ISO 6123-3:1985

Overview

ISO 6123-3:1985 is an international standard published by the International Organization for Standardization (ISO) that specifies dimensional tolerances and test methods for rubber- or plastics-covered rollers. These rollers consist of a cylindrical metal core covered with a layer of rubber or plastic designed for various industrial applications. The standard addresses the critical aspects of dimensional accuracy to ensure optimal performance and durability of covered rollers.

This part, Part 3: Dimensional tolerances, complements Parts 1 and 2, which cover hardness requirements and surface characteristics respectively. It defines tolerance classes, measurement methods, and testing protocols to control roller dimensions, including diameter, length, cylindricity, run-out, and crown profiles.

Key Topics

• Scope and application: Specifies dimensional tolerance classes and measurement procedures for covered rollers with rubber or plastic coverings, typically used in various industrial machinery.
• Covered roller definition: Cylindrical metal cores coated with rubber or plastic with varied sizes and hardness grades.
• Tolerance classes: Six classes of dimensional tolerances from very high precision (XXP) down to non-critical (N), depending on roller type, cover hardness, and application needs.
• Measurement conditions:
  • Standard testing temperature: 23 ± 2 °C or 27 ± 2 °C to maintain consistency.
  • Instruments: Calipers, micrometers, dial gauges, tape measures with specific pressure requirements for accurate measurement regardless of roller hardness.
• Dimensional parameters covered:
  • Roller diameter tolerances based on length-to-diameter ratio and rigidity.
  • Cover length tolerances adapting to precise or general quality requirements.
  • Run-out tolerances controlling radial movement during rotation.
  • Cylindricity tolerances maintaining roundness and smooth surface profile.
  • Crown tolerances defining allowable deviations in roller curvature, including taper crown and cosine crown types.
• Test methods: Detailed instructions for temperature equilibrium, suitable instruments, and measurement sequences.
• Special notes: Tolerances may vary in positive or negative directions for flexibility; tolerance limits differ for soft versus hard covers.

Applications

ISO 6123-3:1985 is widely applicable in manufacturing and quality control environments where rubber- or plastics-covered rollers are utilized, including:

• Printing industry: Rollers in presses require precise diameters and smooth surfaces for consistent ink distribution.
• Conveyor systems: Ensuring roller dimensional accuracy aids in reliable movement and reduced wear.
• Material handling: Rollers used in packaging or processing machinery demand tight tolerances to avoid product damage.
• Automotive and industrial machinery: Rollers in rollers conveyers, laminators, and compactors benefit from standardized specifications for durability and performance.
• Rubber and plastics manufacturing: Production of custom rollers conforming to exact standards for specialized applications.

By adhering to ISO 6123-3 dimensional tolerances, manufacturers can achieve consistent quality, reduce costly rework, and extend product life.

Related Standards

• ISO 6123-1: Rubber- or plastics-covered rollers - Part 1: Requirements for hardness - Defines hardness criteria essential for roller performance.
• ISO 6123-2: Rubber- or plastics-covered rollers - Part 2: Surface characteristics - Specifies surface finish and texture requirements.
• ISO 471: Rubber - Standard temperatures, humidities, and times for conditioning and testing of test pieces - Provides environmental conditions for accurate measurement.
• ISO 1101: Technical drawings - Geometrical tolerancing - Offers definitions and symbols for geometric dimensions such as cylindricity, run-out, and form tolerances.
• ISO/TR 7621: Rubber or plastics covered rollers - Enquiries and orders - Gives recommendations for technical information to be supplied by purchasers for covered rollers.

Keywords: ISO 6123-3, dimensional tolerances, rubber-covered rollers, plastics-covered rollers, roller specifications, roller measurement methods, cylindricity tolerances, run-out tolerances, crown tolerances, industrial rollers, roller quality standards, ISO roller standards.