Abstract: According to this invention, this splitting process to obtain thin cuts of a determined thickness consists in simultaneously attacking the two ends of a timber quarter laying horizontally and secured at its two ends between two gripping devices (3) which may oscillate transversely, by means of two splitting tools (7), each also able to oscillate transversely in order to follow the grain of the wood, at the free end of a shaft (8A) of a control cylinder (8), shaft on which each corresponding gripping devices (3) is supported and slides, and the support (4) of this jaw which is actuated and moved by a cylinder (5), and which actuates, as a result, the positioning for tightening or release of this machine.