Summary
The article presents the issue of designing portable machine tools in which module components are applied. Portable machine tools are mainly designed for machining of elements at the place of their final installation. Experience has shown that achieving high efficiency in the design of portable machine tools can only be reached through the use of mechatronic approach with the use of ready-made modular components (for example: ballscrew mechanisms, bearing units, linear guide systems). The designer of a machine tool must be aware of lack of information on selected parameters of these components. It is recommended to use simplified replacement models of these components and implement them to the model of entire machine tool to achieve desired static and dynamic characteristics. Authors of the article present an example of a modular component and its replacement model. They also present the results of calculations performed with the use of this.