VMM – Vision Measurement System

A vision measuring machine is a high-precision optical device. It uses high-resolution cameras and computer vision for non-contact measurements of workpieces' dimensions, shapes, and positions. It combines optical, mechanical, electrical, and computer technologies. It's non-contact, efficient, and precise. So, it is widely used in machinery, electronics, medical devices, and aerospace.

The measurement accuracy of vision measuring machines can reach the micron level, depending on the model and configuration: 

• Standard VMM: Resolution is 0.001mm, with measurement accuracy around (3+L/200)μm (L refers to the stage movement).
• High-Precision VMM: Accuracy can reach 1.8μm, with X/Y-axis precision of ±(1.8+L/200)μm and Z-axis precision of ±(3.5+L/200)μm.
• Fully Automated VMM: Some models achieve ultra-high accuracy of ±0.1μm.
• Special Models: Measurement repeatability is ±1μm, with stitching accuracy of ±(2+0.02L)μm. 

In summary, the accuracy of VMMs ranges from ±0.1μm to (3+L/200)μm, depending on the specific model.

When selecting the appropriate vision measuring machine, consider the following factors:

• The size and complexity of the parts you intend to measure.
• The required measurement accuracy.
• The specific types of measurements you need to perform.

To choose a machine, follow these steps:

1. Determine the size you need to measure and the measurement accuracy you need.
2. Determine the size of the part to ensure that the VMM you choose has a large enough field of view. Specify the size of the smallest feature you want to measure and we will recommend the most suitable configuration for you. Contact us now!
3. Choose 2D or 3D measurement software. Compare the sample test report obtained from the demo with the standard report to check accuracy.
4. Select a machine capable of performing a wide range of measurements and offering options for upgrades and expansion.
5. Ensure that the VMM fits within your budget while offering the essential features and accuracy you require.
6. Identify a dependable VMM manufacturer, like MXP, and compare the features, specifications, and pricing of various models.

VMM measurement data is manageable and traceable:

• Data management software: Dedicated software can efficiently store, retrieve and manage measurement data. Our VMM supports complex data analysis and sharing, which is easy to integrate into the enterprise quality management system.
• Automated measurement procedures: Our VMM has automation options to improve measurement efficiency and consistency.
• Statistical analysis and report generation: The software provides advanced statistical analysis and customized report generation, including charts and analysis results, to support quality control and data communication.
• Data traceability: All measurements are recorded and tracked.
• Software updates and technical support: Regular software updates. We also provide professional technical support and training.
• Calibration and maintenance: Regular calibration and routine maintenance using standard tools.

• Annual calibration: For many standard applications, annual calibration may be sufficient.
• Semi-annual calibration: For applications that require higher accuracy or are used more frequently, calibration may be required every six months.
• Quarterly or more frequent calibration: For critical applications that require high accuracy or continuous operation, calibration may be required quarterly or more frequently.

The difficulty of repairing a VMM depends on the complexity of the equipment, the skills of the operator, and the completeness of the repair procedures:

• Equipment complexity: High-precision optics, mechanical structure, and advanced software increase technical requirements.
• Operator skills: Professional training can greatly reduce the difficulty of repair.
• Maintenance procedures: Detailed guidelines and regular training can improve maintenance efficiency.

Common maintenance requirements:

• Cleaning: Clean lenses, work surfaces and other exposed components regularly.
• Environmental control: Ensure proper temperature, humidity and dust-free conditions.
• Inspection and calibration: Inspect components regularly and calibrate as recommended.
• Software updates: Keep software up to date.

In simple terms, VMM is used for high-precision, non-contact measurement of many small parts or delicate parts, while CMM is used for larger parts, 3D inspection, or flexible, portable measurement.

The specific differences are reflected in the measurement principle, application field, and operation method:

Measurement principle

VMM uses optical elements such as a light source and imaging unit to perform non-contact measurements through optical imaging.

CMM uses a probe to capture coordinates and calculate dimensions and GD&T features, which is very suitable for large or heavy parts in portable models.

Application field

VMM is best suited for small or delicate parts due to its small measurement table (usually under 12x12 inches).

CMM is suitable for large parts or 3D measurements, and portable models have no table size restrictions.

Operation

VMM can quickly measure multiple parts at the same time, such as measuring up to 1000 parts with thousands of dimensions in a few seconds.

CMM performs detailed 3D measurements and generates data reports to ensure quality standards.

Accuracy and speed

VMM has higher accuracy but a smaller measurement area (less than 1 foot). Faster and can measure hundreds of parts simultaneously.

CMMs are less accurate but can accommodate larger parts (up to 6 feet) and measure one part at a time.

VMM are high-precision, multi-functional tools widely used in the following areas: 

Dimensional and Shape Measurement: Accurately measure dimensions, contours, and positions to ensure design and assembly precision.

Batch Inspection and Quality Control: Efficiently measure large volumes of parts, reduce defects, and enhance product quality.

Data Analysis and Optimization: Provide precise data for optimizing product design and production decisions. 

Non-Contact and Complex Inspection: Suitable for measuring precision components and non-contact workpieces. 

Automation and Cross-Industry Applications: Enhance efficiency through automated measurements, serving industries such as electronics, automotive, and aerospace. VMMs play a vital role in improving efficiency, ensuring quality, and optimizing designs.

Yes, we offer free, comprehensive online training that includes detailed machine operating instructions, installation guides, maintenance guides, uninstallation guides, and training materials. MXP also offers offline training (for a fee) at our facilities or at your location that covers basic machine operation and maintenance.