Measurement Terms

CNC - Computer Numerical Control

What is "CNC” Computer Numerical Control?

CNC CMMs, like CNC machine tools, move automatically rather than relying on manual operation.

Computer Numerical Control (CNC) enhances a Coordinate Measuring Machine (CMM) by automating precise measurements. Precision positioning allows the probe to move accurately along the X, Y, and Z axes, ensuring tight tolerances and minimal deviation. Closed-loop feedback continuously monitors and adjusts the probe’s position in real time using axis scales and encoders, keeping it on the correct path. These features enable Mitutoyo CMMs to deliver highly accurate and repeatable measurements, making them essential for quality control in manufacturing.

Figure 1

Advantages of CNC Type Machines

• Consistent & Repeatable Results: Measurement and test results remain uniform across multiple operations.
• Minimized Operator Error: Automation reduces variability caused by individual differences, enhancing repeatability.
• Collision Safety: Built-in safety features help prevent damage from operational errors.
• Versatile Measurement: Supports a wide range of inspections by simply switching measurement procedures (Figure 2).
• Seamless Automation: Easily integrates with transport equipment and other automated systems for streamlined operation.

Figure 2

Key Considerations for CNC CMMs

• Limited Advantage for Infrequent Use: CNC automation is most beneficial for high-volume measurements; occasional tests may not justify the investment.
• Expertise Required: Developing advanced measurement procedures requires significant system knowledge and experience.
• Risk of Over-Reliance on Automation: Heavy reliance on automated procedures may make it harder to detect setup errors.
• Fixture Requirements: Dedicated fixing jigs may be necessary to ensure accurate and efficient measurements for different objects.

Supplementary Information: Non-CNC Models Are Still Compatible

• Automation Capabilities: Even if a machine does not have "CNC" in its name, it may still support automatic measurement functions, reducing personal error through optional units and multi-location automation.
• Support for Measurement Procedure Creation: Various built-in features simplify the process:
  • Save a series of manual actions as a measurement procedure.
  • Use CAD data to define measurement positions and actions.
  • Leverage specialized software to automatically generate procedures from 3D CAD models (Figure 3).
• Choosing the Right Model: Select a machine that best fits your specific measurement or testing needs

Figure 3

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Related Solutions and Applications

CRYSTA-Apex V - General-Purpose CNC Coordinate Measuring Machine

The CRYSTA-Apex V is a standard accuracy, high-speed CNC coordinate measuring machine designed for versatile dimensional and geometric tolerance measurements, offering improved productivity and enhanced visualization within a single unit.

QV Apex Pro Series - CNC Vision Measuring Machine

The QV APEX Pro CNC Vision Measuring Systems feature the advanced StrobeSnap function and synchronized camera-strobe light operation, enabling high-speed, non-stop measurements with up to 45% reduced measurement time compared to previous models.  

HR-600 Series - High-End CNC Rockwell Hardness Testing Machine

The HR-600 is a versatile hardness testing machine that accommodates large workpieces up to 220 lbs without modification and supports multiple testing methods, including Rockwell, Brinell, and Plastics.