With the widespread use of CAM software, many assume engineers no longer need to understand G-code. In reality, this assumption often leads to machining errors and inefficiencies, because G-code remains the only language a CNC machine actually executes.
G-code is the execution layer between design intent and machine motion. Understanding it enables engineers and machinists to verify CAM output, troubleshoot unexpected behavior, and control risk on the shop floor. G-code literacy is therefore not about replacing CAM, but about ensuring safe, accurate, and reliable CNC machining.

What Is G-Code? — Definition, Origin, and Standards

G-code is often treated as a collection of machine commands, but in engineering terms it is a standardized motion and control language that bridges CNC programming logic and physical machine behavior. Understanding its origin and structure clarifies why G-code still underpins all modern CNC machining.

What Does G-Code Mean in CNC Programming?

G-code stands for Geometric (or Preparatory) Code. In CNC programming, it defines how a machine should move and how a machining operation should be prepared and executed.
From a control-system perspective, G-code:
  • Specifies axis motion (linear, circular, rapid, interpolated)
  • Defines coordinate systems, planes, and offsets
  • Controls feed modes, motion states, and interpolation logic
G-code does not describe geometry the way CAD does, nor does it optimize toolpaths like CAM software. Instead, it functions as the execution-level instruction set that the CNC controller interprets line by line. Every CAM-generated program is ultimately translated into G-code because this is the only language CNC controllers execute deterministically.

RS-274 and ISO 6983 — The Standards Behind G-Code

The roots of G-code trace back to RS-274, developed in the 1950s by the U.S. Air Force to standardize numerical control of machine tools. Its goal was not elegance, but repeatable, machine-readable motion control.
Later, this concept was formalized internationally as ISO 6983, which defines:
  • Word-address format (G, M, X, Y, Z, F, S, etc.)
  • Modal vs non-modal commands
  • Line-by-line execution logic
The core idea behind ISO 6983 is procedural control: the programmer specifies explicit machine actions rather than abstract geometry.
However, real-world G-code is not fully unified. CNC manufacturers (Fanuc, Siemens, Haas, Heidenhain, etc.) extend or modify the standard to support proprietary cycles, macros, and machine-specific functions. As a result:
  • Basic G-code concepts are shared
  • Advanced commands and syntax vary by controller

Engineering Insight

G-code is best understood as a family of closely related dialects, all rooted in RS-274 / ISO-6983. Engineers who understand this foundation can read, debug, and validate CNC programs across different machines—an essential skill for controlling machining accuracy, safety, and repeatability in real production environments.

How Does G-Code Control a CNC Machine?

At a practical level, G-code controls a CNC machine by converting text-based instructions into coordinated physical motion. Every line of code participates in a deterministic control loop that links programming intent to servo-driven axis movement.

From Program to Motion — CNC Control Logic Explained

The control chain can be summarized as:
G-code program → CNC controller → servo system → machine motion
  1. G-code interpretation The CNC controller reads each block of G-code sequentially. Commands are parsed into motion instructions (axis positions, feed rates, spindle states) and logical states (active planes, offsets, modes).
  2. Interpolation calculation For motion commands, the controller performs interpolation—calculating intermediate points between the start and end positions.
    1. Linear interpolation (e.g., straight-line moves)
    2. Circular interpolation (arcs in defined planes)
  3. Interpolation ensures coordinated multi-axis movement so that the tool follows the programmed path accurately, even when several axes move simultaneously.
  4. Servo execution Interpolated position data is sent to the servo drives. Feedback from encoders allows the controller to continuously correct position, speed, and acceleration, maintaining accuracy under load.
From an engineering perspective, machining accuracy depends not only on the G-code path, but on how smoothly the controller interpolates and how effectively the servo system follows those commands.

Modal vs Non-Modal Commands

A critical concept in G-code control is the distinction between modal and non-modal commands.
Modal commands
  • Remain active until explicitly changed
  • Define the current machining “state”
Examples include motion mode, feed mode, coordinate system, and plane selection. Once set, these commands continue to affect all subsequent blocks, which is why unintended modal states are a common source of machining errors.
Non-modal commands
  • Apply only to the block in which they appear
  • Do not persist beyond that line
These are typically used for single actions such as reference moves or specific canned operations.

Engineering Insight

G-code does not “describe geometry” in a high-level sense—it controls machine behavior through state-based logic and interpolated motion. Engineers who understand how controllers interpret modal states and generate interpolated paths can:
  • Predict tool motion more accurately
  • Diagnose unexpected behavior faster
  • Reduce setup errors and collision risk
This control logic is the foundation upon which all CNC machining reliability is built.

What Does a Typical G-Code Program Look Like?

A G-code program is not a long, unreadable string of commands. It follows a clear, structured format designed for deterministic execution by a CNC controller. Understanding this structure allows engineers and machinists to read, verify, and troubleshoot programs efficiently—whether they are written manually or generated by CAM software.

Program Blocks, Lines, and Address Words

A G-code program is composed of blocks, also called lines. Each block represents one logical step in machine execution.
Block (line) characteristics
  • One command line, executed sequentially
  • Typically ends with an end-of-block character
  • Can contain motion, speed, tool, and logic instructions
Within each block are address words, which define specific actions or parameters.
Common address words include:
  • X / Y / Z — axis positions
  • F — feed rate
  • S — spindle speed
  • T — tool selection
  • G — motion or mode command
  • M — auxiliary or machine command
Each address word consists of a letter + numerical value, and their combination defines how the machine behaves in that block. The order of words is usually flexible, but clarity and consistency are critical for readability and debugging.

Program Start, Execution, and End

Most CNC programs follow a predictable lifecycle:
  1. Program initialization
  • Safety setup (units, planes, modes)
  • Coordinate system and offset activation
  • Tool selection and spindle preparation
This section establishes a known, safe machine state and prevents inherited modal settings from previous programs.
  1. Machining execution
  • Rapid positioning to safe locations
  • Controlled feed moves for cutting
  • Repeated toolpaths and canned cycles
This is the core of the program, where material is actually removed. Logical sequencing and clear structure reduce the risk of collisions and machining errors.
  1. Program end and reset
  • Tool retraction to a safe position
  • Spindle and coolant shutdown
  • Program end command and controller reset
A well-defined ending ensures the machine is left in a safe, predictable state for the next operation.

Engineering Perspective

A typical G-code program is best viewed as a state-controlled execution script, not just motion commands. Engineers who understand block structure and program flow can:
  • Quickly validate CAM output
  • Identify unsafe or inefficient logic
  • Improve first-article success and setup reliability
This structural literacy is a foundational skill for controlling CNC machining quality and risk.

Common G-Code Commands Used in CNC Machining

While G-code includes hundreds of possible commands, a relatively small set controls most real machining behavior. Understanding what these commands do—and when they matter—allows engineers and machinists to read programs critically, validate CAM output, and prevent costly errors. The focus here is not exhaustive listing, but engineering intent and practical use.

Motion Commands — How the Tool Moves

Motion commands define how the tool travels through space. They are modal and remain active until replaced.
G00 — Rapid positioning
  • Moves axes at maximum machine speed
  • Used for non-cutting motion only
  • No feed rate control
Engineering note: G00 is a common source of collisions if Z-clearance or fixture geometry is misjudged. CAM simulations may miss real machine acceleration limits or tool length differences.
G01 — Linear interpolation (cutting move)
  • Controlled feed-rate motion
  • Used for actual material removal
Engineering note: Surface finish and dimensional accuracy are directly influenced by feed rate (F) during G01 moves.
G02 / G03 — Circular interpolation
  • G02: clockwise arc
  • G03: counterclockwise arc
  • Requires plane selection (G17/G18/G19)
Engineering note: Arc moves reduce file size and improve surface continuity, but controller-specific arc handling can affect accuracy on small radii.

Plane, Units, and Coordinate Modes — Defining the Machining Context

These commands establish the interpretation framework for all motion.
Plane selection
  • G17 — XY plane (most milling operations)
  • G18 — XZ plane
  • G19 — YZ plane
Plane selection determines how circular interpolation (G02/G03) is calculated.
Units
  • G20 — Inch mode
  • G21 — Metric mode
Engineering risk: Unit mismatches are catastrophic errors. Always define units explicitly at program start.
Coordinate modes
  • G90 — Absolute positioning
  • G91 — Incremental positioning
Absolute mode (G90) is more predictable for complex programs, while incremental mode (G91) is useful for repetitive or relative moves—but easier to misuse.

Tool Length and Cutter Compensation — Matching Code to Reality

These commands align programmed geometry with real tooling.
G43 / G49 — Tool length compensation
  • G43 activates tool length offset
  • G49 cancels it
Engineering note: Tool length compensation allows one program to work with different tool holders, but incorrect offsets are a leading cause of crashes.
G41 / G42 — Cutter radius compensation
  • G41: cutter left
  • G42: cutter right
These commands shift the toolpath to account for tool diameter, enabling:
  • Fine dimensional tuning at the machine
  • Tool wear compensation without editing geometry
Engineering boundary: Cutter compensation requires proper lead-in/lead-out moves. Poorly generated CAM code often disables G41/G42 to avoid errors, reducing flexibility at the machine.

Engineering Takeaway

Command Group Controls Why It Matters
Motion (G00–G03) Tool movement Safety, surface quality
Planes / Modes Interpretation logic Predictability, correctness
Compensation Tool–geometry alignment Accuracy, adjustability
These G-code commands are not just syntax—they define machine behavior. Engineers who understand their intent can identify unsafe moves, improve machining stability, and reduce reliance on blind trust in CAM-generated code.

How Coordinate Systems and Work Offsets Work in G-Code

Coordinate systems are one of the most critical—and most misunderstood—parts of G-code programming. Many machining errors that appear to be “toolpath problems” are actually coordinate definition problems. Understanding how machine and work coordinates interact is essential for safe setup, repeatable accuracy, and multi-part efficiency.

Machine Coordinate vs Work Coordinate

Machine coordinate system (Machine Zero) The machine coordinate system is the absolute reference defined by the CNC machine itself.
  • Established by the manufacturer and confirmed during machine homing
  • Fixed and non-negotiable
  • Represents the full travel limits of each axis
All motion ultimately occurs in machine coordinates, even though programmers rarely program directly in this system.
Work coordinate system (Work Zero) The work coordinate system defines the part-specific origin used for machining.
  • Set by the setup engineer based on fixturing and datums
  • Translates part geometry into machine motion
  • Allows the same program to run on different setups or machines
From an engineering standpoint, the work coordinate system is the bridge between design intent and physical setup. Incorrect work zero definition is one of the most common causes of tool crashes and dimensional errors.

Work Offsets in Practice (G54–G59, G52)

Standard work offsets: G54–G59 G54 through G59 store predefined offsets between machine zero and work zero.
Typical uses:
  • Single-part setup: one offset (e.g., G54) defines the part origin
  • Multiple vises or fixtures: each part location uses a different offset
  • Repeat production: offsets allow fast re-setup without reprogramming
This approach separates program logic from setup variability, which is essential for scalable CNC manufacturing.
Local offset: G52 G52 applies a temporary shift to the active work coordinate system.
Engineering use cases:
  • Fine-tuning zero without altering stored offsets
  • Subprogram-based machining patterns
  • Special positioning within a larger fixture
Because G52 stacks on top of existing offsets, improper use can easily lead to unexpected motion. For this reason, many shops restrict its use to experienced programmers.

Fixturing Logic and Engineering Practice

From a manufacturing perspective:
  • Work offsets should align with functional datums, not arbitrary corners
  • Z-zero selection (top of part vs fixture surface) directly affects tool length logic
  • Consistent offset strategy improves inspection repeatability and first-article approval
In multi-part or palletized machining, disciplined use of G54–G59 dramatically reduces setup time while maintaining accuracy across batches.

Engineering Takeaway

Coordinate systems are not abstract math—they are physical setup logic encoded in G-code. Engineers and machinists who understand how machine coordinates, work offsets, and fixturing interact can:
  • Prevent collisions during setup changes
  • Reuse programs across fixtures and machines
  • Maintain dimensional consistency in multi-part production
Mastery of work offsets is a cornerstone of reliable, production-grade CNC machining.

G-Code vs M-Code — What’s the Difference in Practice?

In CNC programming, G-code and M-code serve fundamentally different roles, yet they must work together to execute a machining operation correctly. Confusing their responsibilities is a common source of program logic errors.

Functional Responsibility: Geometry vs Machine Control

G-code is responsible for path and geometry control. It tells the machine where and how to move:
  • Linear and circular motion (toolpaths)
  • Coordinate systems, planes, and modes
  • Feed behavior and interpolation logic
In short, G-code defines the tool’s motion relative to the workpiece.
M-code, by contrast, controls machine-level functions:
  • Spindle start/stop and rotation direction
  • Coolant on/off
  • Tool changes and auxiliary actions
M-codes do not define geometry. They control the state of the machine hardware that enables machining to occur.

How G-Code and M-Code Work Together

In real machining, G-code and M-code are interdependent.
Example workflow:
  1. M06 — change to the required tool
  2. S and M03 — set spindle speed and start spindle
  3. G00 / G01 / G02 / G03 — execute cutting motion
  4. M08 — activate coolant during cutting
  5. M05 / M09 — stop spindle and coolant at operation end
G-code handles motion and accuracy, while M-code ensures the machine is in the correct operational state to safely execute that motion.

Engineering Perspective

Code Type Controls Engineering Impact
G-code Motion, geometry, modes Accuracy, surface quality
M-code Machine functions Safety, process stability
Understanding the division of responsibility allows engineers to:
  • Read CNC programs more logically
  • Debug machining issues faster
  • Identify whether a problem is geometric (G-code) or operational (M-code)
In practice, reliable CNC machining depends on the correct coordination of both, not on either code type in isolation.

Advanced G-Code Programming Features Engineers Should Know

Beyond basic motion commands, modern CNC machining relies on advanced G-code features to improve efficiency, consistency, and scalability. These capabilities are often underused or hidden behind CAM software, yet they are critical for engineers responsible for process optimization, cycle time reduction, and robust production.

Canned Cycles (G81–G89)

Canned cycles are predefined machining routines that package multiple axis motions into a single command. They are most commonly used for hole-making operations, where motion logic is repetitive and well defined.
Typical examples include:
  • G81 — simple drilling
  • G83 — peck drilling (chip breaking)
  • G84 — tapping
  • G85–G89 — boring and reaming variants
Engineering significance
  • Reduce program length and improve readability
  • Ensure consistent approach, depth, and retract behavior across holes
  • Lower the risk of manual programming errors
From a manufacturing standpoint, canned cycles also simplify feed and depth adjustments during setup or optimization, since changes can be made at the cycle level rather than rewriting individual moves.

Macros, Variables, and Conditional Logic

Macros extend G-code from a linear command list into a parameter-driven control language.
Key elements include:
  • Variables (e.g., #1, #100) to store dimensions, feeds, or offsets
  • Arithmetic operations to calculate positions or step sizes
  • Conditional logic (IF/WHILE/DO) to control program flow
Engineering advantages
  • Parametric programming allows one program to machine multiple part sizes by changing variables
  • Looping enables efficient handling of repetitive features (hole patterns, slot arrays)
  • Conditional logic supports error checking, tool wear compensation, and adaptive behavior
In batch production or family-of-parts scenarios, macros significantly reduce programming effort while improving consistency.

Practical Manufacturing Impact

Advanced G-code features are especially valuable when:
  • CAM output must be adjusted quickly on the shop floor
  • Multiple fixtures or part variants share the same geometry logic
  • Cycle time and repeatability are critical to cost control
Engineers who understand canned cycles and macro programming are better equipped to:
  • Diagnose CAM limitations
  • Build flexible, reusable CNC programs
  • Reduce setup time and operator intervention

Engineering Takeaway

Advanced G-code is not about writing complex programs for their own sake. It is about encoding machining intent efficiently and reliably. Mastery of canned cycles and macro logic enables engineers to bridge the gap between CAM automation and real-world CNC production demands—an advantage rarely addressed in basic G-code guides.

How G-Code Is Generated, Tested, and Verified in CNC Production

In real CNC production, G-code is not simply “exported and run.” It goes through a generation–verification–proofing workflow designed to minimize collision risk, dimensional error, and scrap—especially for first articles and tight-tolerance parts.

CAM-Generated vs Manually Edited G-Code

CAM-generated G-code CAM systems translate CAD geometry and toolpath strategies into controller-specific G-code. Their strengths are:
  • Rapid programming of complex geometry
  • Consistent application of feeds, speeds, and stepovers
  • Integrated collision checks within the CAM environment
However, CAM output is generic by necessity. It may not fully reflect:
  • Machine-specific acceleration limits
  • Fixture nuances and setup preferences
  • Shop standards for safety moves, probing, or tool changes
Manually edited G-code Experienced engineers and machinists often edit CAM output to:
  • Add or refine safety clearances
  • Optimize lead-ins, lead-outs, or retracts
  • Insert probing cycles, dwell logic, or macro calls
Engineering intervention point The goal is not to replace CAM, but to validate and adapt its output. Manual edits are most valuable where CAM assumptions diverge from real machine behavior.

Simulation, Dry Run, and Proofing

Simulation (offline or controller-based) Simulation checks tool motion against part geometry, fixtures, and machine limits. It is effective for identifying gross errors, but:
  • It relies on accurate digital models
  • It may not capture real spindle dynamics or tool deflection
Dry run (air cutting) A dry run executes the program without material removal, often with reduced feed and spindle speed. This step verifies:
  • Correct coordinate systems and work offsets
  • Safe rapid moves and retracts
  • Logical program flow and tool changes
Dry runs are especially critical after setup changes or manual edits.
First-article proofing The first physical part validates:
  • Dimensional accuracy
  • Surface finish and tool engagement
  • Thermal and deflection effects not visible in simulation
Measurements from the first article often lead to minor G-code adjustments (feeds, compensation, offsets) before full production.

Production-Grade Verification Logic

In practice, reliable CNC production depends on layered verification:
  1. CAM generation
  2. Simulation review
  3. Dry run on the machine
  4. First-article inspection
Engineers who understand this workflow treat G-code as a controlled manufacturing artifact, not a black-box output—significantly reducing risk, rework, and startup time.

Practical G-Code Examples for Common Machining Operations

The goal of the following examples is not to teach manual programming, but to help engineers read G-code and understand what the machine is actually doing. Each example shows a simplified program fragment and explains the machining behavior it produces.

Example 1: Face Milling — Establishing a Flat Reference Surface

G21 G90 G17 G54 T1 M06 S3000 M03 G00 X-10 Y-10 Z5 G01 Z-1 F200 G01 X110 F600 G00 Z5 M05
What this code is doing (engineering view):
  • Sets metric units, absolute positioning, and XY plane
  • Activates the work offset (G54)
  • Loads a face mill and starts the spindle
  • Rapids to a safe start point above the part
  • Feeds down to a shallow depth and performs a straight cut across the surface
Manufacturing intent: This operation creates a datum surface. Feed rate, depth of cut, and toolpath length directly influence flatness and surface finish.

Example 2: Drilling — Using a Canned Cycle for Consistency

G21 G90 G54 T2 M06 S2000 M03 G00 X50 Y50 Z5 G81 Z-15 R2 F150 G80 M05
What this code is doing:
  • Positions the drill above the hole location
  • Uses G81 canned drilling cycle:
    • Rapid to R-plane (Z2)
    • Feed to drilling depth (Z-15)
    • Retract automatically
  • Cancels the canned cycle with G80
Manufacturing intent: Canned cycles ensure repeatable hole depth and feed behavior across multiple holes, reducing programming error and setup variability.

Example 3: Simple Contour Milling — Controlling Geometry with Interpolation

G21 G90 G17 G54 T3 M06 S4000 M03 G00 X0 Y0 Z5 G01 Z-5 F200 G01 X50 Y0 F500 G01 X50 Y50 G01 X0 Y50 G01 X0 Y0 G00 Z5 M05
What this code is doing:
  • Moves the end mill down to cutting depth
  • Executes a rectangular contour using linear interpolation
  • Retracts safely after completing the profile
Manufacturing intent: This illustrates how geometry is approximated by controlled linear motion. Accuracy depends on coordinate mode (G90), feed stability, and tool deflection—not just the programmed path.

Engineering Takeaway

Across these examples:
  • G-code defines machine behavior, not design intent
  • Feed, depth, and motion mode directly affect quality and risk
  • CAM systems generate similar structures—understanding them allows verification and optimization
Engineers who can interpret examples like these are better equipped to:
  • Validate CAM output
  • Diagnose machining issues
  • Communicate effectively with CNC programmers and operators
This practical literacy is where G-code knowledge delivers real manufacturing value.

Common G-Code Mistakes and How to Avoid Them

Most CNC machining incidents are not caused by complex logic errors, but by basic G-code mistakes that propagate quickly once execution starts. Understanding these failure patterns helps engineers and machinists prevent crashes, scrap, and lost setup time.

Coordinate System Errors

Problem Incorrect or undefined work offsets (e.g., wrong G54 active, missing zero setting) cause the machine to cut in the wrong location.
Consequences
  • Tool crashes into fixtures or clamps
  • Features machined at incorrect positions
  • Entire parts scrapped despite “correct” geometry
Prevention strategy
  • Always explicitly define the active work offset at program start
  • Verify work zero with a probe or dry run
  • Avoid assuming the previous program left the correct coordinate state

Residual Modal Commands

Problem Modal G-codes (such as G90/G91, G17/G18/G19, feed modes) remain active until changed. Programs that rely on inherited modal states are unsafe.
Consequences
  • Unexpected motion direction or plane
  • Incorrect arc interpretation
  • Subtle dimensional errors that are hard to diagnose
Prevention strategy
  • Initialize all critical modal states at the beginning of every program
  • Treat each program as standalone
  • Do not rely on controller defaults or prior program behavior

Feed Rate and Spindle Speed Mismatch

Problem Feed rates and spindle speeds that are incompatible with tool size, material, or operation—often inherited from CAM templates.
Consequences
  • Poor surface finish or chatter
  • Premature tool wear or breakage
  • Thermal distortion and dimensional drift
Prevention strategy
  • Cross-check feed (F) and speed (S) against tool and material data
  • Reduce feeds during first-article runs
  • Monitor cutting behavior and adjust deliberately, not reactively

Engineering Takeaway

Most G-code errors stem from state management, not syntax. Engineers who focus on coordinate logic, modal clarity, and realistic cutting parameters dramatically reduce machining risk and improve first-pass yield.

Summary — How to Use G-Code Effectively in CNC Machining

  • G-code is the execution language of CNC machines Regardless of how advanced CAD/CAM software becomes, every CNC machine ultimately follows G-code instructions. It is the final authority that controls motion, feeds, spindle behavior, and machine state.
  • Understanding structure matters more than memorizing commands Effective use of G-code comes from understanding program structure, modal behavior, coordinate systems, and control logic—not from memorizing individual G or M codes in isolation. This structural understanding allows engineers to read, verify, and troubleshoot programs with confidence.
  • Engineering-level G-code literacy reduces risk and cost Engineers who understand how G-code works can identify unsafe motions, incorrect offsets, and inefficient cutting conditions before they reach the machine. This reduces crashes, shortens setup time, improves first-article success, and stabilizes production quality.
Used correctly, G-code is not a low-level detail to ignore—it is a powerful tool for controlling accuracy, safety, and reliability in CNC machining.

FAQ

Is G-code the same for all CNC machines?

No. While G-code is based on common standards such as RS-274 and ISO 6983, real-world implementations vary by CNC controller. Different manufacturers (for example, Fanuc-type, Siemens, Haas, Heidenhain) support different syntax extensions, canned cycles, and macro formats. Core motion commands are similar, but advanced functions and even default behaviors can differ, which is why post-processing and controller awareness are essential.

Do CNC programmers still need to learn G-code?

Yes—though not necessarily to hand-write every program. Modern CAM software generates G-code automatically, but engineers and programmers must understand G-code to verify, debug, and optimize it. Without G-code literacy, it is difficult to identify unsafe moves, incorrect offsets, inefficient feeds, or controller-specific issues that CAM simulation may not reveal.

What’s the difference between CAM output and hand-written G-code?

CAM output is toolpath-driven: it converts geometry and machining strategies into G-code based on predefined templates and assumptions. Hand-written G-code is logic-driven, giving the programmer direct control over motion, states, and sequencing.
In practice:
  • CAM is ideal for complex geometry and productivity
  • Hand edits or manual code are often used to refine safety moves, probing, macros, or cycle efficiency
Most production programs are a hybrid: CAM-generated code with targeted manual refinement.

Can incorrect G-code damage a CNC machine?

Yes. G-code is the direct execution language of the CNC controller. Incorrect coordinates, missing offsets, unsafe rapid moves, or residual modal states can cause:
  • Tool crashes
  • Fixture or spindle damage
  • Axis overtravel alarms
  • Scrap or machine downtime
This is why simulation, dry runs, and first-article proofing are standard practice in professional CNC operations.

Is G-code used only for milling machines?

No. G-code is used across many CNC platforms, including:
  • Milling machines and machining centers
  • CNC lathes and turning centers
  • Wire EDM and sinker EDM
  • CNC routers, plasma cutters, and laser cutters
While the specific commands and planes may differ, the core concept of G-code as a motion and control language remains consistent.
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