The aim of this paper is to provide a novel technique in production technology, which ensures the adequate tightening torque of workpiece by a vise connector to minimize the effect of elastic deformation, therefore geometrical inaccuracies roughness, during machining process. This effect emerges if the clamping force is excessively high, resulting in a deformed workpiece with a slightly convex surface. Once this surface is machined and the clamping force is released, the material returns to its initial shape and the newly machined flat surface will be concaved, resulting geometrical inaccuracy. The method is based on a simple workpiece, where the elastic deformation is numerically modelled and experimentally measured as a function of different clamping heights and tightening forces. During the experiments, the workpiece is tightened by bolts, step by step, and in each step, the deformation of the surface is measured with a coordinate measuring machine equipped with a Touch Probe Measurement system. This measurement process is followed by finite element modelling, where the same system, with identical boundary conditions (load, constraints, material properties), are computationally created to compare the numerically and experimentally obtained results. As a result of evaluating various cases, a user-friendly database was established that provides recommendations for specific geometry, position, and capture height. Our model can also propose a minimum clamping height if geometry, position, and maximum force(s) are specified during machining.