Fibreboard composites represent an increasing share of the materials used to manufacture furniture. At machining processing, due to their specific structure, we have problems related to the surface roughness. We examined how geometry of tools affected the morphology of treated surfaces and that of tool life. Appropriate geometric flexible tool was designed and manufactured tocarry out experiments at the edges of MDF boards, and to identify what was happening with the surface and tool wear. The surface was examined with Mitutoyo SJ-301 device according to standards for measuring the roughness of DIN 4768 and ISO 4287/1. The results of comparative tests between the MDF and beech show that there is a correlation between the geometry of rake angle and the surface roughness, increasing the rake angle reduces the surface roughness. As we did not detect the wear of the blade through the roughness of the processed surface, we inspected the wear of the cutting edge under microscope. We came to the conclusion that the rake angle of 25 ° causes the largest abrasion of tool. The most appropriate rake angle for treatment of fibreboard composites is somewhere between 10 ° to 15 °.