EFFECTS OF THE VIBRATIONS OF POWERED HAND TOOLS ON USERS: A CASE STUDY
Powered hand tools reduce the time spent on tasks; however, they generate vibrations which may pose significant
risk to operators’ health. In this study, the impact of power hand tools on users was considered. Five basic power
hand tools were identified and the impact of vibration was assessed on users. Digital vibration meter was used to
measure the vibration produced on five operators while operating the identified power tools. Values obtained from
each operator were imputed to the hand-arm vibration calculator to determine daily exposure limit and total exposure
point for each of them. Results obtained indicate daily exposure limit of 4.08, 11.64, 21.06, 46.96 and 62.36
m/s2; and average total exposure point of 261, 2242, 7107, 35436, and 63781; for hand milling machine, hand drilling
machine, grinding machine, hand mower, and lawn mower respectively. Among the power tools examined, it is only
the exposure vibration from hand milling machine that was within the recommended acceptable daily exposure limit
of 5 m/s2 and total exposure point of 400. Measures were suggested to lessen the exposure time and vibration magnitude
the operators are exposed to so as to reduce the probability of hand-arm vibration syndrome (HAVS) among
1. Kuijt-Evers, L. F. M., Boscha, T., Huysmansc, M. A., De Looze, M. P., Vink, P.(2007). Association between between objective and subjective measurements of comfort and discomfort in hand tools.Applied Ergonomics, vol. 38, 643–654.
2. Macarthur, B. (2015). Apparatus including powered tool confi gured to fasten fastener to assembly United States, Honda Motor Co., Ltd. Tokyo, Japan, Patent No: 9108307, available at: http://www.freepatentsonline. com/9108307.html (accessed: 12th August 2018).
3. Fredrick, H. Advantages and disadvantages of power hand tools.available at: http://www.ehow. com/info_8566574_advantages-disadvantages- hand-power-tools.html/(Accessed:17-Nov- 2018)
4. Kong, Y. K., Lowe, B. D., Lee, S. J., Krieg, E. F. (2008). Evaluation of handle shapes for screw driving. Applied Ergononomics, vol. 39, 191–198.
5. Bisht, D. S., Khan, M. R. (2013). Ergonomic Assessment Methods for the Evaluation of hand held industrial products: A review.In: Proceedings of the World Congress on Engineering, July 3 -5, 2013, London, UK.
6. Li, K. W. (2002). Ergonomic design and evaluation of wire-tying hand tools. International Journal of Industrial Ergonomics, vol. 30, 149–161.
7. National Occupational Safety and Health (NIOSH) (1989). Occupational Exposure to Hand-Arm Vibration: Criteria for a Recommended Standard. [DHHS (NIOSH) Publication No. 89-106.] Cincinnati, OH: US Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 1-127.
8. South, T. (2004).Managing Noise and Vibration at Work, Butterworth Heinemann Books, Oxford, UK, 80 85.
9. Das, B. (2007). Assessment of the Ergonomics Quality of Hand-Held Tools and Computer Input Devices. Ergonomic, Human Factors and Safety, vol. 1, 23-29.
10. Forouharmajd, F., Nassiri, P. (2011). The evaluation of hand arm vibration levels in hand held pneumatic tools (Rock Drill) by pneurop Cagi test code.Journal of Low Frequeny Noise Vibration and Active Control, vol. 30, no. 4, 329 333.
11. Forouharmajd, F., Azmoon, H., Akbari, J. Soury, S. (2016).Evaluating the transmitted vibration to operator's hands hand and effect of protective gloves in real condition, based on International Standard Organization 5349 standard. International Journal of Environmental Health Engineering. vol. 4, no. 4, 1-5.
12. Boyle, J. C., Smith, N. J., Burke, F. D. (1988).Vibration white finger. Journal of Hand Surgery.vol. 13, 171 176.
13. Dong, R. G., Sinsel, E. W., Welcome, D. E., Warren, C., Xu, X. S., McDowell, T. W., Wu, J. Z. (2015). Review and evaluation of hand-arm coordinate systems for measuring vibration exposure, biodynamic responses, and hand forces. Safety and Health Work, vol. 6, no. 3, 159-173.
14. ISO 2954 (2012). Mechanical vibration of rotating and reciprocating machinery – Requirements for instruments for measuring vibration severity.
15. Griffin, M. J. (2012). Hand book of human vibration, Elsevier Academic Press, London, UK.
16. HSE Books (2005). Control the risks from hand-arm vibration - Advice for employers on the Control of Vibration at Work Regulations, available at: www.hse. gov.uk/pubns/indg175.pdf, (accessed: 20 November 2018).
17. Arvidsson, I., Akesson, I. and Hansson, G. A. (2003). Wrist movements among females in a repetitive, non-forceful work. Applied Ergonomics, vol. 34, 309–316.
18. Rens, G., Dubrulle, P., Malchaire, J. (1987). Efficiency of conventional gloves against vibration. The Annals of Occupational Hygiene, vol. 31, no. 2, 249 254.
19. Reynolds, D., Jetzer, T. (1998). Use of air bladder technology to solve hand tool vibration problems. in: Proceedings of the Eighth International Conference on Hand Arm Vibration, Umea, Sweden.
20. Vranjes, B., & Todic, M. . A model of analysis of the occupational safety and health system in the production system. Journal of Applied Engineering Science, 17(3), 264 – 272.