Understanding Casting-CNC Machining

When it comes to CNC machining castings, the machining strategy and performance of the machine & cutter combination directly influences part precision, consistency, and turnaround time.

Not all CNC machines are created equal—understanding their core specifications helps both engineers and buyers make better manufacturing decisions.

Here are key CNC milling machine specifications that affect performance:

1. Spindle Speed (RPM)

   Higher spindle speeds are essential for machining small, intricate features or soft materials like aluminium, zinc alloys or engineering plastics, balanced speed and torque ensure smooth cuts without tool wear.

2. Table Size and Travel (X/Y/Z Axes)

   The table size determines the largest workpiece the machine can handle. Travel distance affects how many sides or faces can be machined in one setup, which impacts cost and accuracy. For reference, at LVIO, our largest machines handle up to 700x400mm parts. We also use 4th-axis (indexers) for multi-face machining on a single setup.

3. Tool Changer Capacity

   A larger automatic tool changer (ATC) allows for more operations in a single program without manual intervention. This is vital for multi-feature parts or high-mix, low-volume runs.

4. Machine Rigidity and Control Accuracy

   Heavier, stiffer machines reduce vibration and deflection during cutting. Combined with precise control software (e.g. FANUC, Mitsubishi), this ensures tolerances down to ±0.015mm or better.

5. Fixturing and Repeatability

   How well the machine returns to “home” position across multiple parts affects consistency, especially for batch runs. Advanced probing systems help improve this further.

At LVIO Precision, our 3-axis and 4-axis CNC machines are calibrated and maintained to deliver repeatable precision down to 10um—especially on die-cast parts that require tight tolerance finishes, hole features, or flatness correction.

We specialize in low-to-medium volume production where quality and efficiency must align perfectly.

Need advice on the best machining strategy for your next part? Contact us to learn more.