CNC · Visualizer · Interactive explainer

CNC cutter compensation visualizer

See what G41, G42, and G40 actually do to the tool centerline on an outside profile or inside pocket, with contour-direction guidance and lead-in sanity checks instead of one static diagram.

Setup

Results update instantly. Use the button only if you want a shareable URL.

Unit system

Scenario

Contour direction

Comp command

Tool diameter

Nominal width

Nominal height

Lead-in length

Lead-out length

Why this page is useful

Targets search intent around G41, G42, cutter comp left versus right, and lead-in confusion.
Shows the programmed contour and actual tool centerline together, which is the missing picture in many static tutorials.
Keeps both metric and imperial mode for shop notes, manuals, and setup sheets.

This is a planning and teaching view, not a controller emulator. It does not model wear tables, exact controller alarm rules, or arc-specific lead moves. It is there to make the side-of-cut logic legible before you prove it out at the machine.

Read the launch note for this CNC tool.

Summary

Contour view

What to watch

Quick map

Scenario	CW	CCW
Outside profile	`G41`	`G42`
Inside pocket	`G42`	`G41`

That table assumes the programmed path is the finished contour and you want the tool centerline offset onto the correct side of it.