Practice
How Long Does It Take to Learn G-Code? A Realistic Timeline
Recognizing the core 20 to 30 G-codes takes two to four weeks of daily practice. Reading full programs takes two to three months. Writing them takes longer.
Lawrence Arya··10 min
Guides
Belajar G-code CNC untuk pemula: panduan langkah demi langkah
Belajar G-code lebih mudah dari dugaan karena kosakatanya kecil dan tetap. Pelajari apa itu G-code, kode intinya, dan metode latihan yang benar-benar melekat.
Lawrence Arya··10 min
Guides
Cara program CNC milling Fanuc untuk pemula
Memprogram CNC milling Fanuc jadi mudah jika Anda paham struktur program dan beberapa kode inti. Berikut strukturnya, kode utamanya, dan contoh sederhananya.
Lawrence Arya··10 min
Code reference
Color Coded G-code Reference Card: A Smarter Pocket Cheat Sheet
A color coded G-code card groups codes by function so your eye finds them fast. Here is how to build the color system, what to include, and its real limit.
Lawrence Arya··10 min
Code reference
DIN 66025 G-Code Liste: Aufbau und wichtigste Befehle
DIN 66025 ist die Norm für CNC-Programme. Hier sind der Programmaufbau, die wichtigsten G-Codes und M-Befehle und wie du ein Programm sicher liest.
Lawrence Arya··10 min
Guides
Do CAM Programmers Need to Know Manual G-code?
Yes. CAM writes most of the code, but programmers still read it daily and hand-edit at the machine. Manual G-code is what separates a setter from a button pusher.
Lawrence Arya··10 min
Guides
Do I Need to Know G-code If I Use Mastercam?
You do not need to hand-write G-code to run Mastercam, but you do need to read it well enough to verify and fix what the post processor outputs.
Lawrence Arya··11 min
Guides
G-code para una ruteadora CNC china: la lista que necesitas
Las ruteadoras CNC chinas suelen usar GRBL, que entiende un conjunto reducido de G-code. Aquí tienes la lista de códigos y cómo leer el programa antes de cortar.
Lawrence Arya··10 min
Code reference
G-code Quick Reference Mouse Pad Design: What to Put On It
A G-code mouse pad keeps the common codes under your hand all day. Here is what to fit on the limited space, how to design one that lasts, and its real limit.
Lawrence Arya··10 min
Guides
How to Manually Edit Mastercam G-code Safely
You can hand-edit posted Mastercam code in Code Expert or a text editor, but the durable fix is the post or toolpath. Edit only the value, keep the block, re-verify.
Lawrence Arya··10 min
Guides
How to Program an Angle on a CNC Lathe Without CAM
Program a taper by hand with a straight G01 move to a computed X and Z endpoint. Use the tangent of the angle, and remember X is a diameter, not a radius.
Lawrence Arya··10 min
Guides
How to Read a G-code File in Notepad++
Open the .nc file in Notepad++, turn on line numbers and a monospace font, then add a User Defined Language so G, M, and coordinate words get color.
Lawrence Arya··10 min
Guides
How to Read Fusion 360 Post Processor G-code
Read Fusion 360 output in blocks: header and safety line, tool change, spindle and coolant, rapid to start, cutting moves, retract, end. The comments are your map.
Lawrence Arya··10 min
Code reference
Interactive G-code Map for Beginners: Why It Beats a Static Chart
An interactive G-code map lets beginners explore and test the codes instead of just reading a chart. Here is what makes one effective and how to learn fastest.
Lawrence Arya··10 min
Guides
Lathe Chamfer Calculation in G-code: Two Reliable Methods
Program a lathe chamfer two ways: calculate the endpoint with simple trig, or use the automatic corner chamfer. Remember X is a diameter, so double the radial leg.
Lawrence Arya··10 min
Guides
Lathe Cutting a Taper When It Should Not: Causes in Code and Setup
A CNC lathe cutting a taper on a part that should be straight is usually a code error, tool or part deflection, or tailstock misalignment. Here is how to find which.
Lawrence Arya··10 min
Code reference
Printable G-code Poster for the Shop Wall
A wall poster of the common G and M codes is a great quick reference. Here is what to put on it, how to format it to read from a few feet, and its one real limit.
Lawrence Arya··10 min
Code reference
Shapeoko Carbide Create G-code List: The Codes You Will See
The Shapeoko runs GRBL, and Carbide Create generates a compact G-code set: G0, G1, arcs, and M3 to M5 for the router. Here is the list and how to read it.
Lawrence Arya··10 min
Guides
Shop Class CNC Router Project Codes: What Students Actually Need
A shop class CNC router project needs only a short list of G and M codes. Here are the codes students use, a simple project walkthrough, and how to learn them fast.
Lawrence Arya··10 min
Guides
Snapmaker 2.0 CNC G-code Guide: Reading What Luban Outputs
The Snapmaker 2.0 runs CNC G-code generated by Luban on Marlin-based firmware. Here is how to read it, the codes it uses, and how to verify before you cut.
Lawrence Arya··10 min
Guides
Understanding SolidCAM G-code Output
SolidCAM builds the toolpath, then a post processor turns it into machine-ready G-code. Read the output in blocks and verify offsets, tools, and retracts first.
Lawrence Arya··10 min
Code reference
Visual Guide to CNC Milling: Building a Poster PDF That Teaches
A visual CNC milling poster shows the axes, planes, and key concepts, not just a code list. Here is what to include in the PDF, and the one limit to know.
Lawrence Arya··10 min
Guides
Brother Speedio Conversational to G-Code: Both Layers Mapped
Brother Speedio controls offer guided programming alongside standard G-code, and production reality uses both layers. What transfers, what stays native.
Lawrence Arya··4 min
Guides
Do I Need G-Code for a Mazak SmoothG Control? Yes, Mostly
SmoothG is the Mazak Smooth control oriented toward EIA/ISO work, so G-code is its native programming path. What that means day to day, and the exceptions.
Lawrence Arya··4 min
Guides
Do I Need to Know G-Code If I Use AI? More Than Before
AI can draft G-code, which moves you from writer to verifier, and verification demands more fluency than writing did. What changes, what does not, and why.
Lawrence Arya··4 min
Guides
Does Learning G-Code Make You a Better Machinist?
Learning G-code makes you a better machinist in four measurable ways: you catch errors before the cut, set up faster, troubleshoot alarms, and edit safely.
Lawrence Arya··4 min
Guides
Explain CNC G-Code Like I'm 5: The Simplest Real Answer
G-code is a list of tiny instructions for a robot hand that cannot see: where to go, how fast, and when to spin. The whole idea, explained from zero.
Lawrence Arya··6 min
Guides
How to Manually Verify AI-Generated G-Code: Six Passes
AI G-code fails in plausible ways, so verification needs structure: six passes from dialect check to single-block first run, each catching what the last cannot.
Lawrence Arya··5 min
Guides
What Does the G in G-Code Stand For, Actually?
Officially the G is the address for preparatory functions; informally everyone says geometric. The real story is the word-address format both answers sit in.
Lawrence Arya··5 min
Guides
Why Is My CNC Lathe Cutting Twice as Deep? The X Diameter Rule
A lathe that cuts exactly twice as deep as programmed is almost always a diameter vs radius mix-up. Here is the X rule, the four places it hides, the fix.
Lawrence Arya··6 min
Code reference
أكواد ماكينة الخراطة CNC: الجدول الأساسي والمفاهيم الأربعة
أكواد الخراطة هي النواة المشتركة زائد G18 والبرمجة بالقطر والتغذية لكل دورة وG96 مع سقف G50 ودورات G71/G70/G76. جدول مرتب وشرح للمفاهيم والأخطاء الشائعة.
Lawrence Arya··5 min
Code reference
ما الفرق بين G02 و G03 في برمجة CNC؟ اتجاه القوس ببساطة
G02 يرسم القوس مع عقارب الساعة وG03 عكسها، والحكم بالنظر عكس المحور الموجب للمستوى النشط. شرح I وJ وR مع مثال مبرمج وحيلة حفظ وفخ المخرطة.
Lawrence Arya··5 min
Guides
CIMCO Edit G-Code Simulation Basics: Backplot to Solid
CIMCO Edit simulation is two tools: a per-block backplot for motion and GPU solid simulation for stock removal and gouges. The starter workflow, limits included.
Lawrence Arya··5 min
Practice
Citizen Swiss CNC G-Code Training App: What Actually Exists
There is no official training app for Citizen Swiss CNC G-code. Here is the honest substitute: a recall app for the shared code core plus the machine-side route.
Lawrence Arya··5 min
Guides
CNC 프로그래밍 기초: 처음 배우는 사람을 위한 4단계 로드맵
CNC 프로그래밍 기초는 핵심 G코드 암기, 프로그램 소리 내어 읽기, 무료 도구로 검증, 실기 교육의 4단계로 끝납니다. 단계별 방법을 정리했습니다.
Lawrence Arya··3 min
Code reference
Datron CNC High-Speed Machining G-Code: The Honest List
The G-code core on a Datron HSM mill is the standard set every machine shares. What changes is the high-speed layer, and which codes belong to your manual.
Lawrence Arya··5 min
Guides
Do I Need to Know G-Code to Run a Tormach? Honest Answer
Not for first parts: PathPilot conversational templates write the code for you. But editing, verifying, and troubleshooting all reward G-code literacy.
Lawrence Arya··5 min
Guides
Do I Need to Know G-Code to Use an X-Carve? Now vs Eventually
To start cutting on an X-Carve: no, Easel hides it all. To troubleshoot, hit dimensions, and grow: yes, and the core takes weeks of minutes-a-day, not months.
Lawrence Arya··5 min
Guides
EIA/ISO Programming on Mazatrol SmoothX: When and How
SmoothX runs full EIA/ISO G-code alongside Mazatrol conversational, chosen per program. The decision table, the offset coverage, Quick EIA, and the M/T-code checks.
Lawrence Arya··5 min
Practice
EZCAD to G-Code for Laser Marking: Why That Is the Wrong Bridge
EZCAD drives galvo marking lasers, which do not run on G-code at all. What the search really needs: the galvo-versus-gantry split and which jobs go where.
Lawrence Arya··5 min
Code reference
Fanuc vs Mitsubishi G코드 차이점: 같은 뼈대, 다른 방언
Fanuc과 Mitsubishi 컨트롤러의 G코드는 표준 코어가 거의 같고, 차이는 고정 사이클 파라미터, 매크로 문법, 제조사 M코드 같은 바깥층에 있습니다.
Lawrence Arya··3 min
Practice
Free App para Matuto ng CNC: Ano ang Talagang Gumagana
May free app para matuto ng CNC basics: quiz-based recall ng G-codes at M-codes, short sessions, at honest na limitasyon. Heto ang gumagana at ang hindi.
Lawrence Arya··5 min
Practice
G-Code for Broaching on a CNC Lathe: Keyways the Stroke Way
Lathe broaching cuts keyways with a locked spindle and Z strokes: orient, plunge a few hundredths, stroke, step, repeat. The program shape and its guardrails.
Lawrence Arya··5 min
Practice
G-Code for Watchmaking CNC Machines: What Really Changes
Watchmaking CNC runs on the same G-code core as any shop. What changes is scale: micron tolerances, tiny tools, Swiss-type lathes and micro mills doing the work.
Lawrence Arya··5 min
Practice
G-code สำหรับผู้เริ่มต้น: เริ่มจากศูนย์ให้ถูกทาง
G-code สำหรับผู้เริ่มต้นไม่ใช่การท่องตารางยาว แต่คือแกนโค้ดราว 20 ตัวที่ฝึกด้วยควิซสั้น ๆ ทุกวัน อ่านโปรแกรมจริงทีละบรรทัด แล้วค่อยไปที่เครื่องจักร
Lawrence Arya··2 min
Code reference
G-Code Syntax vs C++: The Differences That Actually Teach
G-code and C++ differ in everything visible: words vs statements, modal state vs scope, no compiler safety net. Mapping the gap teaches both sides something.
Lawrence Arya··5 min
Guides
How to Loop a G-Code Program With M99: Three Honest Patterns
M99 loops programs three ways: at a main program's end for continuous runs, with M98 L-counts for repeats, and with macro counters for controlled cycles.
Lawrence Arya··5 min
Guides
How to Program a Part Counter in G-Code: Three Working Builds
A G-code part counter is a persistent variable incremented per cycle, plus a decision at a target: stop, message, or pause. Three builds from simple to smart.
Lawrence Arya··5 min
Practice
How to Program a Sub-Spindle Pickoff in G-Code, Step by Step
A sub-spindle pickoff hands the part from main to sub spindle mid-cycle: synchronize speeds, approach, grip, cut off, retract. The sequence and its traps.
Lawrence Arya··5 min
Practice
How to Prove You Know G-Code to an Employer, Beyond Claiming It
Employers verify G-code claims in minutes, so make verification your stage: live reading, a practice portfolio, a rigorous credential, and screening-test welcome.
Lawrence Arya··5 min
Practice
How to Read a Thread Milling G-Code Program Without Getting Lost
A thread milling program is one helix wearing G-code: an arc in XY with a Z move on the same line. Read the pitch, the radius logic, and the comp, in that order.
Lawrence Arya··5 min
Guides
How to Simulate G-Code Without a Machine: Four Free Proofs
Simulate G-code with no machine at four levels: browser viewer, desktop stock removal, LinuxCNC demo mode for control behavior, and drills for fluency.
Lawrence Arya··5 min
Practice
How to Write a G-Code Parser in JavaScript: The Sane Core
A G-code parser in JavaScript is a line splitter, a word tokenizer, and a modal-state tracker. The 40-line core, the dialect traps, and what to build on top.
Lawrence Arya··5 min
Guides
화천 CNC G코드: 표준 코어와 매뉴얼 영역을 나누는 법
화천 CNC 장비의 G코드는 대부분 범용 컨트롤러의 표준 코어입니다. 어디까지가 표준이고 어디부터가 장비 매뉴얼 영역인지 경계선을 정리했습니다.
Lawrence Arya··3 min
Practice
Is G-Code a Real Programming Language? An Honest Answer
G-code is a real domain-specific language: imperative commands, modal state, and with macro extensions, variables and control flow. What it is and is not.
Lawrence Arya··5 min
Practice
Is G-Code Case Sensitive? The Short Answer and the Long Habit
Most controls treat g01 and G01 identically: G-code is broadly case-insensitive for words. The exceptions, the uppercase convention, and where case bites.
Lawrence Arya··4 min
Practice
Is G-Code Turing Complete? A Machinist-Friendly CS Answer
Base G-code is not Turing complete: no branching, no unbounded state. Add the macro layer (variables, IF, WHILE) and the answer flips, with honest asterisks.
Lawrence Arya··4 min
Practice
Kern Micro Milling CNC Programming Basics: Where to Start
Programming a Kern-class micro mill starts from the standard G-code core, then adds micron discipline: compensation, thermal stability, probing, tiny-tool feeds.
Lawrence Arya··5 min
Practice
คู่มือ G-code เครื่องกัด CNC: หนึ่งหน้าที่ใช้งานได้จริง
คู่มือ G-code เครื่องกัดที่ดีไม่ใช่เล่มหนา แต่คือหน้าเดียวที่มีโค้ดใช้ประจำ จุดเน้นเรื่อง G43 ชดเชยความยาวเครื่องมือ และที่ว่างให้จดโค้ดเฉพาะเครื่อง
Lawrence Arya··2 min
Practice
ความแตกต่าง G02 G03 ใน CNC: ทิศของส่วนโค้งที่ไม่สับสนอีก
G02 เดินส่วนโค้งตามเข็มนาฬิกา G03 ทวนเข็ม โดยมองสวนแกนบวกของระนาบที่ใช้งาน บทความนี้มีกฎ ตัวอย่างโปรแกรม เทคนิคจำ และจุดที่เครื่องกลึงหลอกตา
Lawrence Arya··2 min
Practice
KUKA KRL to Standard G-Code Conversion: The Real Answer
There is no clean converter between KUKA KRL and G-code, and you rarely need one: both are outputs of CAM. What actually transfers is the motion-concept layer.
Lawrence Arya··5 min
Guides
Mill-Turn Y-Axis G-Code Basics: Off-Center Without the Modes
A real Y axis on a mill-turn machine moves the live tool off the spindle centerline: ordinary XYZ-style blocks replace interpolation modes for keyed flats and off-center features.
Lawrence Arya··5 min
Guides
Mitsubishi M70 G-Code Programming Basics That Actually Stick
The Mitsubishi M70 control runs the familiar standard core with its own cycle and parameter flavor. The basics that transfer, and the edges its manuals own.
Lawrence Arya··4 min
Guides
NCプログラム練習アプリの選び方：本当に身につく条件
NCプログラムの練習アプリは「思い出させて、すぐ採点し、間違いを繰り返す」ものだけが効果的です。選び方の基準と1週間の使い方をまとめました。
Lawrence Arya··1 min
Code reference
PathPilot G-Code Supported List: Every Family, Mapped
Tormach publishes the full PathPilot G-code list free. Here it is mapped by family, with the lathe G7 rule, the LinuxCNC-shaped dialect, and Fanuc checkpoints.
Lawrence Arya··5 min
Practice
Regex for Cleaning G-Code Files: Patterns That Pay Their Rent
G-code's line-based format is regex-friendly: strip comments, normalize case and spacing, hunt unsafe blocks. The patterns, plus the verify-after rule.
Lawrence Arya··5 min
Practice
เรียน CNC Fanuc ด้วยตัวเอง: ทำได้แค่ไหนและทำอย่างไร
เรียน CNC Fanuc ด้วยตัวเองได้ครึ่งทางคือชั้นความรู้ทั้งหมด โค้ดแกน นิสัยของ Fanuc อย่าง M98/M99 และกับดักระบบโค้ด A ส่วนหน้าจอจริงต้องพึ่งเครื่องและครู
Lawrence Arya··1 min
Practice
Roland MDX Jewelry CNC and G-Code: What You Actually Write
Roland MDX desktop mills carve jewelry wax, but their native language is RML-1, not standard G-code. Here is what transfers, what does not, and what to learn.
Lawrence Arya··5 min
Practice
SkillsUSA CNC Technician: The G-Code Side of Getting Ready
What the G-code half of SkillsUSA CNC technician readiness looks like: the core every contest assumes, the reading drills that score, and where the rules live.
Lawrence Arya··5 min
Practice
Stone Cutting CNC G-Code Commands: The Honest Rundown
Stone cutting CNC machines read the standard G-code core. What stone changes is the discipline: diamond tooling, water never off, slow feeds, and machine-layer codes.
Lawrence Arya··5 min
Practice
Swiss Lathe Superimposed Machining: How the G-Code Thinks
Superimposed machining runs two operations on one part at the same time. Here is how Swiss lathe programs coordinate it: channels, wait codes, and planning.
Lawrence Arya··5 min
Guides
Syntec CNC Controller G-Code Manual: How to Actually Find It
Syntec controllers run routers and mills worldwide on a familiar standard core. Where the real manuals live, what transfers without one, and the model-match rule.
Lawrence Arya··5 min
Code reference
تعلم أكواد G-code بالعربي: النواة الأساسية وطريقة الحفظ
الأكواد رموز عالمية تبقى لاتينية، والتعلم بالعربي يعني ربط كل رمز بمعناه. جدول النواة الأساسية مع ملاحظات الحفظ بالأزواج وخطة تثبيت يومية قصيرة.
Lawrence Arya··4 min
Practice
Why Does G-Code Use Line Numbers (N Codes)? History and Today
N numbers are labels, not commands: born in the punched-tape era for block identification, surviving today for restarts, jumps, alarms, and shop communication.
Lawrence Arya··4 min
Practice
CNC Basics for an Apprentice Mechanical Fitter
Moving from fitting into CNC? You already have the measurement and drawing skills. The new part is G-code. Here are the basics a mechanical fitter needs first.
Lawrence Arya··4 min
Practice
Apprenticeship Readiness Program G-Code Basics
An apprenticeship readiness program should teach a small G-code core: the starter codes, program structure, and offsets, drilled to recall before day one.
Lawrence Arya··4 min
Practice
Is There an Audiobook for Learning CNC G-Code?
Audio teaches CNC concepts well and symbol tables badly. Here is what listening can and cannot do for G-code, and the commute strategy that actually works.
Lawrence Arya··4 min
Practice
Best App to Learn CNC Router Programming
CNC routers run on G-code, even when CAM writes it for you. The best app to learn router programming is one that teaches the codes so you can verify and debug.
Lawrence Arya··5 min
Practice
The Best Fonts for Reading G-Code Without Errors
The best G-code fonts are monospaced with a slashed or dotted zero, distinct 1, l, and I, and a visible decimal point. Here is the checklist and why it matters.
Lawrence Arya··4 min
Practice
Centroid Acorn G-Code Practice for Beginners
The Centroid Acorn runs standard G and M codes, so learning the common codes is the fastest way to get comfortable. Here is what to practice and how.
Lawrence Arya··4 min
Code reference
CNC Cheat Sheet Badge Buddy: What to Put on the Card
A badge buddy holds about twenty codes legibly. Here is the exact front and back worth printing, the sizing specs, and when to retire the card on purpose.
Lawrence Arya··5 min
Code reference
Additive vs Subtractive G-Code: The Real Differences
Printers and mills share the same motion core; the dialects split at the tool: extrusion and heat words on one side, spindle, offsets, and cycles on the other.
Lawrence Arya··4 min
Guides
Do You Have to Type Leading Zeros in G00? (G0 vs G00)
No. G0 and G00 are the same, and leading zeros are optional everywhere. The thing that actually matters is the decimal point, not the leading zero. Here is why.
Lawrence Arya··4 min
Practice
Does Learning G-Code Increase Machinist Salary?
G-code skill alone does not raise pay; the roles it unlocks do. Operators who read and edit programs move up to setup and programming work, which pays more.
Lawrence Arya··4 min
Practice
Dyslexia and CNC Programming: What Actually Helps
CNC code is short, structured tokens rather than dense prose, which suits many dyslexic learners. Here are the real friction points and the fixes that work.
Lawrence Arya··4 min
Guides
Fanuc Alarm 010 Improper G-Code: Causes and Fixes
Fanuc alarm 010 means an improper G-code: a code that does not exist or is not enabled on your machine was commanded. Here are the common causes and how to find it.
Lawrence Arya··4 min
Practice
G-Code Basics in 10 Minutes: A Free Beginner Guide
Learn the G-code essentials fast: what a program is, the dozen codes that cover most of it, and a tiny example. Then practice them so they actually stick.
Lawrence Arya··4 min
Practice
G-Code for Automatic Tool Changers on Wood Routers
On an ATC router the file just says T2 M6; a macro does the choreography. Here is the sequence, the rack vs carousel difference, and the per-tool Z that matters.
Lawrence Arya··4 min
Practice
G-Code Mnemonics and Memory Tricks That Stick
A working collection of G-code memory hooks: zero-cutting G00, the off-follows-on M-code families, Z follows the spindle, and the -30- end mark behind M30.
Lawrence Arya··4 min
Guides
A G-Code Test to Prove You Can Set Up a CNC Machine
Setup competence is provable with a short test: explain the safety block, set offsets correctly, and prove out a program. Here is the checklist shops trust.
Lawrence Arya··4 min
Code reference
G-Code Variables: #100 vs #500 Series Differences
Macro variables differ by lifespan: #100-series commons clear at power-off, #500-series survive it, and locals #1-#33 live only inside a call. Here is the map.
Lawrence Arya··4 min
Code reference
G-Code vs M-Code: What Is the Difference?
G-codes control how the machine moves and M-codes control machine actions like the spindle and coolant. Here is the real difference and how they work together.
Lawrence Arya··4 min
Code reference
G17, G18, G19: Plane Selection in G-Code Explained
G17 selects the XY plane, G18 the XZ plane, and G19 the YZ plane. Here is what plane selection controls, why arcs depend on it, and when to switch.
Lawrence Arya··4 min
Code reference
G20 vs G21: Inch vs Metric in G-Code, Explained
G20 tells the control to read the program in inches and G21 in millimeters. Here is the difference, why the wrong one is dangerous, and how to keep them straight.
Lawrence Arya··4 min
Code reference
G28 Return to Home Position in G-Code, Explained
G28 sends the machine back to its reference (home) position, through an intermediate point you specify. Here is how it works and how to use it safely.
Lawrence Arya··4 min
Code reference
G41 vs G42: Cutter Compensation Left vs Right
G41 offsets the cutter to the left of the path and G42 to the right. Here is how cutter compensation works, the D register, and how to engage it without a crash.
Lawrence Arya··4 min
Code reference
G43 Tool Length Offset in G-Code, Explained
G43 applies a tool's stored length so its tip reaches the programmed Z, no matter how long the tool is. Here is how G43, the H register, and G49 work.
Lawrence Arya··5 min
Code reference
G54 Work Offsets Explained for CNC Beginners
G54 tells the machine where your part zero is. Here is what a work offset stores, how G54 to G59 differ, and how to set one without cutting in the wrong place.
Lawrence Arya··4 min
Code reference
G81 vs G83: Drilling Canned Cycles Explained
G81 is a simple drill cycle and G83 is a peck drill cycle for deep holes. Here is how canned cycles work, their R, Z, and Q words, and when to use each.
Lawrence Arya··5 min
Guides
How to Read a CNC Program for Beginners
A CNC program is read one block at a time, top to bottom. Here is how to decode each line of a real program, the letters that matter, and how to get fluent.
Lawrence Arya··5 min
Practice
How to Stop Skipping Lines When Reading G-Code
Line-skipping happens because programs look visually uniform and eyes lose anchor. Physical tracking, narration, and instant code recall end it reliably.
Lawrence Arya··4 min
Practice
Conversational or G-Code First? What to Learn When
Learn G-code first in most cases: it transfers everywhere and makes every conversational system easier. Learn conversational first only for this week's machine.
Lawrence Arya··4 min
Guides
Why a Boring Bar Crashes Into the Back of the Part
A boring bar hits the back of the part when the Z depth runs too far: wrong depth, wrong Z zero, an absolute mix-up, or a bad retract. Here are the causes and fixes.
Lawrence Arya··5 min
Code reference
Lathe vs Mill G-Code Differences: A Cheat Sheet
The motion core is identical; six differences do the damage: default plane, diameter programming, feed modes, CSS, cycle families, and comp mechanics.
Lawrence Arya··4 min
Code reference
Mazatrol vs G-Code: The Differences That Matter
Mazatrol is Mazak's menu-guided programming language; G-code is the universal word-address standard. Here is how they differ and when each one wins.
Lawrence Arya··4 min
Guides
Missing Decimal Point in G-Code: Why It Crashes
A missing decimal point can make a G-code move 1000 times too big or too small, depending on the control's setting. Here is why it happens and how to avoid it.
Lawrence Arya··4 min
Practice
SheetCam Post Processor G-Code Edits That Make Sense
SheetCam's post processors are editable scripts that decide every emitted line. Here is when to edit the post versus the output, and the safe workflow for both.
Lawrence Arya··4 min
Code reference
Siemens ShopMill vs ISO G-Code: Which to Use When
ShopMill programs Sinumerik machines through graphical work steps; ISO G-code programs them through classic blocks. Here is how they differ and when each wins.
Lawrence Arya··4 min
Practice
Speed Reading G-Code: Exercises That Actually Work
G-code reading speed is built in a ladder: token sprints, timed narration, state quizzes, and flaw hunts. Six exercises, with accuracy always bought first.
Lawrence Arya··4 min
Practice
From Manual Machining to CNC G-Code: The Transition
Manual machinists own the deepest transferable skills in the shop. The CNC move is formalizing handle-feel into code: offsets, F words, and trust in the program.
Lawrence Arya··4 min
Code reference
Waterjet CNC G-Code Differences: What Changes and Why
Waterjet code keeps the 2D motion core and swaps everything tool-shaped: pump M-codes instead of a spindle, pierce dwells, and kerf comp doing the sizing work.
Lawrence Arya··4 min
Guides
Why Did ChatGPT G-Code Crash My CNC? What to Check
AI-written G-code crashes because the model does not know your machine, offsets, tools, or fixtures, and it can invent codes that look right. Here is what to check.
Lawrence Arya··4 min
Practice
Why Do Machinists Still Write G-Code Manually?
CAM generates most production code, yet machinists still type G-code daily: MDI moves, edits at the machine, simple parts, macros, and fixing what CAM got wrong.
Lawrence Arya··4 min
Guides
Why Does My Conversational Program Throw a G-Code Alarm?
Conversational programming still generates G-code underneath, so it can still alarm: bad inputs, undefined tools or offsets, or a missing software option.
Lawrence Arya··4 min
Practice
CNC Practice Resources for Women in Manufacturing
Free, low-barrier CNC practice resources help more women enter machining. Here are the types that work, from recall apps to study guides, and how to use them.
Lawrence Arya··4 min
Guides
Bar Puller G-Code on a Lathe: How the Program Works
A bar puller pulls fresh stock out of the collet for the next part. Here is the logic of the G-code behind it, explained conceptually for learners.
Lawrence Arya··5 min
Practice
A CNC Machining Tycoon Game With Real G-Code: Reality Check
A tycoon game that teaches real G-code is a fun idea, but management games rarely build real skill. Here is what actually does, without losing the fun.
Lawrence Arya··5 min
Practice
CNC Turning Center G-Code: How Lathe Codes Differ
Turning shares the common codes with milling but adds lathe-specific ones: constant surface speed, diameter mode, and turning cycles. Here is what to practice.
Lawrence Arya··5 min
Practice
Do I Need to Memorize G-Code for the NIMS Test?
You do not need to memorize the whole G-code standard for a NIMS test, but you do need fast recall of the common codes. Here is the line between the two.
Lawrence Arya··5 min
Practice
Is There a Duolingo for CNC Programming?
The Duolingo idea, short daily lessons, streaks, and spaced review, maps almost perfectly onto learning G-code. Here is why, and what to look for in a tool.
Lawrence Arya··5 min
Guides
G-Code for Mechanical Engineers: A Crash Course
Engineers do not need to hand-write programs, but reading G-code helps you verify CAM output and talk to machinists. Here is the focused crash course.
Lawrence Arya··5 min
Code reference
Thread Milling vs Tapping: The G-Code Difference
Tapping uses a canned cycle like G84; thread milling uses helical interpolation with G02 or G03 plus Z. Here is how the two approaches differ in code.
Lawrence Arya··5 min
Practice
G-Code Test for a Job Interview: What to Study and How
What a G-code test in a CNC job interview usually covers, the codes to know cold, and a fast way to drill them before you walk in.
Lawrence Arya··5 min
Practice
Haas Certification G-Code: How to Study (Not Cheat) for It
Searching for Haas certification answers is the wrong move. Here is what the Haas G-code knowledge involves and how to actually study it.
Lawrence Arya··5 min
Practice
Haas CNC Competition Part: How to Practice the G-Code
A Haas competition part rewards reading and writing standard G-code fast and machining it accurately. Here is how to practice, on Haas-style conventions.
Lawrence Arya··5 min
Guides
How to Safely Test a G-Code Program: Beginner Concepts
The checks beginners learn before running a new program: dry run, single block, rapid override, and a graphics preview, explained at a concept level.
Lawrence Arya··5 min
Practice
Journeyman Machinist G-Code Test Questions: What to Expect
A journeyman-level G-code test goes beyond the basics into offsets, compensation, canned cycles, and reading a full program. Here is the deeper scope to study.
Lawrence Arya··5 min
Practice
GRBL Laser G-Code: Practice Exercises for Beginners
GRBL laser G-code is a small, friendly subset: G0/G1 for moves, M3/M4/M5 for the laser, and S for power. Here are simple exercises to learn it by doing.
Lawrence Arya··5 min
Guides
Mesa Card + LinuxCNC: The G-Code Is Still Standard
A Mesa card is hardware that connects LinuxCNC to your machine. It changes the wiring and config, not the G-code. Here is what to practice for the program side.
Lawrence Arya··5 min
Practice
The Most Basic G-Code Program Example, Explained Line by Line
A complete but minimal G-code program, explained one line at a time, so you can see how the common codes fit together. A teaching example, not a runnable file.
Lawrence Arya··5 min
Practice
What G-Code Is on the NIMS CNC Mill Test? The Likely Scope
The G-code a NIMS CNC milling credential expects is the standard mill set: motion, plane and units, offsets, compensation, and basic canned cycles. Here is the list to study.
Lawrence Arya··5 min
Practice
Will a Machine Shop Test My G-Code Knowledge?
Many shops do test your code knowledge when hiring, through a short quiz, a program to read, or questions at the machine. Here is what to expect and how to be ready.
Lawrence Arya··5 min
Guides
The Z-Axis Plunge Crash: The G-Code Mistake Behind It
A Z-axis plunge crash usually comes from a rapid into the part, a wrong tool length offset, or a missing retract. Here are the code mistakes behind it, for learners.
Lawrence Arya··5 min
Practice
Beginner CNC Code Practice: How to Actually Memorize G-Code
A practice-first plan for memorizing the G-code and M-code a CNC beginner needs, built around short daily recall instead of long manuals.
Lawrence Arya··5 min
Code reference
G00 vs G01: Rapid vs Linear Feed, Explained for Beginners
G00 is a rapid positioning move and G01 is a controlled linear feed move. Here is the difference, why beginners mix them up, and how to keep them straight.
Lawrence Arya··5 min
Code reference
G02 vs G03: Clockwise vs Counterclockwise Arcs Explained
G02 cuts a clockwise arc and G03 cuts a counterclockwise arc. Here is how to tell them apart, which way to look, and why beginners reverse them.
Lawrence Arya··5 min
Code reference
Common G-Codes Every CNC Beginner Should Know
A short reference list of the G-codes that show up in almost every CNC program, with a one-line meaning for each, built for beginners.
Lawrence Arya··5 min
Practice
How to Memorize G-Code Faster: A Practice-First Method
Five techniques that make CNC G-code stick: retrieval practice, two-way recall, spacing, drilling mix-ups, and reviewing only your weak codes.
Lawrence Arya··5 min
Code reference
Modal vs Non-Modal G-Codes: What Beginners Get Wrong
Modal G-codes stay active until you change them; non-modal codes act only on their own line. Here is why that distinction trips up beginners.
Lawrence Arya··5 min