Unique G Codes

7/30/2019 Unique G Codes

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HAAS UNIQUE G-CODES


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G12/13 - CIRCULAR POCKET MILLING

G51 - SCALING

G53 - NON-MODAL MACHINECOORDINATE SYSTEM

G68 - ROTATION

G101 - MIRROR IMAGE G150 GENERAL PURPOSE POCKET

MILLING

UNIQUE MILL G-CODES


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OVERVIEW

Description of Codes

Code Format Effects of Settings

Unique Features

Examples


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G12/G13-CIRCULAR

POCKET MILLING (cont)

G12 and G13 are Non-modal Cutter Compensation is included

in this routine Use D00 to ignore tool offset Use I without K and Q for small

pockets or holes When using K and Q, only K

should be the radius of thedesired finished pocket

Position cutter in a previousblock or add an X and Y to theG12/G13 line


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G12 Example using I

(Finished Radius)

O0010 ;

T1 M06 ;

G90 G54 G00 X1.0 Y1.0 ;

S1500 M03 ;

G43 Z0.1 H1 M08;

G12 Z-0.5 I0.4 D01 F15. ;

G00 Z0.1 M09 ;

G28 G91 Y0 Z0 ;

M30 ;

Only one pass is required for

this example, so there is only

an I value (circle radius) in the

G12 line. G12 will use

conventional rather thanclimb millin

We want to mill a 0.8 diameter

0.5 deep pocket using a 0.5

endmill. The picture shows the

tool path for the code given.


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G13 Example

using I, K, Q

O0010 ;T1 M06 ;G90 G54 G00 X1.0 Y1.0 ;S1500 M03 ;G43 Z0.1 H1 M08;G12 G91 Z-0.5 I0.3 K1.5 Q0.3

D01 F15. L3;G90 ;G00 Z0.1 M09 ;G28 G91 Y0 Z0 ;M30 ;

This example requires more

passes in both the radius and

depth so K, Q and L (and a

G91) are used in addition to I.

We want to mill a 3.0 diameter

1.5 deep pocket using a 0.5endmill.

As seen in the picture, the first pass

is the I value (0.3). Additional

passes of Q increments (also 0.3) are

made until the full radius (K1.5) is cut.

Then the tool will move down in Z

another 0.5 and repeat the process.

The G13 cycle will repeat three times(L3) to produce a depth of 1.5


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G51-SCALING

Used to proportionally increase ordecrease X, Y, Z, I, J, K, or Rvalues in subsequent lines ofcode

G51 [X] [Y] [Z] [P] X - Optional X-axis center of scalingY - Optional Y-axis center of scaling Z - Optional Z-axis center of scaling P - Optional scaling factor, 3 place

decimal from 0.001 to 8383.000 With G51, you can easily create

different size parts by justchanging the P value.

G50 - Cancel ScalingThis is an optional feature along with G68 - Rotation.


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G51-SCALING(cont)

Setting 71- If P is not used, Setting 71is the default scaling factor. G51 X1. 5 Y1.0 (Scaling center is at X1.5,

Y1.0 and the scale factor is determined bySetting 71)

If X, Y, or Z are not used, the currentwork coordinate is used as thescaling center G00 X1.0 Y2.0

G51 P2. (Scaling center is at X1.0, Y2.0with a scale factor of 2.)

The factory default for setting 71 is 1.0,

meaning no scaling would take place.


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G51-SCALING(Example)

O0010 ;T1 M06 ;G54 G90 G00 X0 Y0 ;G43 Z0.1 H1 ;S500 M03 ;

G51 P2. ; (Scale factor of 2.)M97 P10 ;G28 G91 Y0 Z0 ;M30 ;N10 G00 X1. Y1. ;G01 Z-0.5 F15. ;X2. F20. ;Y2. ;G03 X1. R0.5 ;G01 Y1. ;G00 Z0.1 ;M99 ;

(Originalgeometry)

Take geometry shown by dashed line and

double the size. Use the original work

coordinate origin as the scaling center.

= Work coordinate origin= Center of scaling

Z values will also be doubled, sodepth of pocket will be -1.0.


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G51-SCALING(Example 2)

O0010 ;

T1 M06 ;

G54 G90 G00 X0 Y0 ;

G43 Z0.1 H1 ;

S500 M03 ;

G51 X1.5 Y1.5 P2.;M97 P10 ;

G28 G91 Y0 Z0 ;

M30 ;

N10 G00 X1. Y1. ;

G01 Z-0.5 F15. ;X2. F20. ;

Y2. ; G03 X1. R0.5 ;

G01 Y1. ;

G00 Z0.1 ;

M99 ;

(Originalgeometry)

Take geometry shown by dashed line and

double the size. Use a different work

coordinate as the scaling center.

= Work coordinate origin= Center of scaling

(Scaling centerX1.5 Y1.5)


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G53-NON-MODAL

COORDINATE SYSTEM

Cancels existing work coordinatesystem

Can be used to return spindle ortable to machine zero G53 Y0. Moves table to machine zero in Y

Must be used with a G49 if you havea Z value (G49 cancels tool offset)

G53 G49 Z0. Returns spindle to machine zero

An alternative to G28 G91 Z0; With G28 you must remember to add a

G90 afterwards

With G53 you stay in G90 modeThis is a standard feature.


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G68-ROTATION(cont)

Setting 72 - If R is not included inthe G68 line, Setting 72 is thedefault angle of rotation

Setting 73 - Must be on to have therotational value incrementallychange in G91 mode

Can be combined with Scaling -

Scaling should be activated first Cutter Comp should be turned on

after G51 or G68 commands andturned off before G50 and G69.

The factory default of Setting 72 is 0.0.


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G68 - ROTATION

(Example)

O0010 ;T1 M06 ;G54 G90 G00 X0 Y0 ;G43 Z0.1 H1 ;S500 M03 ;M97 P10 L8;

G69 M09 ;G28 G91 Y0 Z0 ;M30 ;N10 G91 G68 X0 Y0 R45. ;G90 ;G00 X1. Y1. Z0.1 ;G01 Z-0.5 F15. M08 ;

X2. F20. ;Y2. ;G03 X1. R0.5 ;G01 Y1. ;G00 Z0.1 ;M99 ;

We will take one of the arched windows

and rotate it around the origin in 45

degree increments.

= Work coordinate origin

= Center of scaling

(Windowgeometry)

By altering the L and R in the underlined blocks you can varythe number of windows cut.

(Rotate 45)

(Pocket routine is

done 8 times.)


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O0010 ;T1 M06 ;G54 G90 G00 X0 Y0 ;G43 Z0.1 H1 ;S500 M03 ;M97 P10 L6;

G69 M09 ;G28 G91 Y0 Z0 ;M30 ;N10 G91 G68 X0 Y0 R60. ;G90 ;G00 X-0.4911 Y2.9062 ;G01 Z-0.5 F15. M08 ;

G02 X0.4911 Y2.9062 I0.4911 J0.0938;G01 X0.1228 Y0.9774 ;G02 X-0.1228 Y0.9766 I-0.1228 J0.0234;G01 X-0.4911 Y2.9062G00 Z0.1 ;M99 ;

We will take a pocket that is

uniform around the X-axis, and

rotate it around the origin in 60

degree increments.

= Work coordinate origin

= Center of scaling

(Pocketgeometry)

Note that in this and the last example we included an X and Y inthe G68 line to define the center of rotation.

(Rotate 60)

G68 - ROTATION(Example 2)


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G101-MIRROR IMAGE

Used to produce a mirror image of a

sequence of codes around an X, Y,

Z, A or B axis

G101 [X] [Y] [Z] [A] [B]

At least one axis must be specified

Any value given will be ignored

G100 cancels mirror image

You can mirror image more than one axis at a time.

This is an standard control feature.


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Setting 45 - Mirror image X-axis Setting 46 - Mirror image Y- axis

Setting 47 - Mirror image Z-axis

Setting 48 - Mirror image A-axis

Setting 80 - Mirror image B-axis

These settings activate mirrorimaging without using G101

If only one axis is mirrored, climbmilling will be changed toconventional milling (i.e. direction oftravel will be reversed). Cutter

compensation is also reversed.When you use these settings, mirror imaging will be

active until you manually turn the settings off.

G101-MIRROR IMAGE(cont)


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G101-MIRROR IMAGE(Example)

In this example, we will mirrorthe Pocket on the right in the X-

axis, producing a similar pocket

on the left.

O0010 ;T1 M06 ;G54 G90 G00 X0 Y0 ;G43 Z0.1 H1 ;S500 M03 ;M97 P20 ;N10 G101 X0 ;

M97 P20 ;G100 ;G00 Z0.1 ;M09 ;G28 G91 Y0 Z0 ;M30 ;N20 G00 X-0.4653 Y0.052 ;G01 Z-0.5 F15. M08 ;

G01 X-1.2153 Y0.552 ;G03 X-1.3059 Y0.528 R.0625 ;G01 X-1.5559 Y0.028 ;G03 X-1.5559 Y-0.028 R.0625 ;G01 X-1.3059 Y-0.528 ;G03 X-1.2153 Y-0.552 R.0625 ;G01 X-0.4653 Y-0.052 ;G03 X-0.4653 Y0.052 R.0625 ;M99 ;

Because the pocket is symmetrical around the

X-axis, we could add a Y0 in line N10 and not

change the part. This would allow us to ClimbMill on the second pocket as well as the first.

(Pocketgeometry)


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G101-MIRROR IMAGE(Example 2)

O0010 ;T1 M06 ;G54 G90 G00 X0 Y0 ;G43 Z0.1 H1 ;S500 M03 ;M97 P10 ;N10 G101 Y0 ; (Mirror in Y-axis)M97 P20 ;G28 G91 Y0 Z0 ;M30 ;N20 G00 X2. Y2. ;G01 Z-0.5 F15. ;X4. F20. ;Y4. ;G03 X2. R1. ;G01 Y2. ;G00 Z0.1 ;M99 ;

(Originalgeometry)

In this example, we will mirror the pocket

on top, in the Y-axis, producing a similar

pocket on the bottom.

In this example, Climb Milling on the first pocket is changed

to Conventional on the second pocket.


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G101-MIRROR IMAGE(Example 3)

O0010 ;T1 M06 ;G54 G90 G00 X0 Y0 ;G43 Z0.1 H1 ;S500 M03 ;M97 P10 ;N10 G101 Y0 X0; (Mirror in X-M97 P20 ; and Y- axes)G28 G91 Y0 Z0 ;M30 ;N20 G00 X2. Y2. ;G01 Z-0.5 F15. ;

X4. F20. ;Y4. ;G03 X2. R1. ;G01 Y2. ;G00 Z0.1 ;M99 ;

If we add an X0 to line N10, it will

produce results shown above.

Climb Milling will also take place

on the second pocket.


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G150-POCKET MILLING

Used to mill a pocket by defining only theoutside shape of the pocket

G150 G41* P F D I J K Q RX Y Z [L] [S] P - Number of Sub-program defining pocket(required)

F - Feedrate D - Tool diameter offset selection

I - X-axis cut increment (I or J is required)

J - Y-axis cut increment

K - Finish cut allowance

Q - Incremental Z-axis cut depth per pass (>0) (reqiuired) R - R plane position (required)

X & Y - Position of starting hole

Z - Final depth of pocket

L - Optional repetition count for additional pockets

S - Optional spindle speed* G42, Cutter Comp Right, is also permissibleThis is an standard control feature.


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G150-POCKETMILLING (cont)

There is no finishing pass in the Z depth.

Q is a positive value for the amount ofincremental step down in Z for deeper pockets.

You cannot use both I and J. If you use L for additional pockets, you must have

a G91 and incremental positioning in the G150line You will also need to drill all your clearing holes prior to

the G150 line

The finishing pass, K, is taken at the full depth (Z)of the pocket.

It is also possible to program an island within apocket. (See the Operators Manual for an example ofthis.)

You can not use a G68 with G150


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G150-POCKET MILLING(Example)

In this example, we will mill the pocket

shown using steps along the X-axis of

0.3(I). We will take a maximum depth

of cut of 0.2(Q). (The first pass will

only be 0.1). We will leave 0.02(K) for

a finishing pass. The geometry is in

program number O0200(P)

O0010 ;T1 M06 ;G54 G90 G00 X3.0 Y3.5 ;G43 Z0.1 H1 ;S2500 M03 ;N10 G81 Z-0.5 R0.1 F25. ;T2 M06 ;G43 Z0.1 H2 ;S2000 M03 ;G150 P200 G41 X3.0 Y3.5 Z-0.5 F30. R0.1Q0.2 I0.3 K0.02 ;G00 Z0.1 M09 ;G28 G91 Y0 Z0 ;M30 ;

O0200 ;G01 X2.0 ;Y2.0 ;X4.0 ;

Y4.0 ;G03 X2.0 Y4.0 R1.0 ;G01 Y3.5 ;M99 ;

(Sub-program forPocketgeometry)

Notice that there is a drill cyclein line N10 for a clearing hole.


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Visit our web site,

http://www.haascnc.com/training

to view Information Modules on

other features of the Haas

Control. You can also download

training booklets on the Haas

Control and CNC Programming.


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Documents

Unique G Codes