Heidenhain Program Simulator

Verify the TNC program the way the control runs it — without tying up the machine

Heidenhain programmers know their TNC already has a test graphic. So the useful question isn't "can I simulate?" — it's "can I verify my program without occupying the control, and can I trust the check on the programs I actually run?" Because a Heidenhain program isn't generic G-code: it's Klartext, or DIN/ISO, driven by Q-parameters and rich cycles, often edited right at the control. That's the program that needs proving out, and doing it on the machine means the machine isn't making parts.

Eureka 3X Pro emulates the Heidenhain TNC control off-machine, so you can verify the real program — Klartext or ISO, Q-parameters and cycles included — on a controller-accurate twin, while the control keeps cutting.

This page covers 3-axis Heidenhain milling (X, Y, Z). Eureka 3X Pro verifies 3-axis programs only — no rotary 4th axis or 5-axis work. See the FAQ for scope.

Where Heidenhain programs go wrong

The TNC's strengths — parametric power and deep cycle programming — are also where the risks concentrate, especially once a program has been touched at the control:

• Q-parameters and part-family logic. Q-parameters carry values and drive conditional logic through the program. A static graphic can't tell you where a Q-parameter actually sends the tool on a given run; only executing the logic can.
• Cycles. The TNC's drilling, pocket, and thread cycles carry parameters — depths, feeds, retract behavior — that execute on the control. A wrong cycle parameter is a broken tap or a scrapped bore, and it isn't visible as a bad-looking path.
• Work offsets and datums. A program proven at one datum, then run against a different active offset on the machine, cuts in the wrong place — correct geometry, wrong origin.
• Tool data. A wrong tool number or a length/radius value that resolves differently than assumed drives the tool where the picture never showed.
• Hand edits at the control. Heidenhain programming is often done and tuned right at the TNC, so the program that runs frequently isn't the one that was originally proven out.

Why the on-control test graphic isn't the whole answer

The TNC's built-in simulation is genuinely useful — but it runs on the control, which creates two limits. First, using it ties up the machine: every minute spent verifying at the control is a minute the spindle isn't cutting, which is the opposite of what a busy shop wants. Second, if you program the TNC through a CAM system, that CAM's simulation runs on its own toolpath — not on the TNC executing your posted program — so it can't emulate how the control resolves a cycle, a Q-parameter, or an active offset at runtime, and it can't see anything you edited at the control.

Off-machine controller emulation solves both: you verify the real program, the way the TNC will execute it, on a computer — freeing the control to keep making parts.

Where Eureka 3X Pro fits

Open your Heidenhain program in Eureka 3X Pro and simulate it against a controller-accurate 3-axis TNC twin — real travels and axis limits, real work-offset and tool behavior, real cycle and Q-parameter execution, real material removal. You catch the cycle-parameter mistake, the wrong active offset, and the Q-parameter that drives somewhere unexpected before they reach the spindle — and off-machine, so verification never competes with production for control time. You also get a controller-accurate cycle time from the real program, the number to quote from.

Whether the program comes from a CAM post or was written and edited at the control, you verify the file that actually runs.

Take your most Q-parameter- and cycle-heavy TNC program and run it through the Heidenhain twin — off the control, while the machine keeps cutting. That's verification that doesn't cost you spindle time.

Eureka 3X Pro — 30-day free trial, no credit card required.

FAQ

Does Eureka 3X Pro simulate the Heidenhain TNC control? Yes. It emulates the TNC and executes your real program on a controller-accurate 3-axis twin — cycles, Q-parameters, work offsets, and tool behavior — rather than drawing a generic toolpath, and it runs off-machine so it doesn't tie up the control.

Does it handle Klartext, or only DIN/ISO? It's built to verify the real Heidenhain program on a TNC twin. If your workflow depends on a specific program format, confirm the exact input support for your control with a quick check — the certified TNC twin is what makes the verification faithful either way.

Will it catch a Q-parameter or cycle-parameter error? Those are control-execution issues, which is what controller emulation is for. Because the twin executes the logic, a Q-parameter that drives the tool somewhere unexpected, or a wrong cycle retract, shows up before it reaches the machine.

Why not just use the TNC's own test graphic? You can — but it runs on the control, so it occupies the machine, and if your program came from CAM, the CAM's own simulation isn't the TNC executing your posted program. Off-machine emulation verifies the real program without taking the control out of production.

My Heidenhain machine runs 5-axis work. Is that supported? No. Eureka 3X Pro verifies 3-axis milling (X, Y, Z) only. If you run 3-axis jobs on the TNC, you're covered. For 5-axis, mill-turn, or multi-channel Heidenhain work, that's handled by the enterprise-grade simulator in the same family, Eureka G-Code — see eureka-sim.com.

Run every G-code program risk-free — before it touches your machine.