Difference between revisions of "How To Import Channel-Shaped Parts"

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(→‎Offset the Legs of the Path to Get the Correct Bender Data Lengths)
 
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== What is a Channel-Shaped Part==
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== What is a Channel-Shaped Part?==
  
 
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== Reversed Point Labels==
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== How To Find The Bend Data==
  
 
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When you reverse the XYZ rows, VTube will also reverse the point labels.<br><br>With the point labels reversed, it is a good idea to look at the END LABELS rather than the POINT LABELS to determine which end to measure first.<br><br>
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Find the bend data for this kind of part by treating the path of one of corner radii as if it were a tube shape. If you zoom in on this part's edge, you will find two radii.  Choose one of them using the standard collection process for tube shapes.</td>
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See the effect in the image on the right.  The END A label is at point 9 in this part after a reverse of the XYZ data.</td>
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[[image:vtube-laser_2.5_reverse_point_labels.png|400px]]
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[[image:channel-shape-corner-radius.png|400px]]
 
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== Use the Default Collection Process for Straight Cylinders==
  
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== Reset the Reversed Point Labels==
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<td width=300>
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Use the default straight cylinder collection process along the path of a corner radius like this. </td>
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[[image:vtube-step_collect_corner_radius_path_as_tube.png|400px]]
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</td>
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</tr>
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<br>
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== Build a Tube Centerline==
  
 
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You can reset the point labels from being reversed with the XYZ reverse feature.<br><br>
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Collect the corner radius for each straight just like you were collecting the cylinders in each straight.
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Right click on the XYZ grid and the click on '''Reset Point Labels'''.</td>
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When the collection is complete, right-click until you get a pop-up menu, then click on "Rebuild the Tube Model from Collected."
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You will see a tube that is formed around the path of the corner radii selected.
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At this point, the BEND ANGLES and ROTATION ANGLES are already correct. You will need to offset each leg slightly in order to get the correct LENGTHS (see below).</td>
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[[image:tube-shape_in_corner_radius_path.png|400px]]
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</td>
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<br>
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== Offset the Legs of the Path to Get the Correct Bender Data Lengths==
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<table>
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<tr valign=top>
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<td width=300>
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Offset the legs along the path to bring them to where you want the centerline to be.
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You can calculate the offset, or just estimate it.  Either way, the end result should be that the centerline matches the inner wall of the channel like in this image.
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In this model, the offset was 0.030" along the Y axis for this last straight.
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You will want to move the other legs of the centerline also.  In this shape, points 1 and 2 were moved right along the Y axis 0.030". Points 2, 3, and 4 were moved up the Z axis 0.030", and points 4 and 5 (the final leg) were moved left along the Y axis. This brought the centerline of the tube inline with the inner wall of the channel.
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</td>
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<td>
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[[image:channel-shape_move_legs_along_axes.png|600px]]
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</td>
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<br>
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== The Final Centerline Follows the Channel Wall==
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<table>
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<tr valign=top>
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<td width=300>
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If the tube centerline follows the wall that you want to use as the centerline for the channel-shape, then you now have the correct LRA bender data for the channel in the Tube Data menu.
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In some cases, you may need to adjust the radii to make the bend arcs follow the wall of the channel better. In this case, we just leave the radius values untouched, because they are already very close to the nominal values.
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</td>
 
<td>
 
<td>
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[[image:vtube_v2.5_reset_point_ labels.png|400px]]
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[[image:inner_channel-shape_bend_data.png|600px]]
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[[image:vtube_v2.5_effect_of_reset_point_labels.png|400px]]<br><br>
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[[image:vtube-laser_v2.5_tubeimage_with_pointlabels.png|400px]]
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</td>
 
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Latest revision as of 12:39, 4 October 2016

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What is a Channel-Shaped Part?

This kind of part is an extrusion that is not a closed tube shape. It looks like what you see in this image.

Channel-shaped-part.png


How To Find The Bend Data

Find the bend data for this kind of part by treating the path of one of corner radii as if it were a tube shape. If you zoom in on this part's edge, you will find two radii. Choose one of them using the standard collection process for tube shapes.

Channel-shape-corner-radius.png


Use the Default Collection Process for Straight Cylinders

Use the default straight cylinder collection process along the path of a corner radius like this.

Vtube-step collect corner radius path as tube.png



Build a Tube Centerline

Collect the corner radius for each straight just like you were collecting the cylinders in each straight.

When the collection is complete, right-click until you get a pop-up menu, then click on "Rebuild the Tube Model from Collected."

You will see a tube that is formed around the path of the corner radii selected.

At this point, the BEND ANGLES and ROTATION ANGLES are already correct. You will need to offset each leg slightly in order to get the correct LENGTHS (see below).

Tube-shape in corner radius path.png


Offset the Legs of the Path to Get the Correct Bender Data Lengths

Offset the legs along the path to bring them to where you want the centerline to be.

You can calculate the offset, or just estimate it. Either way, the end result should be that the centerline matches the inner wall of the channel like in this image.

In this model, the offset was 0.030" along the Y axis for this last straight.

You will want to move the other legs of the centerline also. In this shape, points 1 and 2 were moved right along the Y axis 0.030". Points 2, 3, and 4 were moved up the Z axis 0.030", and points 4 and 5 (the final leg) were moved left along the Y axis. This brought the centerline of the tube inline with the inner wall of the channel.

Channel-shape move legs along axes.png


The Final Centerline Follows the Channel Wall

If the tube centerline follows the wall that you want to use as the centerline for the channel-shape, then you now have the correct LRA bender data for the channel in the Tube Data menu.

In some cases, you may need to adjust the radii to make the bend arcs follow the wall of the channel better. In this case, we just leave the radius values untouched, because they are already very close to the nominal values.

Inner channel-shape bend data.png


Other Pages

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