Choosing the right software for your CNC plasma table is one of the first decisions you'll face after assembly, and it affects every cut you'll make going forward. The landscape includes professional CAM suites that cost hundreds of dollars, free open-source tools with steep learning curves, and everything in between. This guide breaks down what to look for and compares the most popular options so you can make an informed choice.
What Plasma Cutting Software Actually Does
Before comparing options, it's worth understanding the three distinct stages of the plasma cutting workflow and which software handles each one:
- CAD (Design): Creating or editing the 2D geometry you want to cut. This is where you draw shapes, import files, add text, and lay out your design.
- CAM (Manufacturing): Converting that geometry into toolpaths — adding kerf compensation, lead-ins, pierce points, cut sequence, and nesting. This is the critical middle step that determines cut quality.
- Post-Processing: Translating toolpaths into the specific G-code dialect your CNC controller understands. Different controllers need different output — Mach3 expects different codes than LinuxCNC, which expects different codes than FireControl.
Some tools handle one stage. Some handle two. A few handle all three. The fewer tools in your chain, the less time you spend importing, exporting, and troubleshooting format conversions.
Key Features to Evaluate
When comparing plasma cutting software, these are the features that matter most for day-to-day productivity:
- File import: Can it read DXF and SVG files reliably? Does it handle unit conversion and path cleanup? If you frequently download designs from the web, SVG import is essential. If you work with CAD-generated drawings, DXF support is non-negotiable.
- Kerf compensation: Does it support inside and outside kerf with automatic direction detection? Can you override individual paths? This is the single most important CAM feature for dimensional accuracy.
- Lead-in/lead-out control: Can you set lead-in type (line vs arc), length, and angle? Does it automatically place lead-ins outside the finished part? Poor lead-in placement leaves visible marks on your finished edges.
- Nesting: Can it automatically arrange multiple parts on a sheet to minimize waste? For production work, nesting efficiency directly impacts your material cost per part.
- Controller support: Does it generate G-code for your specific controller? Generic G-code often doesn't work — you need output tuned for Mach3's M-codes, LinuxCNC's O-words, FireControl's formatting, or whatever your machine runs.
- THC integration: Does the post-processor include Torch Height Control commands? If your table has THC, the G-code needs to enable, disable, and configure it appropriately.
- Cut simulation: Can you preview the cut sequence before sending it to the machine? Simulation catches cut order issues, missed pierce points, and path direction problems before they waste material.
Software Comparison
SheetCAM
SheetCAM is the most widely used dedicated plasma CAM software. It's a desktop application (Windows, Linux) focused specifically on 2D profile cutting. It handles kerf, lead-ins, nesting, and post-processing well, with a large library of post-processor profiles for various controllers.
- Strengths: Mature and stable, extensive post-processor library, good nesting for a mid-range tool, active user community.
- Limitations: No built-in CAD — you need a separate program (Inkscape, LibreCAD, Fusion 360) to create designs. The UI feels dated. Costs $150+ for a license.
- Best for: Experienced operators who already have a CAD workflow and want a reliable, dedicated CAM tool.
Fusion 360 (with Manufacture workspace)
Autodesk's Fusion 360 is a full-featured CAD/CAM/CAE suite that includes a 2D plasma cutting workflow in its Manufacture workspace. It's dramatically more powerful than a dedicated plasma tool, covering 3D modeling, simulation, and multi-axis machining.
- Strengths: Professional CAD capabilities, parametric modeling, extensive manufacturing features, free for personal use (with limitations).
- Limitations: Massive learning curve for users who just want to cut flat parts. The plasma workflow is a small subset of a complex application. Post-processor setup requires technical knowledge. Requires cloud account and internet connection. Free tier has restrictions on commercial use and features.
- Best for: Users who need full 3D CAD capabilities and happen to also do plasma cutting, or shops that already use Fusion for other manufacturing.
Inkscape + Post-Processor Plugins
Inkscape is a free, open-source vector editor that can be extended with G-code export plugins (like Inkscape-GCode-Tools or J Tech). This approach uses Inkscape as both CAD and rudimentary CAM, generating G-code directly from SVG paths.
- Strengths: Completely free, excellent for artistic/sign design work, huge community of tutorials and resources.
- Limitations: No real CAM features — no kerf compensation, no lead-ins, no nesting, no THC commands. The G-code plugins are basic and don't produce production-quality output for plasma. You'll spend more time manually fixing G-code than you save on software costs.
- Best for: Design only — use Inkscape for creating artwork, then export SVG and import into a proper CAM tool.
CutArc
CutArc is a free, browser-based CAD/CAM tool built specifically for plasma cutting. It combines design, CAM, and post-processing in a single application with no software to install.
- Strengths: All-in-one workflow (design, import, CAM, post-processing) in a single tool. Free with no feature restrictions. Browser-based — works on any OS with no installation. Purpose-built for plasma with 12+ controller profiles. Includes image tracing, text tools, nesting, kerf compensation, simulation, and THC support.
- Limitations: Browser-based means it requires an internet connection. Newer than established tools so the community is smaller. 2D only — no 3D modeling capabilities.
- Best for: Operators who want a single, free tool that handles the complete plasma cutting workflow without installing software or managing multiple programs.
Quick Comparison Table
| Feature | SheetCAM | Fusion 360 | Inkscape | CutArc |
|---|---|---|---|---|
| Price | $150+ | Free (limited) | Free | Free |
| Platform | Desktop | Desktop + Cloud | Desktop | Browser |
| Built-in CAD | No | Yes (3D) | Yes (vector) | Yes (2D) |
| Kerf Compensation | Yes | Yes | No | Yes |
| Lead-ins | Yes | Yes | No | Yes |
| Nesting | Basic | With extension | No | Yes |
| DXF Import | Yes | Yes | Limited | Yes |
| SVG Import | No | Limited | Native | Yes |
| Image Tracing | No | No | Yes | Yes |
| Controller Profiles | Many | Custom post | Generic | 12+ |
| Learning Curve | Moderate | Steep | Moderate | Low |
Making Your Decision
The right software depends on your situation:
- If you want the simplest path from design to cut and don't want to manage multiple programs, CutArc gives you everything in one browser tab at zero cost.
- If you already have a CAD workflow (you design in AutoCAD, Fusion 360, or SolidWorks) and just need a CAM tool to generate plasma G-code, SheetCAM is the proven choice.
- If you do 3D work, milling, and plasma and want one application for everything, Fusion 360 covers the most ground — but expect a significant time investment to learn it.
- If you're just getting started and want to cut your first parts without spending money or fighting software, start with CutArc. You can always add specialized tools later as your needs grow.
The best plasma cutting software is the one that gets you from design to clean cut with the least friction. Features that look impressive in a comparison table don't matter if you never use them. Start with a tool that matches your current skill level and workflow, and upgrade when you hit a genuine limitation — not before.