CNC Milling Simulator

CNC Milling Simulator

0 = infinite (spiral creation)
Supported codes:
G0 – Rapid traverse (red)
G1 – Linear interpolation (green)
G2 / G3 – Circular interpolation CW / CCW
G15 / G16 – Disable / enable polar coordinates
G52 – Local coordinate origin shift (offset)
G68 / G69 – Coordinate system rotation / cancel
G90 / G91 – Absolute / incremental programming
,R / ,C – Radius / chamfer
I, J – Arc center (incremental from X, Y)
#1...#999 – Macros and variables in brackets [#1*5+#2]
This application was created by Tomáš Tvrdík of Ledeč nad Sázavou.
G90 | G15
X: 0.00 Y: 0.00
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About the CNC Milling Simulator

This simulation tool lets you interactively verify milling toolpaths for Fanuc controls. It supports advanced features such as polar coordinates (G16/G15), coordinate system rotation (G68/G69), local coordinate shifts (G52), corner radii (,R), chamfers (,C), and Fanuc macros and variables.

2D CNC Milling Simulator (Fanuc Control)

Watch a demonstration of the 2D milling simulator. It follows real Fanuc control rules, including linear and circular interpolation, coordinate-origin shifts and toolpath checking in the XY plane.

Detailed Guide to the 2D CNC Milling Simulator (Fanuc Control)

This web simulator provides precise milling toolpath checking in the XY plane with depth evaluation along Z. Its server-side calculation engine fully interprets standard Fanuc control syntax, including macros, polar coordinates, coordinate system rotation, and direct chamfering or corner rounding.

Supported G-codes and Fanuc Syntax

Code / Format Funkce Simulator behavior
G0 / G00 Rychloposuv Rapid tool movement without material removal, displayed as a red dashed line.
G1 / G01 Linear interpolation Cutting feed movement. The line darkens dynamically according to the programmed Z depth.
G2 / G3 Circular interpolation CW (G2) or CCW (G3) circular arc. Supports radius programming R and center vectors I, J. A spiral is drawn when the start and end radii differ.
G15 / G16 Polar coordinates G16 enables polar mode (X specifies the radius and Y the angle in degrees). G15 disables polar mode.
G52 Local coordinate origin shift Shifts the program's local origin (X, Y). A blue coordinate cross marks the shifted origin on the canvas.
G68 / G69 Coordinate rotation G68 X... Y... R... rotates all following code around the specified center by angle R. G69 cancels the rotation.
G90 / G91 Absolute / Incremental Switches between absolute positioning (G90) and incremental programming (G91).
,R a ,C Direct corner rounding and chamfering Fanuc syntax at the end of a G1 block: ,C creates a chamfer, ,R creates a tangential corner radius.
#1 to #999 Macros and expressions Supports variables and mathematical functions: SIN, COS, TAN, SQRT, ABS, ROUND, FIX, FUP and brackets [...].

Controls and Interactive Features

Workshop recommendation: The simulator is intended for quick graphical checks of toolpath geometry and Fanuc program logic. Before running a program on a real CNC machine, always check approach planes and safe Z-axis retracts.