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Fig. 2. a) The tool geometry and b) grooved MDF samples Methods Milling parameters such as spindle speed, feed rate, tool diameter, and depth of cut were determined for MDF grooving milling tests, as shown in Table 1. Table 1. Machining Parameters for MDF Grooving Parameters Unit Level_1 Level_2 Level_3 Level_4 Spindle speed rpm 18000 24000 - - Feed rate mm/min 2500 5000 7500 10000 Depth of cut mm 4 6 - - Tool Diameter mm 4 6 - - Surface roughness was measured with a Handysurf E-35 measurement equipment (Tokyo, Japan) based on stylus technique (Fig. 3). Roughness measurement was performed from 10 different points on each samples. The average roughness ( R a ) and mean peak to valley height ( R z ) are considered roughness parameters and characterized by ISO 4287 (1997). The tip diameter was 5 μm, and the measuring force was 4 mN. The surface roughness parameter was measured over a length of 1.25 mm and cut-off length of 0.25 mm. Experimental data of surface roughness was analyzed statistically using analysis of variance (ANOVA), which was performed at the confidence level of 95%. The parameters having a p-value less than 0.05 (p < 0.05) were considered significant. The difference between the levels of the parameters with significant value (p < 0.05) was determined by the t-test and Duncan test.
İşleyen & Karamanoğlu (2019). “ Roughness of MDF ,” B io R esources 14(2), 3266-3277. 3269
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