The desktop milling machine with an ovate-shaped bridge is a desktop milling machine of the computer numerical control (CNC) type having a portion of the bridge or frame structure configured to alleviate bridge deflections and deformations that are caused during the high-speed milling processes. Preferably, the bridge has an ovate arch, or has a rear face having an ovate contour.

A controller performs high-accuracy oscillation control in which an axis driven by a motor is rocked in accordance with the rotation of a spindle motor for driving a main spindle. This controller determines a reference speed of rocking motion based on a reference speed set in advance, a reference main spindle rotational speed of the spindle motor, and an actual main spindle rotational speed, and calculates a rocking motion speed for each control period based on the determined reference speed of the rocking motion. The calculated rocking motion speed for each control period is added to a command outputted by the controller for controlling the position of the motor for each control period.

A controller performs high-accuracy oscillation control in which an axis driven by a motor is rocked in accordance with the rotation of a spindle motor for driving a main spindle. This controller determines a reference speed of rocking motion based on a reference speed set in advance, a reference main spindle rotational speed of the spindle motor, and an actual main spindle rotational speed, and calculates a rocking motion speed for each control period based on the determined reference speed of the rocking motion. The calculated rocking motion speed for each control period is added to a command outputted by the controller for controlling the position of the motor for each control period.