What Is a Flash Measuring Machine and How Does It Work?

Through the use of sophisticated imaging and measuring technologies, a Flash Measuring Machine is able to take measurements on multiple characteristics of a component using just one picture. This has the effect of making the inspection process much easier for the manufacturers involved.

In today's manufacturing environment, the speed of inspection comes second only to the precision of measurement itself. Standard techniques of measurement may involve positioning, probing, or manual reading of values, which may be required more than once depending on the number of features involved. In this context, the flash measuring machine offers an optimal solution through the use of camera optics.

The flash measuring machine technology becomes invaluable in cases of high-volume inspection and precision measurement, among others.

What Is a Flash Measuring Machine?

A flash gauge is a visual dimensional inspection equipment which aims at the simultaneous measurements of several dimensions in the field of view or with just a few measurement operations.

Rather than touching all dimensions with a probing device, the equipment acquires an image of the piece to be inspected and then processes it for detecting edges, circles, lines, lengths, angles, profiles and any other measurable parameter.

Some key functions may include:

• Quick measurement of several dimensions

• Optical noncontact inspection

• Detection of edges and profiles

• Measurement of holes, slots, radii, angles

• Automatic feature recognition

• Digital measurement data reports

• Reproducible inspection

• Minimal operator participation

The chief benefit here is speed. In case when multiple dimensions must be checked on the same piece, quick inspection through the single image may become much easier.

How Does a Flash Measuring Machine Work?

Steps Involved in Measuring Process

1. Component Placement

The workpiece is placed on the measuring table of the machine. Good placement and fixturing can guarantee reliable results, especially for small components.

2. Image Capturing

The camera takes the image of the component. Adequate lighting makes it possible to have a good contrast between the component and the background.

3. Feature Detection

The vision software analyses the acquired image to detect any features that are measurable including:

• Straight edges

• Circles

• Diameters (internal and external)

• Slotted features

• Radii

• Angles

• Distances

• Contour features

4. Dimensional Analysis

After the detection of the appropriate features, the software will calculate the required dimensions using the selected measuring devices or inspection program.

5. Result Reporting

The calculated dimensions may be compared against the set tolerance values. Based on the particular system setup, the inspection results may be documented.

What Are the Main Benefits of a Flash Measuring Machine?

There are various aspects in which the implementation of flash measuring machines can help boost inspection efficiency.

Faster Measurement

Many features can be measured at once in one image compared to having to measure each feature separately. It becomes especially useful in repetitive production inspections.

Non-Contact Inspection

Inspection using optical methods doesn’t involve the direct contact between the measuring device and the piece being inspected. Such an approach may be useful for the inspection of small or delicate pieces.

Consistent Results

Automated image analysis makes the inspection less dependent on human interpretation. If the inspection procedure has been configured correctly, then subsequent measurements will be performed according to the same protocol.

Lighter Burden on Operators

It is not necessary for operators to measure all dimensions manually. The automatic detection of features and programmed inspection sequences help in lowering the number of repetitive operations.

Improved Inspection Productivity

When it comes to production facilities that need many pieces to be inspected, fast measurements allow increasing inspection productivity without disturbing the general process of measurement.

How Is a Field of View Measuring System Different?

A field of view measuring system is designed around the area that the camera can capture and inspect in a single view.

This approach is particularly useful when a component contains many dimensions that fit within the camera's measurement area.

A field of view system can be advantageous when:

• Several features need to be inspected together

• Inspection speed is a priority

• Components are relatively small

• Non-contact measurement is preferred

• Repetitive dimensional inspection is required

• Consistent automated measurement is needed

The larger and more suitable the field of view is for a particular application, the more features can potentially be evaluated without repositioning the component.

When Should You Consider a CNC Vision Measuring System?

A CNC vision measuring system is generally suited to applications where automated movement and programmed inspection are required.

Unlike a basic optical system that may rely heavily on operator positioning, CNC vision equipment can use motorized axes to move the camera or measurement stage according to a predefined inspection routine.

It can be a strong option when:

1. Components contain features across a larger measurement area.

2. Multiple locations must be inspected automatically.

3. The same inspection sequence is repeated frequently.

4. Operator intervention needs to be minimized.

5. Detailed dimensional inspection is part of production quality control.

The choice between a flash-style measurement approach and a CNC vision measuring system should depend on the component geometry, inspection volume, required accuracy, measurement area, and automation requirements.

What Should You Check Before Choosing a Flash Measuring Machine?

Selecting an optical measurement system should start with the actual inspection requirement rather than machine specifications alone.

Consider these factors:

Measurement Size

Check whether the complete component or the required inspection area fits comfortably within the machine's field of view.

Accuracy and Resolution

Match the system's measurement performance with the tolerances specified on your engineering drawings.

Camera and Optics

Image quality directly affects feature detection. Camera resolution, optics, and illumination should be appropriate for the smallest features being inspected.

Lighting

Different surfaces and geometries may require different illumination arrangements. Good lighting helps produce clear and repeatable feature boundaries.

Software

Look for software that supports the measurements you actually need, including dimensions, circles, angles, profiles, tolerances, and inspection reporting.

Production Requirements

For high-volume applications, measurement speed and automation can have a major effect on overall inspection productivity.

Where Are Flash Measuring Machines Used?

Optical flash measurement technology can be applied across many precision manufacturing environments.

Common applications include:

• Automotive components

• Electronics and electrical parts

• Precision machined components

• Plastic components

• Metal stampings

• Small mechanical parts

• Tooling and fixtures

• Connectors and miniature components

• Industrial components

The best application is one where multiple measurable features can be captured effectively within the system's optical measurement area.

Conclusion

The optical flash measurement machine offers a rapid and non-contact method of dimensional inspection utilizing the technique of optical imaging and measurement software. This can be quite helpful to manufacturing companies who are aiming to enhance their dimensional inspection process, cut down on the repetitive manual measurements and ensure consistent inspection process.

Prior to choosing the optical measurement machine, you need to consider the size of the components, the field of view, accuracy requirements, illumination techniques, software capabilities, and the volume of production.

FAQs

1. What is a flash measuring machine?

It is used for fast non-contact inspection of various dimensional and geometrical characteristics of machined parts.

2. What is the accuracy of a flash measuring machine?

Accuracy is dependent upon the flash machine’s optics, camera, calibration, environment, workpiece geometry and inspection needs.

3. What is a field of view measuring system?

It is an optical measuring system which records an area of interest on a component within a single camera field of view.

4. What is the difference between flash and CNC vision measurement?

Flash measurement focuses on fast measurement of various features within the recorded field of view whereas the CNC vision measuring system can move programmatically to inspect various features in a large area.

5. Can a flash measuring machine be used in production?

Yes. The fast measuring capabilities of a flash measuring machine make it ideal for repetitive and large volume production inspection.