Measure single point and edge dimensions
Since the TM-3000 Series measures outer diameter based on a 2D image, and can provide information on the target inclination. The system can measure outer diameters while correcting for target inclination automatically.
If the target inclines, the scanned diameter becomes larger (The gray curve in the graph on the right), resulting in incorrect measured values.
The inspection area is defined based on a captured image of the target. Calculating the average of the diameters within a given area minimizes the error caused by surface roughness.
When a target with a rough surface was measured, the measured value fluctuated depending on the measurement position, resulting in significant error.
With the TM-3000, it is possible to obtain measured values by just specifying an inspection area around the desired section on the captured image. Unlike conventional micrometers, the measurement can be completed without the troublesome process of changing the target position or preparing a movement mechanism.
With a laser scan system, there were only two methods of obtaining diameter data at narrow intervals. The first required moving either the target or the sensor, resulting in high maintenance cost and motion associated errors. The second required multiple sensors, which resulted in significant increase in initial costs and a more rigorous maintenance schedule.
Setup is as simple as selecting the critical areas on a captured image of the target part. The measurement of the deviation at multiple points can be perfectly synchronized and conducted simultaneously, resulting in significant reduction in cycle time.
Conventionally, the time required to obtain runout information at multiple points was expressed as: Number of measurement points x Rotation time, and also required time to move to the measurement points.
The position correction function allows outer diameter measurement at a fixed distance from a specified feature. Correcting the position displacement or inclination of the target enables reliable evaluation on an actual production line.
Conventional micrometers required the preparation of a special fixture which aligns the target for measurement. Accurate inspection was difficult because the measured value varied due to position variation.
Effects of inclination can be corrected during measurement when calculating from 2D data. Both height difference and outer diameter can be measured with one sampling, allowing inline measurement.
After the reference point was measured, the target was moved to measure the point of interest. The system required a movement mechanism which caused problems such as accuracy issues and higher cost. In addition, accurate measurement was difficult because the resulting value became larger when the target was not perpendicular to the measurement axis.
All measurement is conducted simultaneously using the entire image, and the maximum diameter can be determined from the result. Since the maximum value is derived by inspecting the entire part at once, fixture errors are eliminated.
Conventional micrometers were used to scan the target and then derive the maximum diameter from the scan data. The measurement took more time, or was not accurate due to errors introduced by the fixture.