Vibrations emitted by hand-held screwdrivers (Contributo in atti di convegno)

Type
Label
  • Vibrations emitted by hand-held screwdrivers (Contributo in atti di convegno) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Alternative label
  • Peretti Alessandro; Bonomini Francesco; Pedrielli Francesca; Pasqua di Bisceglie Anita (2010)
    Vibrations emitted by hand-held screwdrivers
    in 8th International Scientific Conference IOHA2010, Roma, 28.09.2010-02.10.2010
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Peretti Alessandro; Bonomini Francesco; Pedrielli Francesca; Pasqua di Bisceglie Anita (literal)
Pagina inizio
  • 222 (literal)
Pagina fine
  • 223 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 2 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Post-Graduation School in Occupational Medicine, University of Padua; Peretti e associati srl, Padova; CNR-Imamoter Institute, National Research Council of Italy, Ferrara; Department of Environmental Medicine, University of Padua (literal)
Titolo
  • Vibrations emitted by hand-held screwdrivers (literal)
Abstract
  • Hand-held screwdrivers, either electric or pneumatic, are widely used in industrial and craft firms for assembling operations and/or fixing metallic, wooden and plastic parts. Therefore numerous operators are exposed to hand-arm vibration produced by these tools. Depending on the clutch controlling the tightening torque or on the operating mechanism, a distinction could be made: - shut-off clutch or slip clutch screwdrivers, with straight or pistol grip, generally having a tightening torque between 0.5 and 20 Nm and mass between 0.3 and 1.5 kg; - hydraulic pulse or mechanic impact wrenches, mainly with pistol grip and generally having a tightening torque between 10 and 1000 Nm and mass between 1 and 10 kg. All data were collected in 10 different firms and refer to 116 screwdrivers manufactured by 13 different companies. All the screwdrivers involved in this study were tested during normal activities. For each one, 3 measurements were made on average, altogether representing 11 screwing events. Vibration measurements were made using one PCB Piezotronics ICP (Integrated Circuit Piezoelectric) tri-axial accelerometer mounted on a specific block and rigidly fixed at the handle through a metal strap. The transducer was connected to an 8-channel measurement system (Soundbook from Sinus Messtechnik) equipped with built-in digital weighting filters as defined in ISO 8041 for assessing human response to hand-arm vibration. The vibration total value calculated from the frequency-weighted r.m.s. acceleration values for the 3 axes was determined. The Single Event Level (SEL) for the vibration total value related to 1 screwing event and to 1 second was determined as well. Vibrations emitted by screwdrivers are mainly influenced by: clutch and operating mechanism, torque, tool and attachment, and different working conditions. Results from this investigation showed that the vibration total value is generally ranging: - from 0.6 to 2.7 m/s2 for shut-off clutch screwdrivers; - from 1.6 to 6.3 m/s2 for slip clutch screwdrivers; - from 2.2 to 4.7 m/s2 for hydraulic pulse wrenches; - from 3.0 to 14.4 m/s2 for mechanic impact wrenches. Referring to daily exposure action value (2.5 m/s2) and limit value (5 m/s2) as defined by Directive 2002/44/EC, the worker exposure for a hypothetic 4-2 hour working shift with the tested screwdrivers is: - lower than 2.5 m/s2 for 81-93 % screwdrivers; - between 2.5 and 5 m/s2 for 17-6 % screwdrivers; - higher than 5 m/s2 for 2-1 % screwdrivers. In conclusion, when screwdrivers are extensively used, special attention must be given to vibrations emitted by these tools since they may constitute a risk for their operators. (literal)
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