Workpiece centering refers to accurately locating the zero point of a machining part. Incorrect centering can lead to machining errors or even scrap parts, making precise centering an essential skill for every CNC operator. Currently, the most common centering tools include dial indicators (micrometers), edge finders, and machine tool probes. Today, we’ll provide a detailed breakdown of these centering methods.
1. Centering with Dial Indicators (Micrometers)
This method relies entirely on manual operation, requiring high operator skill and consuming significant time. It is also prone to human error, which is why it’s gradually being phased out. Currently, it’s mainly used by small workshops or factories where extreme precision isn’t critical.
2. Centering with Edge Finders
Edge finders must rotate during operation, requiring visual judgment to determine contact with the workpiece. Since human eyesight varies and is susceptible to fatigue, this method offers limited accuracy. It’s suitable only for less critical workpieces and cannot measure holes smaller than 10mm in diameter.
3. Centering with Machine Tool Probes
Once installed, the probe touches each side of the workpiece (either manually or via program control), records the machine coordinates, and automatically calculates the center point. This ensures high centering accuracy and improves overall machining precision.
Probing eliminates reliance on operator skill, transforming what was once an experience-dependent, “feel-based” process into a scientific, simple, and universally repeatable method. As a result, machine tool probes are becoming the industry standard in CNC machining.
COMP Series Machine Tool Probe
- Repeatability accuracy: Up to 1μm
- Minimum measurable hole diameter: 2mm
- Interchangeable stylus: Probe tips can be customized (ball size, length, etc.) for enhanced versatility
With its superior precision and adaptability, the COMP Series Probe delivers unmatched performance in modern CNC operations.
Key Takeaways:
- Traditional methods (dial indicators/edge finders) → Prone to error, skill-dependent
- Machine probing → Automated, precise, operator-independent
- COMP Series → High repeatability (1μm), configurable for diverse applications
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