5 Questions with Tim Moriarty

Advertorial - Ask the Experts

A senior vice president of Quality Vision International (QVI) discusses how the c-vision measurement system improves motor vehicle inspection.

February 4, 2019

1) How does QVI’s c-vision measurement system straddle the difference between contour projectors and video-based metrology systems?

Our c-vision system is our most popular contour projector with our new large field of view (FOV), highly telecentric, large depth-of-focus optics that have become very popular on video measurement machines (VMMs).

These optics provide a similar field of view that people are familiar with on contour projectors – a 30" projector screen at 10x magnification would give you a 3" FOV – on a computer monitor, which until recently was unheard of on video machines. New optics with high-sensitivity cameras allow c-vision to produce great images of parts.

2) How does higher resolution benefit typical motor vehicle inspection tasks, such as measuring a crankshaft?

Depending on the throw of the crankshaft, you could see all the journals at once instead of having to refocus the system, so measurement times improve.

Also, with surface illumination challenges of standard contour projectors, you would have a tough time seeing the oil journals or the holes in the shaft. With c-vision’s LED lighting and camera sensitivity, those features are very clear to see.

One demo I use when I show these machines, I take a black rubber connector that on a standard contour projector would look like a flat, out-of-focus disc. I hold the part at the focal point and just flip it around. You can see down in the holes. Everything is in focus because its large depth of focus and size doesn’t change because of its telecentricity.

3) How can companies use the c-vision to support Industry 4.0, data-driven manufacturing?

The system software gives you a full range of capabilities.

You can simply use targets, such as a crosshair target or radius chart, on the video screen and use it like a standard comparator – line up one edge, punch the zero button, move to another edge, and read the size.

Or, you can bring in the CAD model and create an entire overlay of a part. Once you establish a few points, the chart follows the magnified image around, so you don’t have to keep repositioning overlays.

The next level is full automation. We can do full feature extraction, edge measurement, and surface edge measurements.

We can write routines that automatically do all measurements, send the output to statistics, do fitting analyses for geometric tolerances, and send reports to a database.

So, it’s adaptable to the people who need simple Go/No-Go measurements all the way to Industry 4.0 and digital factory.

4) Is part measurement on a c-vision significantly faster than other comparators?

Typical comparators are built for carrying very heavy loads, so their stages can’t move very quickly. The speed advantage comes more on the quality side.

With the large FOV, a user can do all types of measurements within an image very quickly versus having to bring everything to the center of the screen, one-at-a-time, for multiple measurements.

More importantly, there’s no tradeoff in speed to get much higher precision.

5) What has the customer response been to the latest c-vision systems?

Half of the machine sales are duplicate orders. Once customers see how c-vision works for their applications, they’re very happy with them, so they order more.