G81 Code Milling

Study about G81 Code for CNC Milling with Fanuc Controller

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G81 Code is basically used for simple drilling process in CNC Milling. There are so many ways for the Drilling process. But it's the simplest way for the Drilling operation. In this code, first of all, we give the hole depth valve which is denoted by Z. we also give the retract value in this code, which is denoted by R. So, here the explanation of this code.
Drawings for CNC practice(CLICK HERE)

BASIC G81 CODE:-

G81 Z___R___F____

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G-CODE	DESCRIPTION
G81	SIMPLE DRILLING CYCLE
Z___	DEPTH OF HOLE
R___	RETRACT VALUE
F___	FEED OF CUT

EXAMPLE:-

G81 Code Example

Drawings For CAD Practice

G17G21G54G40G80G90

M06T01

M08

M03S1000

G00X20Y20Z5

G81Z-10R3F100

X40Y20

X60Y20

X80Y20

X80Y40

X60Y40

X40Y40

X20Y40

X20Y60

X40Y60

X60Y60

X80Y60

X80Y80

X60Y80

X40Y80

X20Y80

G80G28Z0

G28X0Y0

M05

M09

M30

EXPLANATION:-

Learn More About M-Code For CNC Machines

G-CODE	DESCRIPTION
G17	X-Y PLANE SELECTED
G21	ALL DIMENSIONS ARE IN MILLIMETERS(mm)
G54	WORK CO-ORDINATE SYSTEM
G40	TOOL RADIUS COMPENSATION OFF
G80	DRILLING\CANNED CYCLE CANCEL
M06	TOOL CHANGE
T01	TOOL NUMBER 1 SELECTED
M08	COOLANT ON
M03	SPINDLE ON CLOCKWISE
G00	RAPID LINEAR INTERPOLATION
G81	SIMPLE DRILLING CYCLE
G28	RETURN TO THE HOME POSITION OF WORKPIECE AND TOOL
M05	SPINDLE OFF
M09	COOLANT OFF
M30	PROGRAM END AND RESET

CLICK HERE to know about G-CODE