Özet:

CNC machines have been used in different manufacturing industries for years. These machines have some properties such as superior sensitivity, high manufacturing speed, and unlimited repetition of operations. Some important adjustments have to be made to operate of CNC machines. These are spindle speed, cutting depth, step over, feed rate, machine safe height, clearance strategy, and so on. These adjustments have an effect on the surface roughness of the material being processed and on the processing time for each part. In this study, the influence of the step over (20%, 40%, 60% and 80%) and feed rate (1, 3, 5 and 7 m / min) settings on the surface roughness of medium density fiberboard and the processing time were investigated. The test specimens were processed using the raster strategy with the pocket processing method. Surface roughness measurements were made according to TS 971. Three roughness values were determined, with an average roughness (Ra), a 10 point roughness (Rz) and a root mean square average (Rq). According to the obtained data; as the feed rate and the step over are increased, the surface roughness is increased and the processing time is decreased. In addition, it has been determined that the step over is more effective than the feed rate on the surface roughness and the processing time.

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