Difference between revisions of "FARO Scanner Settings for VTube-LASER"
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− | + | [[image:VTL Computer with Full FARO EDGE.png|300px|right]] | |
− | [[image: | + | |
This is a guide for FARO scanner setup with VTube-LASER. | This is a guide for FARO scanner setup with VTube-LASER. | ||
==Results from Extensive Research== | ==Results from Extensive Research== | ||
− | VTube-LASER has sophisticated analysis tools (like | + | |
− | + | <table> | |
− | < | + | <tr> |
− | < | + | <td width=300> |
+ | VTube-LASER has sophisticated analysis tools (like [[DCF - Dual Cylinder Fit]]) that can tell operators if the incoming data is reasonably good. Because of these built-in tools, we have discovered some useful operating principles for best practices in FARO scanner setup.<br><br> | ||
+ | The principles here probably apply to other shapes as well - but we know for sure that they apply to measuring at least cylindrical shaped surfaces. | ||
+ | </td> | ||
+ | <td> | ||
+ | [[image:vtube-laser_v2.8_DCF_logo.png|300px]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
==PRINCIPLE 1: LLP Camera Exposure Modes Depend on the FARO Scanner Version== | ==PRINCIPLE 1: LLP Camera Exposure Modes Depend on the FARO Scanner Version== | ||
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<tr> | <tr> | ||
<td width=300> | <td width=300> | ||
− | The diagram on the right shows the workable exposure settings that are acceptable with the FARO scanners when measuring tube shape. | + | The diagram on the right shows the workable exposure settings that are acceptable with the different versions of FARO scanners when measuring tube shape. |
<br><br> | <br><br> | ||
In some cases the older version scanners can use AUTOMATIC modes, but the cylinder calculation is not as reliable in these modes.<br><br> | In some cases the older version scanners can use AUTOMATIC modes, but the cylinder calculation is not as reliable in these modes.<br><br> | ||
− | For version 2 and version 3 scanners, it is almost impossible to pass the 4-level cylinder fit-test in VTube-LASER 2.8 | + | For version 2 and version 3 scanners, it is almost impossible to pass the 4-level cylinder fit-test in VTube-LASER 2.8 or newer when scanning tubes. The only solution, in this case, is to use FIXED mode in the FARO Laser Line Probe Control window.<br><br> |
</td> | </td> | ||
<td> | <td> | ||
− | [[image:FARO Scanner Settings Illustration.png| | + | [[image:FARO Scanner Settings Illustration.png|450px]] |
</td> | </td> | ||
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<br><br> | <br><br> | ||
− | ==PRINCIPLE 2: FIXED Exposure Mode is better than AUTOMATIC Exposure Mode== | + | ==PRINCIPLE 2: FIXED Exposure Mode is better than AUTOMATIC Exposure Mode for Reliability== |
<table> | <table> | ||
<tr> | <tr> | ||
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An important principle that we've discovered is that FIXED exposure mode is more reliable than AUTOMATIC exposure mode in returning consistently accurate surface points when measuring a cylinder.<br><br> | An important principle that we've discovered is that FIXED exposure mode is more reliable than AUTOMATIC exposure mode in returning consistently accurate surface points when measuring a cylinder.<br><br> | ||
− | + | The difference in reliability between FIXED and AUTOMATIC exposure modes depends on the scanner version. With version 6 (the HD blue line scanner), the difference is usually minimal. With older versions, the difference can be more of an issue. '''Whether or not the difference matters is easily detected and reported by VTube-LASER's [[DCF - Dual Cylinder Fit]] feature.'''<br><br> | |
+ | |||
+ | Also, a Cut Plane surface may interfere with the automatic exposure mode if the Cut Plane reflectivity is much different than the tube surface reflectivity. Changing to FIXED exposure mode solves this issue.<br><br> | ||
</td> | </td> | ||
<td> | <td> | ||
− | [[image:vtube-laser_cylinder on cut plane.png| | + | [[image:vtube-laser_cylinder on cut plane.png|450px]] |
</td> | </td> | ||
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<br><br> | <br><br> | ||
− | ==How to Setup FIXED Exposure Mode== | + | ===How to Setup FIXED Exposure Mode for Any Tube Surface=== |
<table> | <table> | ||
<tr> | <tr> | ||
<td width=300> | <td width=300> | ||
− | |||
− | |||
− | |||
To setup FIXED mode for a new tube surface, enter the FARO Laser Line Probe control by pressing VTube-LASER's Scanner Control button at the top of the viewport, then follow these steps:<br><br> | To setup FIXED mode for a new tube surface, enter the FARO Laser Line Probe control by pressing VTube-LASER's Scanner Control button at the top of the viewport, then follow these steps:<br><br> | ||
# Set the algorithm to "FIXED".<br><br> | # Set the algorithm to "FIXED".<br><br> | ||
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<br><br> | <br><br> | ||
+ | ===Two Minor Limitations to FIXED Exposure Mode=== | ||
+ | <table> | ||
+ | <tr> | ||
+ | <td width=300> | ||
+ | ====Limtation One==== | ||
+ | The user needs to take the minute to setup the exposure setting for the current material type that is being scanned. (In our experience, no customer has objected to this extra minute of scanner setup time.)<br><br> | ||
+ | ====Limitation Two==== | ||
+ | FIXED mode may not handle parts well that change surface types in the middle of the part. (This is a rare situation in tube fabrication.) | ||
+ | </td> | ||
+ | <td> | ||
+ | </td> | ||
+ | |||
+ | </tr> | ||
+ | </table> | ||
+ | <br><br> | ||
− | ==Scan Density of 1/16 is Best== | + | ==PRNCIPLE 3: Scan Density of 1/16 is Best== |
<table> | <table> | ||
<tr> | <tr> | ||
<td width=300> | <td width=300> | ||
− | Scan Density is set in fractional values. "1/1" means all the points are being | + | Scan Density is set in fractional values. "1/1" means all the points are being transfered to VTube-LASER. "1/16" means a 16th of the total points are being transfered to VTube-LASER.<br><br> |
For measuring tube shapes, a Scan Density of 1/16 is more than enough.<br><br> | For measuring tube shapes, a Scan Density of 1/16 is more than enough.<br><br> | ||
− | Not only is 1/16 enough density, reduces the | + | Not only is 1/16 enough density for scanning, it also reduces the time required for VTube-LASER's math engine to calculate cylinder centerlines. |
</td> | </td> |
Latest revision as of 21:59, 16 June 2017
This is a guide for FARO scanner setup with VTube-LASER.
Contents |
Results from Extensive Research
VTube-LASER has sophisticated analysis tools (like DCF - Dual Cylinder Fit) that can tell operators if the incoming data is reasonably good. Because of these built-in tools, we have discovered some useful operating principles for best practices in FARO scanner setup. |
PRINCIPLE 1: LLP Camera Exposure Modes Depend on the FARO Scanner Version
The diagram on the right shows the workable exposure settings that are acceptable with the different versions of FARO scanners when measuring tube shape.
For version 2 and version 3 scanners, it is almost impossible to pass the 4-level cylinder fit-test in VTube-LASER 2.8 or newer when scanning tubes. The only solution, in this case, is to use FIXED mode in the FARO Laser Line Probe Control window. |
PRINCIPLE 2: FIXED Exposure Mode is better than AUTOMATIC Exposure Mode for Reliability
An important principle that we've discovered is that FIXED exposure mode is more reliable than AUTOMATIC exposure mode in returning consistently accurate surface points when measuring a cylinder. The difference in reliability between FIXED and AUTOMATIC exposure modes depends on the scanner version. With version 6 (the HD blue line scanner), the difference is usually minimal. With older versions, the difference can be more of an issue. Whether or not the difference matters is easily detected and reported by VTube-LASER's DCF - Dual Cylinder Fit feature. Also, a Cut Plane surface may interfere with the automatic exposure mode if the Cut Plane reflectivity is much different than the tube surface reflectivity. Changing to FIXED exposure mode solves this issue. |
How to Setup FIXED Exposure Mode for Any Tube Surface
To setup FIXED mode for a new tube surface, enter the FARO Laser Line Probe control by pressing VTube-LASER's Scanner Control button at the top of the viewport, then follow these steps:
When the AUTO button re-enables, then the setup is finished. You can press OK to exit this menu and use these new settings. These values will be stored in the VTube-LASER project file for reuse with this project later. |
Two Minor Limitations to FIXED Exposure Mode
Limtation OneThe user needs to take the minute to setup the exposure setting for the current material type that is being scanned. (In our experience, no customer has objected to this extra minute of scanner setup time.) Limitation TwoFIXED mode may not handle parts well that change surface types in the middle of the part. (This is a rare situation in tube fabrication.) |
PRNCIPLE 3: Scan Density of 1/16 is Best
Scan Density is set in fractional values. "1/1" means all the points are being transfered to VTube-LASER. "1/16" means a 16th of the total points are being transfered to VTube-LASER. For measuring tube shapes, a Scan Density of 1/16 is more than enough. Not only is 1/16 enough density for scanning, it also reduces the time required for VTube-LASER's math engine to calculate cylinder centerlines. |
Other Pages
- See VTube-LASER
- See FARO Version 6 Scanner
- See Surface Spray