Common "G" Codes for CNC Turning:-

Common "G" Codes for CNC milling:-

• 
  G00 Rapid positioning (point to point)
  
• 
  G01 Linear interpolation
  
• 
  G02 Circular/helical interpolation CW
  
• 
  G03 Circular/helical interpolation CCW
  
• 
  G04 Dwell
  
• 
  G06 Spline interpolation
  
• 
  G07 Hypothetical axis interpolation
  
• 
  G09 Exact Stop
  
• 
  G11 Mirror image cancel
  
• 
  G12 Mirror X Axis values
  
• 
  G13 Mirror Y Axis values
  
• 
  G14 Mirror XY Axis values
  
• 
  G17 X-Y plane select
  
• 
  G18 Z-X plane select
  
• 
  G19 Y-Z plane select
  
• 
  G20 Inch input (equivalent to G70)
  
• 
  G21 Metric input (equivalent to G71 )
  
• 
  G28 Return to machine coordinate origin
  
• 
  G29 Return from machine coordinate origin
  
• 
  G40 Cutter radius compensation cancel
  
• 
  G41 Cutter radius compensation left
  
• 
  G42 Cutter radius compensation right
  
• 
  G43 Tool length compensation +
  
• 
  G44 Tool length compensation -
  
• 
  G49 Tool length compensation cancel
  
• 
  G50 Scaling cancel
  
• 
  G51 Scaling
  
• 
  G53 Machine coordinate system selected
  
• 
  G54 Work coordinate frame 1 selection
  
• 
  G55 Work coordinate frame 2 selection
  
• 
  G56 Work coordinate frame 3 selection
  
• 
  G57 Work coordinate frame 4 selection
  
• 
  G58 Work coordinate frame 5 selection
  
• 
  G59 Work coordinate frame 6 selection
  
• 
  G61 Exact stop mode (block by block)
  
• 
  G64 Continuous mode (look-ahead)
  
• 
  G70 Inch input
  
• 
  G71 Metric Input
  
• 
  G73 Peck drilling cycle
  
• 
  G74 Counter tapping cycle
  
• 
  G76 Fine boring cycle
  
• 
  G80 Canned cycle cancel
  
• 
  G81 Drilling cycle, spot boring
  
• 
  G82 Drilling cycle, counter boring
  
• 
  G83 Peck drilling cycle
  
• 
  G84 Tapping cycle
  
• 
  G85 Boring cycle
  
• 
  G86 Boring cycle
  
• 
  G87 Back boring cycle
  
• 
  G88 Boring cycle
  
• 
  G89 Boring cycle
  
• 
  G90 Absolute command
  
• 
  G91 Incremental command
  
• 
  G92 Work coordinates change
  
• 
  G93 Inverse time feed
  
• 
  G94 Feed rate per minute
  
• 
  G95 Feed rate per revolution
  
• 
  G98 Canned cycle initial level return
  
• 
  G99 Canned cycle R point level return
  

NC part programming consists of planning and documenting the sequence of processing steps to be performed on an Nc machine . The documentation portion of part programming involves the input medium used to transmit the program of instructions to the NC machine control unit.

Part programming can be accomplished using a variety of procedures ranging from highly manual to highly automated methods . These methods are:

1. 
   Manual Part Programming
   

Manuscripts are typed with a device known as flexo writer, which is also used to type

the program instructions. After the program is typed, the punched tape is prepared on th

flexo writer. Complex shaped components require tedious calculations. This type of

programming is carried out for simple machining parts produced on point-to-point

machine tool.

To be able to create a part program manually, need the following information :

(a) Knowledge about various manufacturing processes and machines.

(b) Sequence of operations to be performed for a given component.

(c) Knowledge of the selection of cutting parameters.

(d) Editing the part program according to the design changes.

(e) Knowledge about the codes and functions used in part programs

If the complex-shaped component requires calculations to produce the component are

done by the programming software contained in the computer. The programmer

communicates with this system through the system language, which is based on words.

There are various programming languages developed in the recent past, such as APT

(Automatically Programmed Tools), ADAPT, AUTOSPOT, COMPAT-II, 2CL,

ROMANCE, SPLIT is used for writing a computer programme, which has English like

statements. A translator known as compiler program is used to translate it in a form

acceptable to MCU.

The programmer has to do only following things :

(a) Define the work part geometry.

(b) Defining the repetition work.

(c) Specifying the operation sequence.

Over the past years, lot of effort is devoted to automate the part programme generation.

With the development of the CAD (Computer Aided Design)/CAM (Computer Aided

Manufacturing) system, interactive graphic system is integrated with the NC part

programming. Graphic based software using menu driven technique improves the user

friendliness. The part programmer can create the geometrical model in the CAM package

or directly extract the geometrical model from the CAD/CAM database. Built in tool

motion commands can assist the part programmer to calculate the tool paths

automatically. The programmer can verify the tool paths through the graphic display

using the animation function of the CAM system. It greatly enhances the speed and

SINUMERIK 810

Survey on M Commands

M00 .......Programmed stop unconditional

M01 .......Programmed stop conditional

M02 .......Main program end

M03 .......Spindle ON clockwise

M04 .......Spindle ON counterclockwise

M05 ............ Spindle OFF

M08 .......Coolant ON

M09 ............. Coolant OFF

M17 .......Subroutine end

M20 .......Tailstock BACK

M21 .......Tailstock FORWARD

M25 .......Open clamping device

M26 .......Close clamping device

M30 .......Main program end

M52 ....... C- axis ON

M53 ........C- axis OFF

M71 ....... Puff blowing ON

M72 .............. Puff blowing OFF