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Different natural stones as granite, marble and limestone are used in the construction industry and in the last few years, they are also used with a growing amount in manufacturing technology. It can be seen that a minimal damage can be observed on the edge of products of the mentioned industrial segments due to cutting., The primary goal of the presented paper is to examine the changes of the chipping at the edges of damaged granite samples The damage is resulted in cutting with different feedrate speed. The article tries to give recommendations to remedy the explored problems. During the research, there were 3 different granite boards with average particle size. 8 different sample surfaces were produced by 8 feed rates of each. Sample surfaces were made by an NC cutting centre which was especially created for chipping stones. On the sample surfaces, the size of the edge chipping at the output side of the tool was examined. The digitization and evaluation processes were implemented with a DinoLite microscope and its associated software. The examination confirms that the increase in feedrate reduces the average edge chipping rate The increase of federate ends up in a local minimum, whereafter strong loss of edge damage can be observed. The experiments manifest that the feedrate related to the best edge quality is independent from the grain size in all types of stone. It should be noted that in the case of using granite, the same change in can be observed when adjusting feedrate and the same approximation curve can be used for statistical evaluation.

Examination of Feedrate Impacts on Different Grain Size Granite Materials from Edge Damage Aspect