How To Import Channel-Shaped Parts

From ATTWiki
Jump to: navigation, search

Vtube-step logo 1.96.png Vtube-laser logo 1.96.png

VTS2 SplashScreen.png
Vtl screen hd scanner without logo.png

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.


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.


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