Drilling machine

A drilling machine, comprising:

• a spindle extending horizontally;
• a spindle motor configured to drive the spindle;
• a box-shaped frame having an opening upward, the frame including,
• a linear motion guide support plate having a reference surface manufactured by cutting,
• a motor support portion disposed at a rear end of the linear motion guide support plate, and
• a ram support plate having a first ram guide hole, the ram support plate disposed at a front end of the linear motion guide support plate, the ram support plate having a height lower than the motor support portion;
• a linear motion guide disposed on the reference surface;
• a slider having a nut mounting hole at an upper portion, the slider having a lower end connected to the linear motion guide configured to reciprocate along the linear motion guide, the slider having a height substantially the same as the motor support portion;
• a ram penetrating the first ram guide hole to be fastened to a front surface of the slider;
• a feed screw including
• a screw shaft having a rear end supported by the motor support portion and a front end that is a free end, the screw shaft disposed above the ram, and
• a nut fastened to the nut mounting hole;
• and
• a feed motor fixed to the motor support portion to be connected to the screw shaft.