1. G-Code 101 With the Mike Mattera
Autodesk HSM – Weekly Technical Webinar
G-Code 101
With the Mike Mattera
Mike Mattera
Content Experience Developer

2. HSM Weekly Webinar Origins of NC Programming Alpha Numeric Codes
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
Origins of NC Programming
Alpha Numeric Codes
Basic Motion Codes
“Canned” Motion Codes
Modal Conditions & Code Groups
Arc/Circular Move Formats
What is a Postprocessor
Basic Requirements For Writing Postprocessors

3. HSM Weekly Webinar Origins of NC/CNC Programming
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
Origins of NC/CNC Programming
Early 1950’s Using Punched Cards & Paper Tape
Faster/Better Jet Engines & Airframe Components
Air Force Standardized Code Formats In 1956
The First Programming System (APT) in 1957

4. HSM Weekly Webinar G Code Programming – Why Alpha Numeric Codes?
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
G Code Programming – Why Alpha Numeric Codes?
N#### G## X## Y## Z## F## S#### T## M##
A simple way to define motion/function
Declare a position
Set a value
Select an item
Switch something on/off

5. HSM Weekly Webinar G Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
G Code & Machine Motion
There are 3 basic motion types
Linear move to an XYZ position as fast as possible
Linear move to an XYZ position at a defined feedrate
Circular move to a position at a defined federate

6. HSM Weekly Webinar G Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
G Code & Machine Motion
Linear Rapid – G00 (G zero zero, not the letter O)
Linear Feed – G01
Since there are two directions for a circle
Circular CW – G02
Circular CCW – G03

7. HSM Weekly Webinar Typical CNC Machine Codes
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
Typical CNC Machine Codes
N#### G## X## Y## Z## F## S#### T## M##
Generally defines motion – G##
Declare a position - X## Y## Z##
Set a value – F## - Feedrate or S### - Spindle Speed
Select an item – T## - Tool Selection
Switch something on/off - M## - Miscellaneous Functions

8. HSM Weekly Webinar Typical CNC Machine Codes
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
Typical CNC Machine Codes
N#### G## X## Y## Z## F## S#### T## M##
Generally defines motion – G##
Declare a position - X## Y## Z##
Set a value – F## - Feedrate or S### - Spindle Speed
Select an item – T## - Tool Selection
Switch something on/off - M## - Miscellaneous Functions
G01 X1. Y1. F20. T01 M03 S500

9. HSM Weekly Webinar Miscellaneous Codes – M Functions
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
Miscellaneous Codes – M Functions
M00     Program stop
M01     Optional program stop M02     End of program M03     Spindle on clockwise M04     Spindle on counterclockwise M05     Spindle stop M06     Tool change M08     Flood Coolant on M09     Coolant off M30     End of program / Return to start
M Spindle Low Gear Range
M Spindle Hi Gear Range

10. HSM Weekly Webinar
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
Modality – If it’s on, It stays on till you turn it off
Only 1 function can be active at any given time
Select a new function to deactivate the previous function
Linear Rapid – G00
Linear Feed – G01
Circular CW – G02
Circular CCW – G03

11. HSM Weekly Webinar
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
Modality – If it’s on, It stays on till you turn it off
Only 1 function can be active at any given time
Select a new function to deactivate the previous function
Linear Rapid – G00
Linear Feed – G01
Circular CW – G02
Circular CCW – G03
G00 X1 Y1
X2 Y2
G01 X3 Y3 X2 Y2

12. HSM Weekly Webinar Canned Cycles - Drilling (G80 thru G89)
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
Canned Cycles - Drilling (G80 thru G89)
Incorporates all the motion of a common task
Basic Drill Peck Drill Counter Bore Tapping
G G G G84

13. HSM Weekly Webinar Canned Cycles - Drilling (G80 thru G89)
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
Canned Cycles - Drilling (G80 thru G89)
Drilling is Modal
Once activated, only the hole locations need to be specified
G81 X1.5 Y R.1 Z-.25 F12.0
X3.5 Y-2.5
X2.5
G80

14. HSM Weekly Webinar Code Groups
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
Code Groups
Allows you to have multiple codes on a single line
But only 1 code from each group per line
The modal groups for G-codes are:
Group 1 = {G00, G01, G02, G03, G80, G81, G82, G84, G85, G86, G87, G88, G89} Motion
Group 2 = {G17, G18, G19} Plane Selection (XY, YZ, ZX)
Group 3 = {G90, G91} Absolute / Incremental mode
Group 5 = {G93, G94} Feed Rate Mode
Group 6 = {G20, G21} Units (Inches / Millimeters)
Group 7 = {G40, G41, G42} Cutter Radius Compensation (CRC)
Group 8 = {G43, G49} Tool Length Offset (TLO)
Group 10 = {G98, G99} Return Mode in Canned Cycles
Group 12 = {G54. G55, G56, G57, G58, G59, G59.xxx} Work Coordinate System Selection (WCS)

15. HSM Weekly Webinar All CNC Code Is Not “G Code”
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
All CNC Code Is Not “G Code”
All machines require the same information
Not all information looks the same
That’s why we have 1000 Postprocessor in the library

16. HSM Weekly Webinar Creating an Arc/Circular move
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
Creating an Arc/Circular move
Arc Start Point (Green Dot)
Arc Cutting Direction – CW/CCW (Blue Arrows)
Arc End Point (Red Dot)
Arc Center Point or Radius Size (Black Cross/Arrows)

17. HSM Weekly Webinar Creating an Arc/Circular move
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
Creating an Arc/Circular move
Fanuc/Haas
G2 X4.5 Y I0.0 J F7.5
Fanuc/Haas
G2 X4.5 Y R F7.5
Anilam 1100/3300
Arc Cw X Y XCenter YCenter Feed 7.5
Arc Cw X Y Radius Feed 7.5 or
Heidenhain
CC X3.0 Y-1.0
CW X4.5 Y-1.0 F7.5
Heidenhain
CC X3.0 Y-1.0
CP PA90 DR- F7.5
Heidenhain
CR X3.0 Y-1.0 DR- R1. F7.5

18. HSM Weekly Webinar Postprocessors A Postprocessor is a translator.
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
Postprocessors
A Postprocessor is a translator.
It translates the image of the toolpath on your screen into the language for a specific machine/control.
O0001
N10 G20 G90 G94 G17
N10 G40 G80
N12 G28 G91 Z0 H0
N14 G28 X0 Y0
N18 T01 M06 (1.0 End Mill)
N24 S1200 M3
N26 G0 X-0.75 Y0.5
N28 G43 H01 Z0.1 H01 M9
N30 Z0.1
N32 X-0.625
N34 G94 G1 Z-1.0 F20.0
N36 X F6.0
N38 X3.0
N40 G2 X4.5 Y-1.0 I0.0 J-1.5 F7.5
N42 G1 Y-3.5 F6.0
N44 X4.0
N46 G3 X3.5 Y-4.0 I0.0 J-0.5 F4.5
N48 G1 Y-4.5 F6.0
N50 X0.75
N52 G2 X-0.5 Y-3.25 I0.0 J1.25 F7.5
N54 G1 Y0.125 F6.0
N58 G0 Z0.1
N60 G1 Y0.75 Z-1.0 F20.0
N62 M30 %

19. HSM Weekly Webinar Creating a Postprocessor – Requirements
G - Code & Machine Motion
Mike Mattera - Content Experience Developer (CXD) - CAM
Creating a Postprocessor – Requirements
Machine mfg. Name & Model, Control Name & Model
Type, # of Axis, Axis designations (Vertical Mill, 4 Axis, X,Y,Z,A)
List of the G-Codes / M-Codes for the machine
Sample Program using the Post Test Part (available to all customers)
The sample program should have been successfully run in the machine with no errors

20. Thank You HSM Weekly Webinar – G Code Programming Mike Mattera
Content Experience Developer (CXD) – CAM -