Difference between revisions of "Scanning on a NEWPORT type table"
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(→Potential For Phantom Outliers At Normal (Perpendicular) Reflective Surfaces) |
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− | == NEWPORT | + | == What is a NEWPORT Table?== |
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+ | The Newport table is a an optical table designed to hold laser lens and mirrors. Some customers use them as similar to a granite surface used to measure tube shapes.<br><br> | ||
Scanning on NEWPORT tables is possible with the FARO scanner system, but care must be taken because of the high reflectivity of the surfaces in the drilled and tapped holes.</td> | Scanning on NEWPORT tables is possible with the FARO scanner system, but care must be taken because of the high reflectivity of the surfaces in the drilled and tapped holes.</td> | ||
<td> | <td> | ||
− | [[image:newport_table.png| | + | [[image:newport_table.png|600px]] |
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− | == | + | == Scanning Example== |
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− | + | The image on right shows an example of scanning a tube on a Newport table.<br><br> | |
− | + | ||
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− | [[image: | + | [[image:scanning_on_newport.png|600px]] |
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+ | == Potential For Phantom Outliers At Normal (Perpendicular) Reflective Surfaces== | ||
− | == | + | <table> |
+ | |||
+ | <tr valign=top> | ||
+ | <td width=300> | ||
+ | View the angle of the scanner in the image in the preceding section.<br><br> | ||
+ | Now see this closeup in this image. The chamfer in the hole being called out is perpendicular to the incoming laser beam.<br><br> | ||
+ | This can cause slight outliers to the laser camera that can cause the cylinder calculation to fail if the cut plane offset is not set large enough.</td> | ||
+ | <td> | ||
+ | [[image:closeup_newport_outliers_note.png|600px]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | |||
+ | <tr valign=top> | ||
+ | <td width=300> | ||
+ | This is the image of the real-time scanned points in the FARO Laser Line Probe scanner setup screen.<br><br> | ||
+ | Notice that the chamfer that is normal to the laser and the camera is creating a bubble outlier. The effect is that the camera sees points where there is no object in space. The reason is because of the intensity of the reflection caused by the chamfer. It is overexposing the laser scanner camera in this area.<br><br> | ||
+ | One way to overcome this bubble is to increase the cut plane offset. In this case, the offset was set to 1 inch- which puts the outliers below the cut plane. You can safely set the office up to 1/2 the diameter.<br><br> | ||
+ | Another way to overcome this issue is to place a darker surface (a mat or paint) on the table. | ||
+ | [[image:vtube-laser_closeup_outliers.png|400px]]</td> | ||
+ | <td> | ||
+ | [[image:Faro_LLP_Control_Newport_Table.png|800px]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | |||
+ | </table> | ||
+ | <br> | ||
+ | |||
+ | See also [[How to Diagnose Inaccurate VTube-LASER Measurements]] | ||
+ | |||
+ | == The Impact on Cylinder Calculations== | ||
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− | + | If VTube includes these outliers with the OD stripes to calculate the diameter, then often the cylinder fit math will fail to find a centerline - and VTube will ask you to remeasure the straight where the problem is occuring.</td> | |
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<td> | <td> | ||
− | + | [[image:vtube-laser_cylinderfit_error_window.png|500px]] | |
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− | [[image:vtube- | + | |
</td> | </td> | ||
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Latest revision as of 16:32, 1 December 2016
|
What is a NEWPORT Table?
The Newport table is a an optical table designed to hold laser lens and mirrors. Some customers use them as similar to a granite surface used to measure tube shapes. |
|
Scanning Example
The image on right shows an example of scanning a tube on a Newport table. | |
Potential For Phantom Outliers At Normal (Perpendicular) Reflective Surfaces
See also How to Diagnose Inaccurate VTube-LASER Measurements
The Impact on Cylinder Calculations
If VTube includes these outliers with the OD stripes to calculate the diameter, then often the cylinder fit math will fail to find a centerline - and VTube will ask you to remeasure the straight where the problem is occuring. | |
Other Pages
- Back to the VTube-STEP page
- Back to the VTube-LASER page