Difference between revisions of "End-Scan Using the Scissor Motion"

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How to perform quick scissor motion end-scans.<br><br>
 
How to perform quick scissor motion end-scans.<br><br>
 
* Back to [[VTube-LASER]]
 
* Back to [[VTube-LASER]]
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* See [[End-Scan Technique Research]]
 
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===Why the End-Scan technique is important===
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===About the Scissor Orientation - Easy But Least Precise===
  
 
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This end-scan method is useful for ease-of-use.  Its weakness is that it is the least precise of the three techniques that we recommend.
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This end-scan method is useful for ease-of-use and quickness, however it is the least precise of the techniques.
 
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We also recommend the [[End-Scan Using the End Wall]] technique and the most precise [[End-Scan Using End Targets]].
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You can expect about 0.1 inches (2.5mm) of repeatability in end lengths when using this method for end scans.
 
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For tubes that don't qualify for either of the above techniques, we recommend end targets for ultra-precise measurements.
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We also recommend these techniques:
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===Apply the Target===
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* [[End-Scan Using the End Wall]]
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* [[End-Scan Using End Targets]] (most precise)
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* The image at the right shows the end of a copper tube with a sharp burr and a highly reflective end-wall.  It is very difficult to aim the laser at this end wall and ensure no outliers at the same time.<br><br>
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*The solution is to use white targets on the end of the tubes.  The example here shows white poly labels that measure at 0.004" thick and provide an excellent flat target for the laser.<br><br>(Note: Use the Plane-Point measurement in the built-in computer of the FARO Edge to confirm the thickness of the target.)<br><br>
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* The offset from the target to the tube end is entered as a negative value in the Part Setup menu for either end.  In this case, we use -0.004" offset.<br><br>
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*Any shape of target works well as long as it is LARGER than the diameter of the tube.  Apply the target so that none of the end-wall can be scanned by the laser.
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[[image:EndWithTarget.jpg|300px]]<br>
 
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[[image:EndWithTarget2.jpg|300px]]
 
 
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===Measure the Target===
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===Measure Setup===
 
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When it is time to perform and end-scan, use the following technique to scan the target:
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* Set System Options, Measure 2 Tab, "Maximum Number of LLP Points in String" to 3
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* Set Measure Setup - LASER Tab: The LASER defaults to ON for CYLINDERS and END-SCANS.
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* Aim the laser at the target so that it strikes the target as perpendicular to the surface as possible. Avoid returning any points other than the target.<br><br>
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* Set Measure Setup - LASER Tab: Cylinder stripes = 3 to 5
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* Hold the laser still when collecting the stripes across the target.
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* Set Measure Setup - LASER Tab: End-scan stripes = 5
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* Consistently place the line across the same area of the target from measure to measure.
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* Set Measure Setup - LASER Tab: Split bend stripes = 5
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* Set Measure Setup = Scan Rates Tab: Set all rates to TIMER for all scan types.
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* Set Measure Setup = Scan Rates Tab: Set the Scan Rates TIMER is set to 0 for all TIMERS.
 
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[[image:EndWithTargetAndLaser.jpg|300px]]<br>
 
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[[image:EndWithTargetAndLaserCloseup.jpg|300px]]<br>
 
 
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===Approve the Measurement On the Screen===
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===How To Use This End-Scan Technique===
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* The resulting geometry on the screen should appear like the image at he right.<br><br>
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* The end point generated on the screen should perfectly coincide with the stripes.<br><br>
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[[image:EndScanAfterTarget.jpg|300px]]
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===Using End Target Adapters===
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* Align the scanner with a slight scissor angle across the end as is shown in the image on the right<br><br>
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* If you prefer using more durable end target adapter that plugs into the end of the tube, then they can be manufactured for repeatable measurements.<br><br>
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* Attempt to hold the laser motionless when collecting the stripes across the end to increase repeatability.<br><br>
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* The end target surface should be painted or covered with a flat white or near-white target.<br><br>
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* Consistently place the line across the same area of the tube end from measure to measure.<br><br>
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* The offset from the target to the tube end is entered as a negative value in the Part Setup menu for either end.
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*Press the green button until VTube-LASER is finished scanning all the end stripes.<br><br>
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[[image:EndWithScissorCloseup.jpg|300px]]<br><br>
 
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[[image:EndTargetPlugDesign.jpg|300px]]
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[[image:EndWithScissor.jpg|300px]]
 
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===Other Pages===
  
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* See also [[End-Scan Using the End Wall]]
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* See also [[End-Scan Using End Targets]]
 
* Back to [[VTube-LASER]]
 
* Back to [[VTube-LASER]]

Latest revision as of 15:20, 1 December 2016

Vtube-laser logo.jpg How to perform quick scissor motion end-scans.

Vtube-laser 1 73.jpg


About the Scissor Orientation - Easy But Least Precise

This end-scan method is useful for ease-of-use and quickness, however it is the least precise of the techniques.

You can expect about 0.1 inches (2.5mm) of repeatability in end lengths when using this method for end scans.

We also recommend these techniques:

Measure Setup

  • Set System Options, Measure 2 Tab, "Maximum Number of LLP Points in String" to 3
  • Set Measure Setup - LASER Tab: The LASER defaults to ON for CYLINDERS and END-SCANS.
  • Set Measure Setup - LASER Tab: Cylinder stripes = 3 to 5
  • Set Measure Setup - LASER Tab: End-scan stripes = 5
  • Set Measure Setup - LASER Tab: Split bend stripes = 5
  • Set Measure Setup = Scan Rates Tab: Set all rates to TIMER for all scan types.
  • Set Measure Setup = Scan Rates Tab: Set the Scan Rates TIMER is set to 0 for all TIMERS.

How To Use This End-Scan Technique

  • Align the scanner with a slight scissor angle across the end as is shown in the image on the right

  • Attempt to hold the laser motionless when collecting the stripes across the end to increase repeatability.

  • Consistently place the line across the same area of the tube end from measure to measure.

  • Press the green button until VTube-LASER is finished scanning all the end stripes.

EndWithScissorCloseup.jpg

EndWithScissor.jpg

Other Pages

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