This article deals with research of replica preparation of polypropylene surfaces machined by a laser beam. For the production of replicas, we decided to test the material SILOFLEX © which is mainly used in dentistry. There we are also looking for expertise in the preparation and application of this material on the surfaces. Subsequently investigated methods of statistical evaluation. In this article the cluster analysis is primarily used, this analysis uses four basic methods: Ward's Minimum Variance, Furthest Neighbour, Weighted Pair-Group and Pair-Weighted Centroid Group. The results are there also demonstrated using Abbott Firestone curves. The result of the article is to demonstrate the similarity of the amplitude of surface roughness parameters using above mentioned four methods Cluster analysis using Cophenetic correlation coefficient and using average values of cumulative totals compiled into the Abbott Firestone curve and the replica of the original surface. Original surfaces and replicas will be scanned using a contactless 3D scanner Talysurf CLI 500.

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During of aluminum alloy materials, it is possible to find three surface types which can be distinguish as primary, secondary and tertiary sections. In practice this is a big problem in case of finding the basic parameters of roughness and waviness as described by ISO 4288. According to our research, it is possible to use optical microscopy in the first step and subsequently to scan the surface in 3D in order to distinguish the type of. Another problem is how to determine the boundaries between the individual structures. The article describes methods to distinguish the boundaries in a more precise way by the cumulative functions, leading to more accurate determination of the surface quality parameters.

This article deals with the area of non-conventional technologies, in particular results of CO2 laser micro-machining are the subject of this experimental study. Laser beam and its impact on different types of polymeric materials were studied in details. The aim was to find an optimal combination of laser cutting parameters (power and feed) for ABS, POM, PS, PMMA, PA 6, PA 66, PC, POM, PP, PTFE and PVC. The laser machinability was evaluated with different technological parameters. Next, the Theory of hypothesis testing for evaluation of the laser machinability was applied.

describes a new method of the surface control. It is a method of surface printing using the SILOFLEX © dental silicone and the subsequent evaluation. The surface-quality control is carried out using profile geometries that are divided into two basic groups. The first group consists of contact devices and the second group consists of non-contact devices. Both of these groups can use 2D-and 3D-measurement options. Subsequently, the surface quality is assessed using the amplitude parameters specified in the standards. These parameters have to be evaluated complexly using the multi-parameter analysis. This analysis is used today by more and more companies and has become an essential part of the control. It is utilized for all the material types from the engineering industry to medicine. The article deals with a non-contact measurement method. It also shows possibilities of an evaluation using the multi-parameter analysis. Keywords: non-contact measurement, replica, surface quality Zadnja leta so bogata na podro~ju metrolo{kih raziskav. Najprej so bile raziskave osredoto~ene na podro~je kontaktnih merilnikov, {e posebej na podro~je kontaktnih profilometrov. Posledi~no z raziskavami in razvojem materialov so ugotovili, da kontaktni profilometri ne zadovoljujejo vseh potreb. Zato so se raziskovalci osredoto~ili {e na razvoj 3D-nekontaktnih opti~nih profilometrov in merilnikov. V tem~lanku avtorji opisujejo novo metodo kontrole povr{ine in njeno evaluacijo. To je metoda povr{inskega tiskanja z uporabo dentalnega silikona SILOFLEX © . Kontrola kvalitete povr{ine se izvaja s profilnimi geometrijami, ki so razdeljene v dve osnovni skupini. Prva skupina vsebuje kontaktne in druga nekontaktne naprave. Obe skupini lahko uporabljata 2D-in 3D-merilni opciji. Naknadno so kvaliteto povr{ine ocenili z amplitudnimi parametri, specificiranimi v standardih. Ti parametri morajo biti ovrednoteni kompleksno in jih avtorji zato imenujejo ve~parametri~na analiza. Ta analiza se danes vse bolj uveljavlja in uporablja v podjetjih kot pomemben del kontrole. Analiza je uporabna za vse vrste in`enirskih in medicinskih materialov. V tem~lanku avtorji opisujejo nekontaktne merilne metode. Prikazujejo pa tudi mo`nosti vrednotenja z uporabo ve~parametri~ne analize.