Difference between revisions of "End-Scan Using the End Wall"

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How to perform the end-wall end scan.<br><br>
 
How to perform the end-wall end scan.<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 End Wall Technique===
  
 
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This end-scan method is useful for increase in precision over the scissor method.
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We recommend this for increased precision where it is possible to strike the end wall. The End Wall method is also very useful for thicker wall tubes.
 
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We recommend this for increased precision where high-reflectivity and burrs are not an issue on the end wall of the tube.  The End Wall method is also very useful for thicker wall tubes.
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The advantage of this method is that it is less prone to outlier points.  The disadvantage is that it is hard to aim at thinner walls.<br><br>
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<br><br>
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For tube walls with high-reflectivity with burrs or saw marks, we recommend either a coating (see below) or the most precise [[End-Scan Using End Targets]].
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For tube walls with high-reflectivity and burrs, we recommend the most precise [[End-Scan Using End Targets]].
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===Measure Setup===
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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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* Set Measure Setup - LASER Tab: Cylinder stripes = 3 to 5
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* Set Measure Setup - LASER Tab: End-scan stripes = 5
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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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* Align the scanner at the end wall of the tube.
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* Align the scanner so that it touches one end wall of the tube.<br><br>
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** If you are looking directly at the end of the tube, be careful to not allow the laser reflection to strike you in the eyes.<br><br>
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* Attempt to hold the laser motionless when collecting the stripes to increase repeatability.<br><br>
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* For repeatability, attempt to hold the probe motionless during scanning.
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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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** Holding the probe motionless during scanning is important.  If you move the probe during scanning the end, then repeatability will drop significantly because of exposure changes where the laser falls off the end of the tube.
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* Press the green button until VTube-LASER is finished scanning all the end stripes.<br><br>
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** Likewise, striking the same end location is important during each repeat measure.<br><br>
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* If you are scanning an end that is highly reflective, then coat the end with powder or white paint marker (See Avoiding Outliers below).<br><br>
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*Press the green button until VTube-LASER is finished scanning all the end stripes.<br><br>
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* After you perform this scan, you should be able to observe a straight line of points on the screen that represent the end wall. If you don't see this line, then repeat the end scan measurement by using the "Previous" button in the measurement control window.
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The advantage of this method is that it is easy to use. The disadvantage is that it is more prone to outlier points from the inner diameter surface.
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[[image:EndWithEndWall1.jpg|300px]]
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[[image:endwall_whitepaint_scan_llp.jpg|300px]]<br><br>
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[[image:endwall_whitepaint_scan.jpg|300px]]
 
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===Another Way to Use This End-Scan Technique===
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===Avoiding Outliers===
  
  
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* Align the scanner so that it touches one end wall of the tube.<br><br>
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When scanning the end walls of highly reflective tubing with striations like shown in the image on the right, it is better to either cover the end with a coat of Maganaflux, Dynaflux, foot powder spray, white marking paint pen, or cover it with an end target to avoid outlier points.<br><br>
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*Press the green button until VTube-LASER is finished scanning all the end stripes.<br><br>
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The image below shows an end target plastic label attached to the end of the same tube.  In this case, there are no striations visible.<br><br>
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[[image:EndWithEndWall_HighReflective_Striation_EndTarget.jpg|200px]]
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The advantage of this method is that it is less prone to outlier points. The disadvantage is that it is hard to aim at thinner walls.
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<br><br>
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See also [[Surface Paint]] for using a white paint marker for the prep of the end scan.
 
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[[image:EndWithEndWall2.jpg|300px]]
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[[image:EndWithEndWall_HighReflective_Striation.jpg|300px]]
 
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* See also [[End-Scan Using End Targets]]
 
* See also [[End-Scan Using End Targets]]
 
* Back to [[VTube-LASER]]
 
* Back to [[VTube-LASER]]
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* See also [[Surface Paint]]

Latest revision as of 05:43, 31 January 2017

Vtube-laser logo.jpg How to perform the end-wall end scan.

Vtube-laser 1 73.jpg

Contents


About the End Wall Technique

We recommend this for increased precision where it is possible to strike the end wall. The End Wall method is also very useful for thicker wall tubes.

The advantage of this method is that it is less prone to outlier points. The disadvantage is that it is hard to aim at thinner walls.

For tube walls with high-reflectivity with burrs or saw marks, we recommend either a coating (see below) or the most precise End-Scan Using End Targets.

How To Use This End-Scan Technique

  • Align the scanner so that it touches one end wall of the tube.

  • Attempt to hold the laser motionless when collecting the stripes 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.

  • If you are scanning an end that is highly reflective, then coat the end with powder or white paint marker (See Avoiding Outliers below).

  • After you perform this scan, you should be able to observe a straight line of points on the screen that represent the end wall. If you don't see this line, then repeat the end scan measurement by using the "Previous" button in the measurement control window.

Endwall whitepaint scan llp.jpg

Endwall whitepaint scan.jpg

Avoiding Outliers

When scanning the end walls of highly reflective tubing with striations like shown in the image on the right, it is better to either cover the end with a coat of Maganaflux, Dynaflux, foot powder spray, white marking paint pen, or cover it with an end target to avoid outlier points.

The image below shows an end target plastic label attached to the end of the same tube. In this case, there are no striations visible.

EndWithEndWall HighReflective Striation EndTarget.jpg

See also Surface Paint for using a white paint marker for the prep of the end scan.

EndWithEndWall HighReflective Striation.jpg

Other Pages

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