Master’s thesis contains technological procedure for developing product which includes design, making of technological documentation, choosing parameters for CNC machining, and measuring of the final product. The product from this master thesis is “Oil control block”. This is one of the parts of the high voltage switchgear GIS „Gas Insulated Switchgear“ which is used for regulation of pressure during switching. The product is made from material C45 (1.0503) according to European norm EN 10277-2-2008. The technological process is shown in spreadsheet view. Also it’s explained the workholding device and the way of using it, then it’s shown the technological documentation which follows the machining process, then the NC program and 3D model. I...