ISO 28927-4:2010/Amd 1:2017

Overview

ISO 28927-4:2010/Amd 1:2017 is an important amendment to the international standard for hand-held portable power tools, specifically focusing on test methods for evaluating vibration emissions from straight grinders. Published by ISO, this amendment introduces provisions for the evaluation of vibration emissions when using cupped wire brushes with straight grinders. Vibration measurement and control are critical for ensuring operator safety and compliance with occupational health regulations.

This standard serves as a guideline for manufacturers, safety inspectors, and testing laboratories to accurately assess vibration levels emitted during tool operation, helping to reduce hand-arm vibration syndrome (HAVS) risks and improve ergonomic tool design.

Key Topics

• Scope Extension
  The amendment extends the original scope of ISO 28927-4 to include straight grinders equipped with wire brushes, specifically cupped wire brushes. It clarifies that these vibration evaluation methods are not applicable to die grinders where the inserted tool is mounted in a collet.

• Vibration Measurement Protocols
  Revised measurement locations and detailed guidelines for testing straight grinders ensure consistent and repeatable vibration data collection. Measurement points are specified for different tool configurations, including straight grinders with type 1 wheel and type 18R cylindrical plugs.

• Correction Factor for Wire Brushes
  A key feature of this amendment is the introduction of a correction factor of 1.6 applied to vibration values obtained when grinders operate with cupped wire brushes. This correction ensures more accurate representation of real-world vibration exposure for such tool configurations.

• References to Related Standards
  The amendment references other relevant ISO standards for abrasive wheel dimensions (ISO 603-14) and the handling of abrasives outside the scope via ISO 20643. It also highlights additional technical reports relating to hand-arm vibration (e.g., ISO/TR 27609).

Applications

• Tool Manufacturers
  Manufacturers of straight grinders and wire brush attachments can use the updated test methods to evaluate and certify their products for vibration emissions. This helps meet international safety requirements and improve product ergonomics.

• Occupational Safety Compliance
  Safety professionals and regulatory bodies benefit from this standard by utilizing its testing framework to measure vibration exposure accurately during tool operation, thereby enforcing limits to protect workers from vibration-related health issues.

• Testing Laboratories
  Independent labs testing pneumatic and electric hand-held grinders will apply these methods when assessing vibration levels for compliance and product certification purposes.

• Ergonomic Product Design
  Insights from vibration testing enable designers to reduce adverse vibration effects on users, thereby minimizing the risk of hand-arm vibration syndrome (HAVS) and improving user comfort.

Related Standards

• ISO 603-14: Bonded abrasive products - Dimensions - Part 14: Grinding wheels for deburring and fettling/snagging on an angle grinder. This standard provides detailed wheel dimensions referenced for vibration testing.

• ISO 20643: Covers vibration testing for abrasive tools not included in ISO 28927-4, facilitating comprehensive coverage of grinding and abrasive accessories.

• ISO/TR 27609: Technical report related to hand-arm vibration exposure and measurement methodologies to complement the test methods in ISO 28927-4.

• Hand-Arm Vibration Technical Report: Further guidance is available through this supplementary report, helping to understand and mitigate health risks associated with vibration emissions.

Keywords: ISO 28927-4 amendment, vibration emission testing, straight grinders, cupped wire brushes, hand-held power tools, hand-arm vibration syndrome (HAVS), vibration correction factor, abrasive wheel dimensions, occupational safety, ergonomic tool design, power tool standards.