CNC 335 G Female thread grinding machine The natural granite machine bed on the CNC 335 G female thread grinding machine guarantees high precision. Moreover, the CNC controlled radius dresser with diamond roller ensures maximum accuracy. It is possible to machine metric female threads as well as Whitworth, trapezoidal and special profiles, such as spherical collar nuts with Gothic or radius profile. The machine is equipped with a female thread grinding support with additional vertical axis. This guarantees that the middle of the wheel is always positioned at the center height, even when the length of the grinding arbor varies.