The F function instruction is used to control the cutting feed. There are two ways to use this program.

(1) Feed number per revolution The numbers following the programming format G95 F to F indicate the spindle feed per revolution in mm/r. Example: G95 F0.2 means feed 0.2 mm/r.

(2) Feed rate per minute The number following the programming format G94 F to F indicates the feed per minute in mm/min. Example: G94 F100 means the feed rate is 100mm/min.

2. S function S function command is used to control the spindle speed. The numbers following the programming format S to S indicate the spindle speed in units of r/min. On machines with constant line speed, the S function command has the following effects.

(1) Maximum speed limit programming format The numbers following G50 S to S indicate the maximum speed: r/min. Example: G50 S3000 means the maximum speed limit is 3000r/min.

(2) Constant line speed control programming format The numbers following G96 S to S indicate a constant linear speed: m/min. Example: G96 S150 means that the cutting point line speed is controlled at 150 m/min.

(3) Constant line speed cancels the programming format The numbers following G97 S to S indicate the spindle speed after the constant speed control is canceled. If S is not specified, the final value of G96 will be retained. Example: G97 S3000 means that the spindle speed is 3000 r/min after the constant speed control is cancelled.

3. T function T function instruction is used to select the tool used for machining. The programming format T~T is usually followed by two digits to indicate the selected tool number. However, there are four numbers behind T, the first two are the tool number, the last two are the tool length compensation number, and the tool nose arc radius compensation number. Example: T0303 indicates the choice of No. 3 knife and No. 3 tool length compensation value and the tool nose arc radius compensation value. T0300 means cancel tool compensation.

4. M function M00: The program is paused. The NC start command (CYCLE START) can be used to keep the program running.

M01: The schedule is paused. It is similar to M00, but M01 can be selected by machine tool "optional stop button".

M03: The spindle rotates clockwise;

M04: spindle rotates counterclockwise;

M05: spindle rotation stopped;

M08: Coolant on;

M09: Coolant off;

M30: The program stops and the program is reset to the starting position.