vary from 32 mm to 38 mm with ±2 mm tolerance; thickness (B) ranges from 16 mm to 22 mm also with ±2 mm tolerance. Other dimensions such as slot depth (D) have asymmetric tolerances of +0/-1 mm, while slot length (F) tolerances are +2/-0 mm. These measurements ensure handles fit securely and function ergonomically with the corresponding tools.
Ferrules must be fabricated from seamless tubes or from sheet metal that is butt welded to provide structural integrity. For galvanized mild steel ferrules, the thickness should be 1.6 ± 0.2 mm. The ferrule must be firmly and snugly fit onto the wooden handle to prevent looseness during use, as detailed in the standard's illustrations. Correct ferrule fitting is essential to ensure durability and secure assembly.
To enhance durability, handles should be made from well-seasoned timber with moisture content not exceeding 15%. Grain inclination should be limited to 1 in 15, avoiding defects such as pith, sapwood, decay, splits, insect damage, and warping. After manufacturing, handles are recommended to be briefly dipped in raw linseed oil at ambient temperature. This treatment reduces moisture exchange and improves resistance to environmental influences, thereby extending the service life of the handles.
Each wooden handle must bear clear and permanent markings indicating the manufacturer's identity, the year it was produced, and the size of the rasp, file, or scraper it is designed to fit. These markings enable traceability, facilitate quality control, and help ensure that handles are correctly matched to their respective tools.
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