This study investigates the mechanical properties of 3D‐printed plastic parts fabricated using Fused Deposition Modeling (FDM). For this purpose, a 3D printer named KASAME was designed and built by the researchers. The test samples were fabricated using polylactic acid (PLA). The experiments were conducted using three melt temperatures (190°C, 205°C, and 220°C), four layer thickness values (0.06 mm, 0.10 mm, 0.19 mm, and 0.35 mm), and three raster pattern orientations (+45°/−45° [the crisscross pattern], horizontal and vertical). Tensile strength tests were performed to determine tensile strength values of the samples and fracture surfaces were also analyzed. Using artificial neural networks, a mathematical model for the tensile test results was generated corresponding to the raster pattern employed in 3D fabrication. Tensile strength tests indicated that melt temperature, layer thickness, and raster pattern orientation had a significant effect on the tensile strengths of the samples. According to the result of the experiment, the maximum average tensile strength values were observed for the samples fabricated using the crisscross raster pattern. The analysis of variance (ANOVA) table shows the raster pattern (PCR) value of 48.68% was obtained with the highest degree of influence. With respect to R2, the best performing artificial neural network model, with test and training values of 0.999199 and 0.999997, respectively, was observed to be the crisscross raster pattern. Copyright © 2016 John Wiley & Sons, Ltd.

No abstract

No abstract

No abstract

In this study tapping operations were carried out using taps of different diameters and with different cutting parameters on AISI 304 austenitic stainless steel. The cutting performances of the taps were determined according to the cutting torques created during the threading and the depth of cut for each cutting feed (Q). With the aid of the obtained experimental data the solution suggestions to the problems in the threading operations for AISI 304 steel were developed. As a result it was specified that the increasing amount of cutting in each pass directly affected the cutting torque. It was determined that there was a tendency to decrease the cutting torque with the increasing depth of cut for each cutting feed. The best tool-life results for an M5 tap were obtained at a 5-mm Q value, whereas for M6 taps it was at a 3-mm Q value. Keywords: tapping, AISI 304, machinability V {tudiji je bilo izvedeno vrezovanje notranjih navojev z uporabo navojnega vreznika z razli~nimi premeri in razli~nimi nivoji vrezovalnih parametrov v avstenitnem jeklu AISI 304. Zmogljivosti vrezovanja navojnih vreznikov so bile dolo~ene glede na moment, ki je nastal med vrezovanjem navojev v globino, za vsako hitrost podajanja pri vrezovanju (Q). S pomo~jo dobljenih eksperimentalnih podatkov so bili postavljeni predlogi re{itev problemov pri postopku vrezovanja navojev pri jeklu AISI 304. Pokazalo se je, da pove~anje vrezovanja pri vsakem prehodu neposredno vpliva na moment pri vrezovanju. Ugotovljeno je, da se zmanj{uje moment vrezovanja s pove~anjem globine reza pri vsakem podajanju pri vrezovanju. Najbolj{a zdr`ljivost orodja pri M5 vrezniku je bila dose`ena pri vrednosti Q = 5 mm, pri vrezniku M6 pa pri vrednosti Q = 3 mm. Klju~ne besede: vrezovanje notranjih navojev, AISI 304, strojna obdelava