3 G Codes Part 1 CNC

8/10/2019 3 G Codes Part 1 CNC

1/23

1995

UMY

UniversitasMuhammadiyah

Yogyakarta

www.umy.ac.id

CNC/CAM#3 G Codes Part 1

Tutik Sriani, S.T., M.Eng, PhD

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2/23

1995

Word Characters

2

Address DefinitionN Address if block number

G Preparatory function

X, Y, Z Positional data

I, J, K Interpolation parameters

F Feed

S Spindle speed

T Tool number

D Tool offset number

M Miscellaneous function

H Auxiliary function

SPOS/A Spindle position

L Subprogram call

P Number of program passes

Address DefinitionR Arithmetic parameter

: Main block

AX Axis value (variable axis program)

ACC Axial acceleration

FA Axial feed

FL Axial feed limit

IP Interpolation parameter

OVRA Axial override

PO Polynomial coefficient

POS Positioning axis

POSA Positioning axis across block

boundary


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1995

Operators

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Operator Definition

+ Addition

- Subtraction

* Multiplication

/ Division (ex: = 0.75): Chain operator

Sin() Sine

COS() Cosine

TAN() Tangent

ASIN() Arcsine

SQRT() Square root

ABS() Absolute number

POT() 2ndpower (square)

TRUNC() Truncate to integer

Address Definition

ROUND() Round to integer

LN() Natural logarithm

EXP() Exponential function

== Equal to Not equal to

> Greater than

< Less than

>= Greater than or equal to


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1995

Some of G Codes for Milling

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5/23

1995

Some of G Codes for Milling

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6/23

1995

Some of G Codes for Turning

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7/23

1995

Some of G Codes for Turning

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1995

Plane Designation

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It is advisable to define the working plane at the beginning of the program. The working

plane must be specified when the tool path compensation G41/G42 is called so that the

control can correct the tool length and radius. In the initial setting, G17(X/Y plane) is defined

for millingand G18(Z/X plane) is defined for turning.


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1995

0. Positional Data

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Seq. Code Explanation

N01 G90G00 X45 Y60 T1 S2000 M3 Absolute dimensioning, rapid traverse to YZ, tool, spindle

on clockwise

N02 G21G01 Z-5 F500 Enter positions in metric (mm), tool infeed

N03 G02 X20 Y35 I=AC(45) J=AC(35) Circle center point in absolute dimensions

(0,0) : G90(absolute) or

G91(incremental)

Dimension: G20/G70(imperial) or G21/G71(metric)


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1995

1. G00, Rapid Traverse Movement

Program: G0 X Y Z

X,Y,Z: endpoint in Cartesian coordinates

G00 is used for approaching starting positions or tool

change locations, retracting the tool, etc.

Use the rapid traverse movements to position the tool

rapidly, to travel round the workpiece or to approach tool

change locations. This function is not suitable for workpiece machining!

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11/23

1995

1. G00, Milling Sample

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Seq Code Explanation

N01 G90 G 21 S400

M3

Absolute dimensioning,

metric, spindle on CW

N02 G00X30 Y20 Z2 Approach start position

N03 G01 Z-5 F1000 Tool infeed

N04 X80 Y 65 Travel on straight line

N05 G00Z2 Retract tool

N06 G00X-20 Y100

Z100 M30

Retract tool, end of

program


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1995

1. G00, Turning Sample

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N01 G90 G21 S400 M3 Absolute dimensioning,


N02 G00X25 Z5 Approach start position

N03 G01 G94 Z0F1000

Tool infeed

N04 G95 Z-7.5 F0.2

N05 X60 Z-35 Travel on straight line

N06 Z-50

N07 G00X62

N08 G00X80 Z20 Retract tool

N09 M30 End of program


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1995

2. G01, Linear Interpolation (Milling)

Program: G01 X Y Z F

X,Y,Z: endpoint (Cartesian), F = feed-rate (mm/min)

1313


N01 G90 G21 Absolute dimensioning,

metric

N02 G17 S400 M3 Select working plane

(X/Y), spindle CW

N03 G00 X20 Y20 Z2 Approach start position

N04 G01Z-2 F40 Tool infeed

N05 X80 Y80 Z-15 Travel along inclined

straight line

N06 G00 Z100 M30 Retract to tool change

location, end of program


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1995

2. G01, Linear Interpolation (Straight-Turning)


N01 G90 G21 S400 M3 Absolute dimensioning,


N02 G00X25 Z5 Approach start position

N03 G01G94 Z0F1000

Tool infeed

N04 G95Z-7.5 F0.2

N05 X60 Z-35 Travel on straight line

N06 Z-50

N07 G00X62

N08 G00X80 Z20 Retract tool

N09 M30 End of program


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1995

Class Exercise #1.1-1.2

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1995

3. G02/G03, Circular Interpolation

Program: G02/G03 X Y Z I J K

G02 Travel on a circular path in clockwise direction

G03 Travel on a circular path in counterclockwise direction

X Y Z End point in Cartesian coordinates

I J K Circle center point in Cartesian coordinates (in X,Y,Z)

Enables machining full circle/arc.

The control needs the working plane parameter (G17 to G19) inorder to calculate the direction of rotation for the circle G02 isclockwise/G03 is counterclockwise. It is generally advisable tospecify the working plane.

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1995

3.1 G02/G03 with Center & End Point

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N01 G00 X67.5 Y80.211 Positioning @start point

N02 G03X17.203Y38.029 I17.5

J30.211 F500

Infeed CCW, XY @endpoint, IJ center point

Incremental mode:

Absolute mode:



N02 G03X17.203

Y38.029 I=AC(50)

J=AC(50)

Infeed CCW, XY @end

point, IJ center point

Able to mill full circle

MILLING


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1995

3.1 G02/G03 with Center & End PointTURNING


N01 G00 X12 Z0 Positioning @start point

N02 G01 X40 Z-25 F0.2 Tool infeed

N03 G03X70 Z-75 I-3.335 K-29.25

Tool infeed CCW, XZ@end point, IK@center

N04 G1 Z-95 Straight turning

Incremental mode:

Absolute mode:


N01 G00 X12 Z0 Positioning @startpoint


N03 G03X70 Z-75

I=AC(33.33) K=AC(54.25)

Tool infeed CCW, XZ

@end, IK@center

N04 G01 Z-95 Straight turning


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1995

3.2 G02/G03 with Radius & End Point

1919



N02 G03X17.203Y38.029 CR=34.913

F500

Infeed CCW, XY @endpoint, circle radius value

Can not mill full circle

MILLING


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1995

3.3 G02/G03 with Arc Angle & End Point/Center Point

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N02 G03X17.203Y38.029

AR=140.134 F500

Infeed CCW, XY @endpoint, arc angle value



N02 G03I17.5 J30.211

AR=140.134 F500

Infeed CCW, IJ @center

point, arc angle value

MILLING


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1995

3.3 G02/G03 with Arc Angle & End Point/Center Point

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TURNINGSeq Code Explanation



N03 G03X70 Z-75

AR=135.944

Tool infeed CCW, XZ

@end point, arc angle




N03 G03I-3.335 K-29.25

AR=135.944

Tool infeed CCW, IK

@center point, arc angle


N01 G00 X12 Z0 Positioning @start


N03 G03I=AC(33.33)

K=AC(-54.25)AR=135.944

Tool infeed CCW, IK

@center point


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1995

Class Exercise #1.3-1.4

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3 G Codes Part 1 CNC

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