Sinumerik G-Code Simulator

Verify the Siemens program your control actually executes — before it runs

Siemens Sinumerik controls don't run generic G-code. They run Siemens: CYCLE calls for drilling and pockets, R-parameters carrying values through the program, frames (TRANS, ROT, and settable work offsets) shifting the coordinate system, D-numbers selecting tool offsets — and, on plenty of shop floors, ShopMill steps and hand edits made right at the control. A verifier that only understands generic milling moves doesn't understand your program.

Eureka 3X Pro emulates the Sinumerik control and simulates the actual program the way the control will execute it — Siemens dialect and all — so what you verify is what runs.

This page covers 3-axis Sinumerik 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 Sinumerik programs go wrong

The failure modes on a Siemens control cluster around the very features that make it powerful — and around the fact that so much of a real program lives outside CAM:

• Cycles. CYCLE81/82/83 and their pocket and thread siblings carry parameters — depths, retract planes, dwell — that execute on the control, not in a CAM's geometry model. A wrong parameter is a broken tool or a scrapped bore, and it doesn't show up as a bad-looking toolpath.
• R-parameters and program logic. Siemens programs compute values at runtime through R-parameters and conditional logic. A static toolpath can't tell you where an R-parameter actually drives the tool on a given pass.
• Frames and work offsets. TRANS, ROT, and settable frames (G54 onward) shift the coordinate system. A program proven at one frame, then run at another active offset on the machine, cuts in the wrong place — geometry that was correct for the wrong origin.
• Tool offsets (D-numbers). A wrong D-number or a length/radius offset that resolves differently on the control than assumed drives the tool where the picture never showed.
• Hand edits and ShopMill. Programs edited at the control, or built as ShopMill steps, are files your CAM never generated and can't reconstruct.

Why CAM simulation misses it

If you program the Sinumerik through Fusion, Mastercam, or another CAM, its simulation runs on the CAM's own toolpath and geometry — not on the Siemens control executing the posted program. It can't emulate how Sinumerik resolves a cycle parameter, a settable frame, or a D-number at runtime, and it can't see anything edited at the control or written in ShopMill. Generic third-party back-plotters have the opposite problem: they may draw the moves but don't faithfully reproduce Siemens dialect and control behavior.

Eureka 3X Pro closes that gap by emulating the control itself: it reads the real program and executes the Siemens dialect the way the machine will.

Where Eureka 3X Pro fits

Open the posted or hand-written program in Eureka 3X Pro and simulate it against a controller-accurate 3-axis Sinumerik twin — real travels and axis limits, real frame and work-offset behavior, real cycle and tool-offset resolution, real material removal. You catch the cycle-parameter mistake, the wrong active frame, and the bad D-number before they reach the spindle, and you get a controller-accurate cycle time from the real program — the number you can actually quote from.

For CAM users, the posted program comes straight in; for the hand-editing and ShopMill crowd, you open the program directly. Either way, what you verify is what the control runs.

Take your most cycle- and R-parameter-heavy Siemens program and run it through the Sinumerik twin. That's the file a generic simulator can't really read — and the one most worth proving out.

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

FAQ

Does Eureka 3X Pro emulate the Siemens Sinumerik control? Yes. It simulates the actual program executing on a controller-accurate Sinumerik twin, including Siemens dialect behavior — cycles, R-parameters, frames and settable work offsets, and tool offsets — rather than drawing a generic toolpath.

Can it verify programs edited at the control or written in ShopMill? Yes. It reads the real program regardless of origin, so hand-edited and control-side programs verify the same as posted ones.

Will it catch a wrong cycle parameter or work-offset error? Those are control-execution issues, which is exactly what controller emulation is for. A wrong retract plane in a drilling cycle or the wrong active frame shows up in the simulation before it reaches the machine.

My Sinumerik machine runs 4- or 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 Sinumerik, you're covered. For rotary, 4/5-axis, mill-turn, or multi-channel Siemens work, that's handled by the enterprise-grade simulator in the same family, Eureka G-Code — see eureka-sim.com.

Do I need a CAM system to use it? No. It works from the program directly, so hand-written and control-edited Siemens programs verify without any CAM involved.

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