Abstract. The aim of this study is the comparative analysis of caprolon turning with replaceable polyhedral plates made from different materials namely one plate made from wolfram and cobalt alloy VC8 another from ceramic material tungsten free carbide KNT16. The basis of the experimental setup is laboratory research stand STD.201-2 which is used to study the technological system dynamics and the cutting forces registration at turning. The stand functionally consists of the head-tool holder, the interface unit, the sensors connecting module and PC. It is experimentally proved that caprolon turning both with the VC8 alloy cutting plate and the plate made from ceramic material KNT16 is a stable process. This is evidenced by the slight changes values of cutting force main component wherein the range of changes in the case of turning with the ceramic plate is smaller in comparison with the turning option with wolfram and cobalt alloy plate for the selected processing mode.

The article shows the possibility of designing and manufacturing using multi-coordinate grinding and sharpening machines with CNC for workable worm mills for machining straight-slotted slots. Screw backing provides the necessary values of the rear side corners, and the ability of CNC machines to achieve the required accuracy and manufacturability of the tool. The lack of such tools consists in the increase of the diametrical sizes in comparison with the classically used ones. A positive effect when using the principles of screw backlash is the shaping of the cutting edges of the teeth in a checkerboard pattern, which significantly reduces the cutting forces. The use of techno-logical 3D models as a result of the design allows, at the design stage, to evaluate the arising design flaws and to make the necessary corrective actions into the initial data of the tool.

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