The effects of step over, feed rate and finish depth on the surface roughness of fiberboard processed with CNC machine

Fiberboard is used extensively in furniture production in all over the word. One of the most important reasons for the preference of fibreboard is the easy shaping of its surfaces. In the past, the surfaces of the fiberboard were processed using conventional machines. Nowadays, Computer Numerical Control (CNC) machines are used in the processing of the fiberboard. CNC machines is operated using some computer control commands which provide the action of the machine. The code file consisting of these commands contains some adjustments such as step over, spindle speed, feed rate, finish depth, machining strategy, step down, plunge rate etc. These adjustments change the surface roughness of the processed section of fiberboard. In this study, the influence of finish depth (2 and 6 mm), step over (40%, 60% and 80%) and feed rate (3, 5 and 7 m/min) settings on the surface roughness of fiberboard were investigated. Ra roughness value of processed section of fiberboard test samples was determined using contact stylus method. According to the obtained data, it was concluded that the surface roughness increased as finish depth, feed rate and step over are increased