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Showing posts with label CNC Programming Examples. Show all posts
Showing posts with label CNC Programming Examples. Show all posts

CNC Programming Examples - Bolt Hole Circle

Fanuc G72.1 G72.2 Figure Copy Program Example (Bolt Hole Circle)





This CNC program example shows how both G72.1 and G72.2 figure copy functions can call one-another in one part program, read Programming Notes below carefully.
Contents

* Best ebooks for CNC programming: 
CNC Programming Basics 
G-Code and M-Code 
CNC programming 
G-Code Reference 
CNC Machine Tutorial 

Programming

Fanuc G72.1 Rotational Copy

Using G72.1 Rotational Copy G-code a figure specified by a subprogram can be repeatedly produced with Rotational movement.
Read G72.1 definition with program example Fanuc G72.1 Rotational Copy (Figure Copy Function CNC Mill)

Fanuc G72.2 Linear Copy

Using G72.2 Linear Copy G-code a figure specified by a subprogram can be repeatedly produced with Linear movement.
Read G72.2 definition with program example Fanuc G72.2 Linear Copy (Figure Copy Function CNC Mill)

Fanuc G81 Drilling Cycle

G81 drilling cycle is used for simple drilling/spot drilling operations.
Read G81 drilling cycle definition with program examples Fanuc G81 Drilling Cycle

Programming Notes

Specifying two or more commands to copy a figure
  1. G72.1 cannot be specified more than once in a subprogram for making a rotational copy (If this is attempted, alarm PS0900 will occur).
  2. G72.2 cannot be specified more than once in a subprogram for making a linear copy (If this is attempted, alarm PS0901 will occur).
  3. In a subprogram that specifies rotational copy, however, linear copy can be specified. Similarly, in a subprogram that specifies linear copy, rotational copy can be specified.

Fanuc G71.2 G72.2 Program Example


Main program
        O4000 ;
        N10 G90 G00 G17 X240. Y230. Z100. ; (P0)
        N20 G72.1 P4100 X120. Y120. L8 R45. ;
        N30 G80 G00 X240. Y230. ; (P0)
        N40 M30 ;
Sub program Rotation copy (G72.1)
        O4100 N100 G72.2 P4200 I0 J20. L3 ;
        N200 M99 ;
Sub program Linear copy (G72.2 )
        O4200 N110 G90 G81 X120. Y180. R60. Z10. F200. ; (P1)
        N210 M99 ;

CNC Programming Examples - Drilling

Fanuc G72.1 G72.2 Figure Copy Program Example (Bolt Hole Circle)

* Best ebooks for CNC programming: 
CNC Programming Basics 
G-Code and M-Code 
CNC programming 
G-Code Reference 
CNC Machine Tutorial 

This CNC program example shows how both G72.1 and G72.2 figure copy functions can call one-another in one part program, read Programming Notes below carefully.

Programming

Fanuc G72.1 Rotational Copy

Using G72.1 Rotational Copy G-code a figure specified by a subprogram can be repeatedly produced with Rotational movement.
Read G72.1 definition with program example Fanuc G72.1 Rotational Copy (Figure Copy Function CNC Mill)

Fanuc G72.2 Linear Copy

Using G72.2 Linear Copy G-code a figure specified by a subprogram can be repeatedly produced with Linear movement.
Read G72.2 definition with program example Fanuc G72.2 Linear Copy (Figure Copy Function CNC Mill)

Fanuc G81 Drilling Cycle

G81 drilling cycle is used for simple drilling/spot drilling operations.
Read G81 drilling cycle definition with program examples Fanuc G81 Drilling Cycle

Programming Notes

Specifying two or more commands to copy a figure
  1. G72.1 cannot be specified more than once in a subprogram for making a rotational copy (If this is attempted, alarm PS0900 will occur).
  2. G72.2 cannot be specified more than once in a subprogram for making a linear copy (If this is attempted, alarm PS0901 will occur).
  3. In a subprogram that specifies rotational copy, however, linear copy can be specified. Similarly, in a subprogram that specifies linear copy, rotational copy can be specified.

Fanuc G71.2 G72.2 Program Example


Main program
O4000 ;
        N10 G90 G00 G17 X240. Y230. Z100. ; (P0)
        N20 G72.1 P4100 X120. Y120. L8 R45. ;
        N30 G80 G00 X240. Y230. ; (P0)
        N40 M30 ;
Sub program Rotation copy (G72.1)
O4100 N100 G72.2 P4200 I0 J20. L3 ;
        N200 M99 ;
Sub program Linear copy (G72.2 )
O4200 N110 G90 G81 X120. Y180. R60. Z10. F200. ; (P1)
        N210 M99 ;

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Fanuc G81 Drilling Cycle

G81 drilling cycle is used for simple drilling/spot drilling operations.

Syntax

G81 X... Y... Z... R... K... F...
Parameter Description
X Hole position in x-axis.
Y Hole position in y-axis.
Z Depth, tool will travel with feed to Z-depth starting from R plane.
R Position of the R plane.
K Number of cycle repetitions (if required) .
F Feedrate.
Once G81 drilling cycle is defined, the canned cycle is repeated at every X-Y position in sequential blocks. So G81 drilling cycle must be cancelled with G80.

Usage

            N30 G81 X10 Y30 Z-17 R2 F75
            N40 Y10
            N50 X30
            N60 Y30
            N70 X90
            N80 Y10
            N90 G80


In the above example drilling will start with G81 drilling cycle at X10 Y30, so first drill will be at X10 Y30, then second at Y10, third at X30, fourth at Y30, fifth at X90 and the last one at Y10, because next block have G80 code, so drilling cycle will no more be repeated.

Working

Here is briefly described how G81 drilling cycle operates,
1- Rapid traverse to the specified x,y axis position (drilling position).
2- Rapid traverse to the R plane position.
3- Drilling with specified Feed from R-plane position to Z-depth position.
4- Rapid traverse to Initial level or R-plane depends on G98, G99 modes.

G81 drilling cycle working

G98 G99 Modes

After completing drilling depth the return is made with Rapid feed, the return height can be controlled through using G98 or G99.
G98 Drill will return to the Initial level
G99 Drill will return to R-plane.
G98, G99 can be used multiple times during G81 drilling cycle.

Example

            N30 G81 X10 Y30 Z-17 R2 F75
            N40 Y10
            N50 G98 X30
            N60 G99 Y30
            N70 X90
            N80 Y10
            N90 G80

Repeat Drilling

With G81 drilling cycle drilling operation can be repeated multiple times. The drilling is repeated K times when that parameter is given with G81 drilling cycle.
Repeat drilling is normally used with G91 Incremental mode, and a good example of repeated drilling is Grid-plate drilling. the example for repeat drilling  is given below.

Working Examples


G81 Drilling Cycle Example
            N10 T1 M06
            N20 G90 G54 G00 X30 Y25
            N30 S1200 M03
            N40 G43 H01 Z5 M08
            N50 G81 Z-10 R2 F75
            N60 X80 Y50
            N70 G80 G00 Z100 M09
            N80 M30

G98 G99 Example


G81 drilling cycle usage with G98 G99
            N10 M06 T1
            N20 G90 G00 X12.5 Y10 Z12 S1000 M03
            N30 G99 G81 X12.5 Y10 Z-17 R2 F75
            N40 Y30
            N50 G98 X57.5
            N60 G99 Y10
            N70 G91 G80 G28 X0 Y0 Z0 M05
            N80 M30

Repeat Drilling Example


Repeat drilling with G81 Drilling Cycle
            T1 M6
            G00 G90 G40 G21 G17 G94
            G54 X0 Y0 S1000 M03
            G43 H1 Z100
            Z3
            G81 G99 G91 X20 Y20 R3 Z-20 K3 F100 M08
            G80
            G00 G90 Z100
            M30
OR
            T1 M6
            G00 G90 G40 G21 G17 G94
            G54 X20 Y20 S1000 M03
            G43 H1 Z100
            Z3
            G81 G99 R3 Z-20 F100 M08
            G91 X20 Y20 K2
            G80
            G00 G90 Z100
            M30
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Fanuc G82 Drilling Cycle

G82 drilling cycle is also called G82 counter boring cycle.
G82 is a normal drilling cycle the only difference is that it dwell for specified time at the bottom of the hole, normally used for accurate depth drilling.

Syntax

G82 X... Y... Z... R... P... F... K...
Parameter Description
X Hole position in x-axis.
Y Hole position in y-axis.
Z Depth, tool will travel with feed to Z-depth starting from R plane.
R Position of the R plane.
P Dwell at the bottom of hole.
K Number of cycle repetitions (if required) .
F Feedrate.

Usage

                N30 G82 X10 Y30 Z-17 R2 P1000 F75
                N40 Y10
                N50 X30
                N60 Y30
                N70 G80


Once G82 drilling cycle is specified with it’s parameters in a program block, this will keep drilling at every axis movement, until cycle is ended with G80

Working

How G82 drilling cycle works
1- Rapid traverse to x, y position
2- Rapid traverse to R-plane position
3- Drilling with feed from R-plane to Z-depth position.
4- Dwell for specified time at hole bottom.
5- Rapid traverse to R-plane or Initial-level depends on G99, G98 mode.

G82 drilling cycle working

G98 G99 Modes

How G82 drilling cycle behaves upon G98 or G99 mode,
G98 Drill will return to the Initial level
G99 Drill will return to R-plane.
For a working example see G81 drilling cycle.

Example

                N30 G82 X10 Y30 Z-17 R2 P2000 F75
                N40 Y10
                N50 G98 X30
                N60 G99 Y30
                N70 X90
                N80 Y10
                N90 G80

Repeat Drilling

If K parameter value is given with G82 drilling cycle, then drilling will repeat the number of times given with K. An effective use of repeat drilling is while drilling multiple same distance holes, this way G82 cycle is used in G91 incremental mode. See G81 drilling cycle for repeat drilling example.

Working Example


G82 drilling cycle example
                N10 T1 M06
                N20 G90 G54 G00 X30 Y25
                N30 S1200 M03
                N40 G43 H01 Z5 M08
                N50 G82 Z-10 R2 P1000 F75
                N60 X80 Y50
                N70 G80 G00 Z100 M09
                N80 M30

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[CNC Programming Examples] U W CNC Lathe CNC Program Examples

U W CNC Lathe CNC Program Examples

Fanuc G71 Turning Cycle

G71 turning cycle is used for rough-material removal from a cnc lathe component. G71 turning cycle makes large diameter cutting easy. Cutting can be done in simple straight line or a complex contour can also be machined very easily.
Through G71 turning cycle parameters cnc machinists can control
  • Depth of cut.
  • Retract height.
  • Finishing allowance in x-axis and z-axis.
  • Cycle cutting-feed, spindle speed.

Programming

G71 U... R...
G71 P... Q... U... W... F... S...

Parameters

First block
Parameter Description
U Depth of cut.
R Retract height.
Second block
Parameter Description
P Contour start block number.
Q Contour end block number.
U Finishing allowance in x-axis.
W Finishing allowance in z-axis.
F Feedrate during G71 cycle.
S Spindle speed during G71 cycle.

G71 Turning Cycle Overview

  • G71 turning cycle cuts the whole contour repeatedly which is given in P Q blocks.
  • Depth of every cut can be controlled by first-block U value.
  • Second-block U W are the finishing allowances which can be given if you want to make a finish cut with G70 finishing cycle.
  • F is cutting feed and S is spindle speed (given in second-block) which are used during G71 turning cycle.
Note – The F and S given inside P Q block will not be used during G71 turning cycle, they are used with G70 finishing cycle if later called.

G71 Turning Cycle Working

N60 G71 U10 R10 
N70 G71 P80 Q90 U3 W0 F0.25
N80 G00 X60
N90 G01 Z-75
When G71 turning cycle is run the whole operation will be done in following sequence,
First-cut
1 – Tool will move in x-axis U (depth of cut) deep with programmed feed from starting-point.
2 – Tool will travel with feed in z-axis (destination point in z-axis is given in P Q blocks )
3 – Tool rapidly retracts R amount in both x-axis and z-axis (at 45 degrees).
4 – Tool rapidly travel in z-axis to start-point
Later-cuts
5 – Tool rapidly moves to last cut depth.
6 – Tool moves with feed in x-axis U deep (first-block U depth of cut).
7 – Tool with feed moves in z-axis (destination point given in P Q blocks).
8 – Tool rapidly retracts in x-axis and z-axis R amount (45 degrees).
9 – Tool rapidly moves to start-point only in z-axis.
This whole sequence of operation keep on going, until the destination point in x-axis is met.
If finishing allowance is given tool will not make the exact diameter and length given in P Q blocks but will leave that much allowance, This finishing allowance can be later machined by calling G70 finishing cycle.


Fanuc G71 Turning Cycle

Fanuc G71 Example

Here is a cnc part-program which shows how G71 turning cycle can be used, this is the program for the drawing given above
N50 G00 X106 Z5 M3 S800
N60 G71 U10 R10 
N70 G71 P80 Q90 U3 W0 F0.25
N80 G00 X60
N90 G01 Z-75
In this program G71 turning cycle will keep repeating the contour given inside P Q blocks shown below
N80 G00 X60
N90 G01 Z-75
These two cnc program blocks tell us that we want to remove material till X60 deep and in Z-75 in length.
The depth of cut is given in first-block U10 retract amount is also given R10.
Finishing allowance in x-axis is U3 but there is no finishing allowance given in z-axis W0.

G70 Finishing Cycle

If you programmed G71 turning cycle with finishing allowances then that finish allowances can be removed with G70 finishing cycle.
G70 finishing cycle repeats the whole contour the G71 way, but in just one-cut removing the finishing allowances.

Why Use G70 Finishing Cycle

As material can be removed with G71 turning cycle, but if you want a different cutting-feed and spindle speed for the last cut, then it is recommended that you use G70 finishing cycle.
G70 finishing cycle use F and S values which are given inside P Q programmed blocks. (G71 use F S values which are given inside G71 second block.)

Fanuc G70 Example

N50 G00 X106 Z5 M3 S800
N60 G71 U10 R10 
N70 G71 P80 Q90 U3 W0 F0.25
N80 G00 X60
N90 G01 Z-75 F0.15
N100 G00 X200 Z100
N110 G92 S1200
N120 T3 G96 S150 M03
N130 G00 X106 Z5
N140 G70 P80 Q90
N150 G00 X200 Z100
N160 M30

G70 G71 Example


G71 Rough Turning Cycle Example

O0004
G00 X200 Z10 M3 S800
G71 U2 R1 F200
G71 P80 Q120 U0.5 W0.2
N80 G00 X40 S1200
G01 Z-30 F100
X60 W-30
W-20
N120 X100 W-10
G70 P80 Q120
M30


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[CNC Programming Examples] Fanuc G76 Thread Cycle for Dummies

Fanuc G76 Thread Cycle for Dummies



Fanuc G76 Thread Cycle for Dummies
Fanuc G76 Thread Cycle for Dummies explains Fanuc G76 threading cycle briefly. Fanuc G76 gives cnc machinist full control over thread turning.
Fanuc G76 threading cycle has multiple parameters but the same way Fanuc G76 gives full flexibility in thread cutting.
This article is actually to help cnc machinists to easily navigate through multiple articles explaining Fanuc G76 threading cycle.
Below are quick links,
  • Fanuc G76 Threading Cycle
  • G76 Threading Cycle One Line Format for Fanuc 10/11/15T
  • Tapered Threading with Fanuc G76 threading cycle
  • Multi-Start Threading with Fanuc G76 threading cycle
  • Controlling Thread Infeed with Fanuc G76 threading cycle
  • How to Fully Control G76 Threading Cycle Number of Pass and Depth of Cut
For explanation of all the variations of Fanuc G76 see below
Contents
  • CNC Fanuc G76 Threading Cycle
  • One Line Format for Fanuc 10/11/15T
  • Tapered Threading
  • Multi Start Threads
  • Controlling Threading Infeed Angle
  • Controlling Number of Pass and Depth of Cut

CNC Fanuc G76 Threading Cycle

CNC Fanuc G76 Threading Cycle this article briefly explains all the parameters of Fanuc G76 threading cycle, like the following cnc programming code for fanuc g76 threading cycle
N5 G76 P010060 Q100 R0.05
N6 G76 X30 Z-20 P1024 Q200 F2

One Line Format for Fanuc 10/11/15T

G76 Threading Cycle One Line Format for Fanuc 10/11/15T, Fanuc control models 10/11/15 use a single-block format for G76 threading cycle.
G76 X.. Z.. I.. K.. D.. A.. F.. P..

Tapered Threading

Tapered Threading with Fanuc G76 Threading Cycle this post explained how a cnc machinist can cut Tapered Threadswith Fanuc G76 threading cycle.


Tapered Threading with Fanuc G76 Threading Cycle
The following cnc programming code is explained in the above post.
N5 G00 X50 Z5
N6 G76 P010060 Q100 R0.05
N7 G76 X43 Z-45 P1024 Q200 R-14.5 F2

Multi Start Threads

Multi Start Threads with Fanuc G76 Threading Cycle this article fully describes how to cut Multi-Start threads on cnc machine with Fanuc G76 threading cycle.

Controlling Threading Infeed Angle

Controlling Threading Infeed Angle with Fanuc G76 Threading Cycle this article explains how a cnc machinist can control Thread Infeed Angle with Fanuc G76 threading cycle.

Controlling Number of Pass and Depth of Cut

How to Fully Control G76 Threading Cycle Number of Pass and Depth of Cut Explained this articles tells how a cnc machinist can control
  • Depth of cut for First pass
  • Depth of cut for normal passes
  • Depth of cut for Last pass
  • Control number of Spring passes

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[CNC Programming Examples] Tapered Threading with Fanuc G76 Threading Cycle

Tapered Threading with Fanuc G76 Threading Cycle


Taper threading is not a usual practice in cnc machine workshops, but sometimes customer want a component with taper threading, So here is the solution. Taper threading on a cnc lathe machine with Fanuc control is just easy with Fanuc G76 threading cycle. Fanuc CNC control threading cycle G76 gives us lot of flexibility. CNC Programming tapered threading with Fanuc threading cycle G76 is not that difficult, just one parameter have to add.

Normal Threading with Fanuc G76 Threading Cycle CNC Program

N5 G76 P010060 Q100 R0.05
N6 G76 X30 Z-20 P1024 Q200 F2
One G76 parameter which have to be added for tapered threading is R in G76 second block.

Tapered Threading with Fanuc G76 Threading Cycle CNC Program


Tapered Threading with Fanuc G76 Threading Cycle
N5 G00 X50 Z5
N6 G76 P010060 Q100 R0.05
N7 G76 X43 Z-45 P1024 Q200 R-14.5 F2
Other parameter of Fanuc threading cycle G76 are explained here.
The R parameter in second block of G76 is the tapered value. Note that R is given as Radius value.

How to calculate R parameter for Tapered Threading on Fanuc with G76 Threading Cycle.

R = (Start Diameter – End Diameter) / 2

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