An investigation on sample size distribution in electric discharge machining (EDM)


Darendeliler H. , Cogun C.

1991 (Diğer Kurumların Hakemli Dergileri) identifier

  • Cilt numarası:
  • Basım Tarihi: 1991

Özet

In this study, 150 experiments are conducted at different machining conditions to determine the sample size for workpiece removal rate and tool wear rate with a certain acceptable error in Electric Discharge Machining (EDM). Experimental workpiece removal rate and tool wear rate data are found to be distributed normally with a good fit. Statistically, it is shown that 150 experiments are large enough random sample to reflect the characteristics of the population. Two methods are proposed to find the sample size by using the experimental data. Sample sizes obtained from the proposed methods are compared with those obtained from the classical sample size determination formula. The results from the formulation and one of the two proposed methods are found to be quite consistent. Also, the behavior of maximum error terms with increasing sample size is investigated for different machining conditions. (A)