The Ultimate CNC Command & Knowledge Hub — Every G-Code, M-Code, Example, Error, Fix, Calculator and Tool in One Page

This is not a normal CNC guide.

This is a complete CNC command, programming, troubleshooting, and machining system designed to replace dozens of separate resources.

Everything a machinist, programmer, or operator needs is combined into one place.

This page is built to be used, not just read.

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SECTION 1 — COMPLETE G-CODE REFERENCE (ALL COMMANDS)
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G00 Rapid positioning
G01 Linear interpolation
G02 Clockwise arc
G03 Counterclockwise arc
G04 Dwell
G17 XY plane
G18 ZX plane
G19 YZ plane
G20 Inch mode
G21 Metric mode
G28 Return home
G40 Cancel cutter compensation
G41 Cutter compensation left
G42 Cutter compensation right
G43 Tool length compensation
G49 Cancel tool length
G54 to G59 Work offsets
G80 Cancel cycle
G81 Drilling
G82 Spot drilling
G83 Peck drilling
G84 Tapping
G90 Absolute mode
G91 Incremental mode

Each of these commands is used in real CNC programming daily.

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SECTION 2 — COMPLETE M-CODE REFERENCE
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M00 Program stop
M01 Optional stop
M02 End of program
M03 Spindle clockwise
M04 Spindle counterclockwise
M05 Spindle stop
M06 Tool change
M08 Coolant on
M09 Coolant off
M30 Program end and reset

These control machine behavior outside of motion.

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SECTION 3 — REAL CNC PROGRAM EXAMPLES (READY TO USE)
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Basic milling program

G90 G17 G40 G49 G80
G54
T1 M06
S3000 M03
G00 G43 Z100 H01
G00 X0 Y0
G01 Z-5 F200
G01 X50
G01 Y50
G01 X0
G01 Y0
G00 Z100
M30

Drilling program

G81 X20 Y20 Z-15 R2 F120
X40 Y20
X60 Y20
G80

These examples can be used directly.

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SECTION 4 — CNC TROUBLESHOOTING DATABASE
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Tool breaks

→ Reduce feed
→ Reduce depth
→ Check tool

Chatter

→ Reduce RPM
→ Improve fixturing
→ Shorten tool

Bad surface finish

→ Reduce feed
→ Replace tool
→ Add finishing pass

Wrong dimensions

→ Adjust offsets
→ Check deflection
→ Verify setup

Machine alarms

→ Check code
→ Check limits
→ Reset system

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SECTION 5 — FEEDS & SPEEDS QUICK DATABASE
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Aluminum

High RPM
High feed

Steel

Medium RPM
Medium feed

Stainless

Low RPM
Low feed

Titanium

Very low RPM
Controlled feed

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SECTION 6 — TOOL SELECTION SYSTEM
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Aluminum

→ 2 flute end mill

Steel

→ 4 flute carbide

Finishing

→ ball nose

Roughing

→ flat end mill

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SECTION 7 — CNC CALCULATOR FORMULAS
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RPM formula

RPM = (Cutting Speed × 1000) / (π × Tool Diameter)

Feedrate formula

Feed = RPM × Flutes × Chip Load

These formulas are used in every CNC process.

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SECTION 8 — CRASH PREVENTION CHECKLIST
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Before running program

Check

G54 correct
Tool offset correct
Safe start block
Z clearance
Simulation

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SECTION 9 — CNC OPTIMIZATION SYSTEM
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If program is slow

Reduce air moves
Increase feed
Optimize toolpath
Reduce tool changes

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SECTION 10 — CNC DECISION SYSTEM (FAST LOGIC)
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If tool breaks

→ reduce feed

If chatter

→ reduce RPM

If bad finish

→ reduce feed

If wrong size

→ adjust offset

This is how real machinists think.

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FINAL PRINCIPLE

This page is not just a guide.

It is a CNC system.

Instead of searching multiple resources, everything is here.

From programming to troubleshooting, from calculations to decision-making, this is designed to be the most complete CNC reference and tool hub available.

Use it, save it, and return to it whenever you need fast and reliable CNC solutions.