WhatisCNC?

CNC stands for Computerized Numerical Control — the computer-controlled numerical operation of machine tools. Instead of manually machining a workpiece, the CNC controller interprets digital commands (G-code) and converts them into highly precise tool movements.

Modern CNC machines achieve positioning accuracies of ±0.005 mm and operate fully automatically — 24 hours a day, 7 days a week. This technology forms the backbone of industrial metalworking and has almost entirely replaced conventional lathes and milling machines.

The process from design to finished part follows a clear chain:

1. Create CAD model — The part is designed on the computer (3D model or 2D drawing)
2. CAM programming — NC code (G-code) is automatically generated from the model, defining all tool movements
3. Set up the machine — Clamp the workpiece, insert tools, set the zero point
4. Automatic machining — The CNC controller runs the program: milling, turning, drilling — all possible in a single setup
5. Quality control — Dimensional inspection with calipers, micrometers, or a CMM

At Strobel Industry, we use TopSolid CAD/CAM — an integrated solution that translates 3D models directly into optimized machine programs.

Compared to conventional machining, CNC offers decisive advantages:

CNC especially pays off for small batches (5–500 pieces) and one-off parts: once programmed, the manufacturing process is 100% reproducible.

The most important CNC-controlled manufacturing processes:

• CNC Milling — Rotating tools remove material from the stationary workpiece. Ideal for housings, plates, and freeform surfaces. → More about CNC Milling
• CNC Turning — The workpiece rotates while a stationary tool removes material. Typical for shafts, bolts, and bushings. → More about CNC Turning
• CNC Drilling — Precision holes with defined depth, diameter, and position
• CNC Grinding — Finishing for the highest surface quality (Ra < 0.4 µm)
• CNC EDM — Electrical discharge machining for hardened materials and delicate contours

Strobel Industry offers CNC milling up to 700 mm travel (5-axis) and CNC turning up to Ø250 mm — all from a single source.

Every CNC machine understands G-code — a standardized machine language consisting of commands such as:

• G0 — Rapid traverse (fast positioning without machining)
• G1 — Linear interpolation (straight cut at defined feed rate)
• G2 / G3 — Circular arc clockwise/counterclockwise
• M3 — Spindle on (clockwise rotation)
• M6 — Tool change

In modern manufacturing, G-code is no longer written manually but automatically generated from the 3D model by CAM software. The programmer optimizes strategies, sequences, and cutting data — the software generates the actual code.