Before this step, the rotors appear to be finished. However, the most important machining operations have still to be performed, i.e. grinding. Here, the rotor tangs and the diameter faces are ground and later the screw involutes are ground. These grinding machines are directly connected to internal test measuring instruments, so that they can constantly control, in real time, the specifications required, and make any necessary corrections. It is the microscope, in its infinitesimal detail, which can measure the difference between an Intec product and a product from any other manufacturing company. Thousandths of a millimetre differences, which can however influence the overall performance of the final product.