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G-Code Academy
Browser-based CNC training for lathe, mill, GD&T, and every major controller. Theory, real code, live calculators, and milestone badges — built so anyone can become floor-ready.
Free Beginner tracks · Pro unlocks Intermediate → Automation, GD&T, and certification tests
CNC training is locked behind shops, schools, and paywalls.
Aspiring machinists wait for an apprenticeship slot. Operators stall because no one has time to teach them advanced cycles. Programmers want to mentor but lack a shared reference. Meanwhile the industry screams for talent.
GCA is free, browser-based, and open to anyone with the will to learn.
Four tracks. One academy.
Pick your machine. Pick your control. Build the skill.
CNC Lathe
Turning, threading, boring, live tooling, sub-spindle.
CNC Mill
Milling, drilling, boring, 4/5-axis indexing & simultaneous.
GD&T
Symbols, datums, tolerance stacks, drawing interpretation.
Controls
Fanuc, Haas, Siemens, Heidenhain — controller-specific syntax.
Pick your trade. Start in seconds.
8 preset profession tracks across CNC machining, cabinetry, automotive, welding, construction, electrical, plumbing, and HVAC — each with matched OAP sections, GCA tests, and inspection-tool videos. No empty dashboards, no setup required.
CNC Machining
Mill, lathe, mill-turn, Swiss, EDM — the full precision-machining stack.
What you'll cover
- Fanuc, Haas, Mazak, Okuma, Siemens controller-specific G-code
- Speeds & feeds, surface footage, and coolant strategy
- Mentor-graded inspection-tool proficiency tests
- GD&T datums, tolerance stacks, and print interpretation
OAP study plan0 sections
No mapped sections yet — universal 12 still apply.
GCA practice tests0
No banks matched — open the full library.
Operator to engineer — in one path.
Each level builds on the last. No assumptions, no skipping.
Beginner
Floor-ready CNC operatorSafety, machine anatomy, basic G/M codes, work offsets, tool changes, MDI fundamentals.
Intermediate
Setup technician — MDI & hand programmingHand-written programs, canned cycles, G96/G97, threading cycles, drilling cycles, work-holding.
Advanced
Full CNC programmerMacro programming, parametric programs, probing routines, sub-programs, multi-tool strategies.
Automation
Senior programmer / manufacturing engineerLights-out, pallet pools, robot integration, post processing, full-shop production strategy.
Built like a workshop, not a textbook.
Theory + Code + Quiz
Every lesson has explanation, real G-code samples, live calculators, and a graded quiz.
Live Calculators
G96/G97 SFM ↔ RPM, G50 max-RPM advisor, feed-per-tooth, IPM, and speeds-and-feeds.
Stepped Progression
Beginner → Intermediate → Advanced → Automation. No skipping. Operator-first design.
Interview Prep
Timed test bank: controller-specific, machine-type, and GD&T questions with scoring.
Milestone Badges
Earn portable badges: Operator Ready, Setup Tech, CNC Programmer, Lathe/Mill Certified.
Free Forever Tier
Anyone can learn. Pro unlocks the full curriculum, all controllers, and certification tests.
Built for everyone on the shop floor.
Manufacturers
Train operators without burning supervisor hours.
- Standardized curriculum — every operator learns the same fundamentals
- Controller-specific tracks for Fanuc, Haas, Siemens, Heidenhain
- Reduce scrap by qualifying operators before they touch live work
- Track team progress through milestone badges
- Pairs directly with the OAP for on-machine sign-off
Operators & Apprentices
Learn at your pace — own your progress.
- Free standalone mode — no employer required
- Lathe and mill tracks with hands-on G-code examples
- Live calculators replace the dog-eared cheat sheet
- Milestone badges you keep across jobs
- Interview-prep mode for your next role
Programmers & Engineers
Sharpen edges. Mentor your team.
- Advanced track: macros, parametrics, probing, custom canned cycles
- Automation module: pallet pools, robotics, lights-out strategy
- Use lessons as on-the-floor training material
- Bridge the gap between operator and programmer skill levels
- GD&T module for design-for-manufacturability discussions
GCA teaches. OAP qualifies.
G-Code Academy gives operators the theory and syntax. The Operator Acceptance Program puts them on the machine with a mentor and signs off their competency. Together they form a complete, portable record of craftsmanship.
Explore the OAP
Pass the tests. Get the certificate.
Complete the GCA test banks and unlock a branded, verifiable certificate for $12. Lists every bank you mastered — Lathe, Mill, Fanuc, Haas, GD&T and more — with a public verification URL recruiters can scan.
- Unique cert ID — GCA-XXXXXX-2026 format
- Verifiable at jobline.ai/verify/your-id
- Print, share, attach to your LinkedIn or résumé
- Built on the same standard employers use for OAP
Common questions.
Is G-Code Academy free?
Yes — the free tier covers the Beginner track on both Lathe and Mill, plus core G-code reference. Pro unlocks Intermediate, Advanced, Automation, GD&T, all controller test banks, and certification tests.
What controllers are covered?
Fanuc, Haas, Siemens, and Heidenhain — each with its own syntax notes and dedicated test bank. Generic mill, lathe, mill-turn, and Swiss templates are also supported.
How does it work with the Operator Acceptance Program (OAP)?
GCA teaches the theory and syntax. OAP qualifies the operator on a specific machine with mentor sign-off. Milestone badges from GCA flow into the operator's OAP profile and stay with them for life.
Do I need to install anything?
No. Everything runs in the browser. Sign in with Google to save progress, badges, and machine experience to your portable profile.
Can I use this without a JobLine.ai account?
Yes. Standalone learner mode is free and requires only a Google sign-in to save your progress. No employer or organization required.
Start learning. It's free.
Open the Academy in your browser. No install. No credit card. Save your progress with Google.