Older CMMs can measure 40% faster using the Renishaw PH20 probe.

Using older 3D CMM measuring machines is a temporary solution to save costs and address measurement and quality control issues in small and medium-sized enterprises with limited capital. Therefore, Renishaw has researched and launched measuring head systems that significantly upgrade and improve measurement capabilities using only PH10 and PH20 measuring heads.

1. Limitations of traditional 3-axis measurement technology

In traditional coordinate measurement, engineers often face a trade-off between speed and accuracy. 3-axis CMMs collect data by moving the entire machine structure (X, Y, Z axes). When attempting to increase measurement speed, the inertial forces arising from the acceleration and deceleration of large machine components cause dynamic errors, significantly reducing system accuracy.

For traditional indexing probes like the PH10 series, point acquisition requires the CMM to perform continuous stop-and-go movements, which not only increases cycle time but also puts mechanical stress on the drive system.

2. The 5-axis technological revolution with the PH20 probe

Unlike 3-axis systems, 5-axis technology (exclusive to Renishaw) allows simultaneous movement of 3 axes of the CMM machine and 2 axes (A, B) of the measuring head. The PH20 measuring head offers significant improvements over older CMM machines through the following mechanisms:

"Head Touches" technique: The PH20 uses the head's own movement to collect measurement points while the CMM machine axes remain stationary or move slowly and smoothly. This eliminates errors caused by structural inertia at high speeds.

Continuous movement: Instead of jerky movements, the machine's movement is smooth and continuous, allowing the measuring head to perform most of the data acquisition tasks.
Stepless indexing: The PH20 allows access to detailed features at any angle without the time-consuming head rotation of the PH10, optimizing access to complex details.

3. Analysis of Technical and Economic Benefits of Upgrading (Retrofit)

Upgrading an old CMM to the PH20 system offers the following practical benefits:

3.1. Significant Productivity Increase

By eliminating head rotation time and minimizing CMM travel distance, the PH20 system significantly increases data acquisition speed compared to traditional 3-axis systems. This allows businesses to address bottlenecks in quality control processes without investing in entirely new equipment.

3.2. Reduced Maintenance and Operating Costs

By shifting the burden of movement from the heavy machine structure to the compact PH20 measuring head, the load placed on the moving parts of the CMM (such as belts and pneumatic bearings) is significantly reduced. Research shows that replacing these consumable components will be less frequent, helping to extend the lifespan of older CMMs.

3.3. Compatibility and Flexibility

The PH20 system operates as a touch-trigger system, compatible with common probe modules such as the TP20. This allows users to reuse their existing probe inventory while still benefiting from 5-axis technology.

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