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PD ISO/TR 27609:2007

Current

Current

The latest, up-to-date edition.

Vibration in hand-held tools. Vibration measurement methods for grinders. Evaluation of round-robin test

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-07-2007

€254.76
Excluding VAT

Foreword
Introduction
1 Scope
2 Symbols and abbreviated terms
3 Method
4 Description of two test methods evaluated
  4.1 Unbalance disc test method
  4.2 Grinding test method
5 Results
  5.1 General
  5.2 Spread of methods
      5.2.1 Unbalance disc test
      5.2.2 Grinding test
      5.2.3 Correlation between no-load and grinding
            vibration
  5.3 Unbalance disc test for simulating real grinding
  5.4 Measurements repeated over time
6 Conclusion
  6.1 Unbalance disc test
  6.2 Grinding test
  6.3 Repeatability
Annex A (informative) Test instructions - "Instruction
        for participants in the 2003 round-robin
        test on grinders. The aim is to evaluate the
        proposed changes to ISO 8662-4:1994 in
        document ISO/TC 118/SC 3/WG 3 N211"
Annex B (informative) Diagrams
Annex C (informative) List of grinders and laboratories
Bibliography

Specifies an evaluation of a round-robin test of vibration measurement methods for determining vibration in hand-held grinders.

Committee
MCE/8/-/2
DocumentType
Standard
Pages
38
PublisherName
British Standards Institution
Status
Current

This Technical Report presents an evaluation of a round-robin test of vibration measurement methods for determining vibration in hand-held grinders. The aim of the round-robin test was to establish a test method that could meet the requirement of ISO20643 for measurement of vibration emissions in three directions, for accordance with the planned-to-be-revised ISO8662-4. The value obtained by such a test method must correspond to the highest vibration values likely to occur under typical and normal working conditions of the machine, i.e. the upper quartile of the vibration in real use. This acknowledges that the upper boundary of “typical and normal” conditions can be exceeded by some conditions of “real use”. Vibration at grinding can mainly be divided into vibration caused by unbalance of the grinding wheel and process vibration generated by the contact between the grinding wheel and the work piece. The unbalance part has been shown to be the greater of the two and ISO8662-4 is based on this. In this Technical Report, the test method consists of a number of averaged measurements using an unbalance disc, with an unbalance corresponding to the upper limit of the unbalances found among real grinding wheels. Whereas ISO8662-4 covers all types of hand-held grinders, the round-robin test presented in this Technical Report was based on grinding with depressed centre-wheels, one of the most common grinding applications. The types of grinder used in the round-robin test are given in Table1. Table1 Grinder types and sizes used in test Type of grinder Wheel size 125mm
(5\'\') 230mm
(9\'\') Pneumatic Without auto-balancing unit With auto-balancing unit Electric With auto-balancing unit Without auto-balancing unit Two tests of the grinders were made: one using an unbalance disc and the other by real grinding. The unbalance disc test was made with a disc of new design, with the shape of a depressed centre wheel. One reference disc was sent together with the grinding machines, while the other was locally manufactured by the measuring lab. Grinding was made on mild steel with locally purchased grinding wheels. Detailed test instructions were distributed to the participants before the start of the round-robin test.

Standards Relationship
ISO/TR 27609:2007 Identical

EN 12096:1997 Mechanical vibration - Declaration and verification of vibration emission values
ISO 20643:2005 Mechanical vibration — Hand-held and hand-guided machinery — Principles for evaluation of vibration emission
ISO 8662-4:1994 Hand-held portable power tools Measurement of vibrations at the handle Part 4: Grinders

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