The aim of the paper is a structural design of a cutting device with option of length adjustment of cutting material. The introductory part of the paper is devoted to an analysis of available devices standardly employed in the process of wooden substance cutting. The core of the paper contains structural design and calculation of the individual parts, disposition solution of the device and a complete visualisation in the 3D models[Krenicky 2010]. The final part of the paper points out a necessity of application of newly-designed devices intended for wooden substance cutting as such case offers an absolute waste less utilization of wooden substance.