U radu je istražen i opisan postupak izrade modela zupčanika, od poliuretana, za lijevanje. Prije same izrade potrebno se bilo upoznati sa pravilima konstruiranja modela za lijevanje, odabirom materijala i namjenom modela. Dimenzije zupčanika određuju se proračunom. Pomoću proračunatih dimenzija model zupčanika se konstruira u 3D programu, pritom valja pripaziti na pravila konstruiranja ljevačkih modela. Samo konstruiranje zahtjeva dobro poznavanje tehnologije oblikovanja pomoću računala. Model zupčanika izrađen je prema crtežu DM1. Odabir materijala za izradu ovisi o veličini proizvodnje, složenosti, kvaliteti površine i dimenzijama modela. Izrada programskog koda za CNC stroj napravljena je od strane stručne osobe za upravljanje strojem. U radu su također navedena svojstva korištene ploče od poliuretana. U praktičnom dijelu rada opisan je postupak obrade modela na CNC glodalici. Također navedeni su primijenjeni alati i njihovi parametri obrade.

The paper explores and describes the process of making a gear pattern from polyurethane for casting. Prior to the development you should be informed with the rules of constructing patterns for casting. You need to select a compatible material and the function of the model. The dimensions of the gear are beeing determined by the estimate. Using the calculated dimension the model gear is getting constructed in a 3D program, where the attention should be paid to the construction rules for casting pattern. Designing a model requires a good knowledge of computer skills. The gear pattern is been made according to the drawing DM1 . The choice of materials for the production depends on the size of production, complexity, surface quality and dimensions of the model. The program code for the CNC machine was created by a professional who is operating with the machine. In the paper are also mentioned the properties of a used slab of polyurethane. The practical part of the paper describes the procedure of processing models on a CNC milling machine. Also there are listed applied tools and their processing parameters.