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Fig. 3. The surface roughness measurement system
RESULTS AND DISCUSSION In this study, experiments were performed to determine the effects of milling parameters on surface roughness. Four different machining parameters (such as spindle speed, feed rate, tool diameter, dept. of cut) were selected for grooving on MDF with CNC router. A total of 32 experimental elements were produced and surface roughness was measured. Before the statistical analysis, a One-Sample Kolmogorov-Smirnov Test indicated that the surface roughness measurement data showed a normal distribution. The main and interaction effects of machining parameters on surface roughness values were analyzed with variance analysis (ANOVA) at a 95% confidence level. Table 2 and Table 3 present main and interaction effects of machining parameters on surface parameters R a and R z , respectively. Table 2. Result of the ANOVA for R a Source DF SS MS F- value Sig. Spindle Speed_A 1 5.118 5.118 7.815 0.006* Feed Rate_B 3 15.674 5.225 7.978 0.000* Depth of cut_C 1 0.228 0.228 0.349 0.555 Tool diameter_D 1 3.380 3.380 5.162 0.024* A*B 3 0.432 0.144 0.220 0.883 A*C 1 0.018 0.018 0.027 0.869 A*D 1 0.660 0.660 1.007 0.316 B*C 3 4.705 1.568 2.395 0.069 B*D 3 2.138 0.713 1.088 0.354 C*D 1 0.284 0.284 0.433 0.511 A*B*C 3 1.462 0.487 0.744 0.527 A*B*D 3 1.907 0.636 0.971 0.407 A*C*D 1 1.492 1.492 2.278 0.132 B*C*D 3 3.466 1.155 1.764 0.154 A*B*C*D 3 1.548 0.516 0.788 0.501 Error 288 188.607 0.655 Total 320 10600.009 Corrected Total 319 231.121 DF: Degrees of freedom, SS: Sum of squares, MS: Mean square, *:p<0.05
İşleyen & Karamanoğlu (2019). “ Roughness of MDF ,” B io R esources 14(2), 3266-3277. 3270
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