Abstract: A single screw positive displacement compressor mechanism employing shallow ate rotor tooth penetration of the main rotor for purposes of reducing internal leakage and consequent compressor inefficiencies. The invention is provided with an interrupted main rotor thread for purposes of insuring multiple gate rotor teeth meshing with the drive portion of the main rotor thread, thereby reducing gate rotor tooth flank loads in the compressor section of the device. Provision is also made for main rotor thread baffling between the main rotor chamber section and the mechanism inlet.

Abstract: A method for manufacturing precision gate-rotors and gate-rotor supports a single-screw mechanism by cutting the complex tooth profiles in a cylindrical gate-rotor blank. The cylindrical blank is rotated about its center axis as a cutting tool is translated in a fixed two-axis plane, one axis being the centerline of the cylindrical blank and the second axis being a line extending radially therefrom. This process may be carried out by a multi-axis, numerically controlled milling machine.