CNC Programming Examples - Beginner Level

CNC Mill Example Program G01 G02 G03 G90 G91

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A cnc mill program for cnc machinists programmers, who have started to learning basic cnc programming techniques.

CNC Mill Example Program

CNC Program

N40 G90 G00 X0 Y0
        N50 G01 X-10 Y-20 R8         (P1)
        N60 G01 X-50 R10             (P2)
        N70 Y10                      (P3)
        N80 X-19.97 Y25.01           (P4)
        N90 G03 X7.97 Y38.99 R18     (P5)
        N100 G01 X30 Y50             (P6) 
        N110 G91 X10.1 Y-10.1        (P7)
        N120 G90 G02 X59.9 Y20.1 R14 (P8)
        N130 G01 X70 Y10             (P9)
        N140 Y-20 R10                (P10)
        N150 X50                     (P11)
        N160 G03 X30 R10             (P12)
        N170 G01 X10 R8              (P13)
        N180 X0 Y0

G M S T Codes Explanation

Code	Description
G00	Rapid traverse
G01	Linear interpolation
G02	Circular interpolation CW
G03	Circular interpolation CCW
G90	Absolute command
G91	Increment command

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G02 G03 Example CNC Mill

G02 G03 Circular interpolation CNC mill example program.

G02 G03 Example CNC Mill

CNC Part Program

G0 X30 Y-30             (P1)
            G1 Y22.67               (P2)
            G3 X24.07 Y26.18 R4     (P3)
            G2 X-18.27 Y23.46 R50   (P4)
            G3 X-23.46 Y18.27 R4    (P5)
            G2 X-23.46 Y-18.27 R50  (P6)
            G3 X-18.27 Y-23.46 R4   (P7)
            G2 X24.07 Y-26.18 R50   (P8)
            G3 X30 Y-24.67 R4       (P9)
            G1 X33

G M S T Codes Explanation

Code	Description
G0	Rapid traverse
G1	Linear interpolation
G2	Circular interpolation CW
G3	Circular interpolation CCW
M30	End of program (Reset)

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Multiple Arc CNC Mill Program G2 G3 I J

CNC milling machine program which combines/joins multiple arcs.

Multiple Arc CNC Mill Program G2 G3 I J

CNC Part Program

N10 M6 T1 G43 H1 M3
                N15 S500 F120
                N20 G0 X0 Y0              (P1)
                N25 G1 Y20                (P2)
                N30 G3 X-15 Y35 I-15 J0   (P3)
                N35 G2 X-45 Y35 I-15 J0   (P4)
                N40 G3 X-60 Y20 I0 J-15   (P5)
                N45 G1 Y0                 (P6)   
                N50 G1 X0                 (P1) 
                N55 M30

G M S T Codes Explanation

Code	Description
G0	Rapid traverse
G1	Linear interpolation
G2	Circular interpolation CW
G3	Circular interpolation CCW
G43	Tool length compensation + direction
M3	Spindle start forward CW
M6	Tool change
M30	End of program (Reset)
T	Tool
S	Speed
F	Feed

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Haas Corner Rounding and Chamfering Example G01 C R

Haas Corner Rounding and Chamfering

Haas CNC program example to show how Chamfer and Corner Radius can be programmed.

Haas Chamfering

To program Chamfer

N10 G01 X20 Y30 ,C3

Haas Corner Rounding

To program Radius

N10 G01 X20 Y30 ,R3

Haas Corner Rounding and Chamfering Example

Haas CNC Program

O1234 (Corner Rounding and Chamfering Example);
                    T1 M6;
                    G00 G90 G54 X0. Y0. S3000 M3; (P1)
                    G43 H01 Z0.1 M08;
                    G01 Z-0.5 F20.;
                    Y40. ,R10.;            (P2)    
                    X50. ,C5.;             (P3) 
                    Y0.;                   (P4)
                    G00 Z0.1 M09;
                    G53 G49 Z0.;
                    G53 Y0.;
                    M30;

Haas G M S T Codes

Code	Description
G00	Rapid Motion
G01	Linear Interpolation Motion
G43	Tool Length Compensation +
G49	G43/G44 Cancel
G53	Non-Modal Machine Coordinate Selection
G54	Select Work Coordinate System l
G90	Incremental Programming
M3	Spindle On, Clockwise (S)
M6	Tool Change (T)
M08	Coolant On
M09	Coolant Off
M30	Program End and Reset
S	Spindle speed
T	Tool

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CNC Mill Subprogram Example Joining Multiple Arcs G02 G03 G41

CNC milling program to describe how two or more radii can be joint together in a cnc mill program.

CNC Mill Subprogram Example

CNC Part Program

                        N10 T1 H1 M6 G43 M3
                        N20 F150 S250
                        N30 G0 X-21 Y50 Z0.5
                        N40 G0 Z0
                        N50 M98 P040050
                        N60 G49
                        N70 G0 Z50
                        N80 M30

Subprogram

                        O0050
                        N10 F160 S400
                        N20 G0 Z-2.5 G91
                        N30 G1 G90 X5 Y50 G41      (P1)
                        N40 G2 X22 Y85.23 I45 J0   (P2)
                        N50 G3 X78 Y85.23 R45      (P3)
                        N60 G2 X78 Y14.77 R45      (P4) 
                        N70 G3 X22 Y14.77 R45      (P5)
                        N80 G2 X5 Y50 R45          (P1)
                        N90 G0 G40 X-21
                        N100 M99

G M S T Codes Explanation

Code	Description
G00	Rapid traverse
G01	Linear interpolation
G02	Circular interpolation CW
G03	Circular interpolation CCW
G40	Cutter compensation cancel
G41	Tool nose radius compensation left
G43	Tool length compensation + direction
G49	Tool length compensation cancel
G90	Absolute command
G91	Increment command
M03	Spindle start forward CW
M06	Tool change
M30	End of program (Reset)
M98	Subprogram call
M99	End of subprogram
T	Tool
S	Speed
F	Feed

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CNC Mill Program G91 G41 G43

CNC milling program examples shows the use of G91 G41 G43 G-codes.

CNC Mill Program G91 G41 G43

CNC Part Program

N05 G54
                            N10 M6 T1 G43 H1 M3
                            N15 S500 F120
                            N20 G0 X-22 Y-22
                            N25 Z-3
                            N30 G1 X3 Y6 G41 H2   (P1)
                            N35 G91 X0 Y24        (P2)
                            N40 X12 Y9            (P3)
                            N45 X36               (P4)
                            N50 Y-24              (P5)
                            N55 X-21              (P6) 
                            N60 G90 X3 Y6         (P1)
                            N65 G0 X-21 G40

G M S T Codes Explanation

Code	Description
G00	Rapid traverse
G01	Linear interpolation
G40	Cutter compensation cancel
G41	Tool nose radius compensation left
G43	Tool length compensation + direction
G54	Workpiece coordinate system 1 selection
G90	Absolute command
G91	Incremental command
M06	Tool change
T	Tool
S	Speed
F	Feed

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CNC Pocket Milling Program Example – Peck Milling

CNC milling program example which shows how a cnc program can be made to machine Pockets on a cnc mill.
This program example uses Peck milling to cut material to machine a rectangular and one round pocket.

Contents

• CNC Pocket Milling Program Example
  • Main Program
  • Subprogram
  • Explanation

CNC Pocket Milling Program Example

Main Program

Milling cutter diameter: 10mm

                                N05 G55
                                N10 M6 T2 H3 G43 M3
                                N15 S1000 F60
                                N20 G0 X9 Y9 Z1
                                N25 G1 Z0
                                N30 M98 P030035
                                N35 G0 Z1 G90
                                N40 X42 Y38
                                N45 G1 Z-2 F30
                                N50 X47 F300
                                N55 G3 X47 Y38 I-5 J0
                                N60 G0 Z100
                                N65 G49
                                N70 M30

Subprogram

O0035
                                N05 G1 Z-2 G91 F30
                                N10 X10 F100
                                N15 Y36
                                N20 X-10
                                N25 Y-36
                                N30 M99

Explanation

Although this cnc mill program is self explanatory

M98 P030035

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CNC Milling Program Example G03 G90 G91

CNC milling program example, which illustrates how a cnc program can be easily converted from G90 Absolute program mode to G91 Incremental program mode.

CNC Milling Program Example

G90 Absolute Program	G91 Incremental Program
N10 T1 M6 M3 G43 N10 T1 M6 M3 G43 N15 S2000 F80 N20 G0 X10 Y10 Z1 (P1) N25 F30 N30 G1 Z-2 N35 X25 F80 (P2) N40 G3 X25 Y20 I0 J5 (P3) N45 G1 X10 (P4) N50 Y30 (P5) N55 G0 Z100 G49 N60 M30	N15 S2000 F80 N20 G0 X10 Y10 Z1 N25 F30 N30 G1 Z-2 N35 G91 X15 F80 N40 G3 X0 Y10 I0 J5 N45 G1 X-15 N50 Y10 N55 G90 G0 Z100 G49 N60 M30

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Reference books

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