Production of tools for die casting of aluminium is an expensive and a long manufacturing process, which in effect carries the high price of the tool. Toolmakers are challenged to manufacture tools for die casting with great precision, in shorter manufacturing times and without greater required finishing. With every extra finishing the manufacturing cost rises, lowering competitiveness and the chance of survival in a challenging market. Most time and resources are used on manufacturing of tool dies. Tools are manufactured using conventional and unconventional manufacturing technologies, and usually the more familiar, but more expensive machining methods are used which carry less risk. Die cast tooling components are required to have increased hardness to reduce tool wear caused by exploitation in high temperature casting environment so therefore they go through heat treatment to gain required hardness. In this thesis manufacturing methods which are required to manufacture a tool are described by the example of one toolshop, and which are the influential parameters of end quality and precision of components, and thus that from an aluminium casting. The technological process of die making is explained, and the material allowances required for later heat treatment and finishing. Die material allowances, thermal deformations and finished dies were analysed on the models obtained by 3D scanning method. In the last part of the thesis process improvement is proposed based on the data obtained by analyzing scans of three different dies.