Join Veejay Gahir for an in-depth discussion in this video Tube Flange: Tangent Offset, part of Alias Essential Training.
- In this video, we're going to revisit the Tube Flange function, but, this time we're going to use the Tangent Offset Option. So, let's go ahead and open up Tube Flange and you'll notice at the very top, under Specify, I can change from Center radius which we used before to Tangent offset. So, before we go into this, let's take a look at the data that we're going to be using. So, this data as I mentioned before was four separate pieces of surface. And if I put on the Cv/Hulls, you'll notice that there's actually larger slabs that have been trimmed out from this hull. So, essentially, we have a face here.
We've go four faces. So, if I untrim these surfaces. Let's go to Surface Edit. Trim, Untrim, you'll see that's the base or the parent surface. And if I shade that, you'll notice that they encompass that hull. So, let's go back, wireframe, and let's go back to Surface Edit, Trim. I'm going to trim them back like so. Select, spacebar to accept, just click in the middle and spacebar to accept.
So, here we are back into that original condition. Now, before we go into the Tangent offset function, let's select a very simple scenario to explain how this works. So, here I've got a planar surface and I've got an isoparm that runs right down the center of that surface. And that isoparm lines up with this grid, as well. Now, these grids are set at 100 millimeters apart. And also, I've got two keypoint curves and each keypoint curve, if I do a ctrl+5, Information Window, is 75 millimeters in length as you can see here.
Okay, so let's go ahead and create a Tube Flange. So, the Tangent offset, Specify, Tangent offset has been set. And we're going to set the Tangent offset value to 100 millimeters. So, let's pick this isoparm in the center, and if it goes to the wrong side, I actually want it to come this side, the left hand side, so I can click on Flip or I can click on this option here. So, let's go to our back view now, which is looking true onto this now. And you'll notice that we have this blue radius, as well.
While this blue radius is something that Alias provides us and that is if we used a Form Factor of 1. In other words, a true hundred millimeter radius is represented by this blue circle. So, that gives us guide as to where a true radius would be. But, we're going to use a value of .5. So, let's accept that and we're going to go ahead, Pick object, and let's pick the result in Surface. Now, you'll notice now that the Tangent point for this fillet is here.
And what it does, it offsets a hundred millimeters along the surface and then a hundred millimeters down from that surface. So, let's go back to the back view. The end of this fillet meets at this corner point of these two grids. So, that's correct. Let's press "q", query edit and let's reopen this. And this changes now to 75. Again, we get a value here that gives us representation of a Form Factor of 1. But, we're going to change this back to .5.
Again, purely a guide for us. Let's go ahead, now, and select this radius and as I mentioned before this keypoint curve and this keypoint curve here are exactly 75 millimeters. So, again what's happened is offset along the surface, 75 millimeters, and then down from the surface, 75 millimeters. So, the fillet now ends exactly at the end of this keypoint curve. So, the keypoint curves are just purely just to give some idea of the dimensions that have been offset.
Okay, so now we know how this works. Let's go back to our original data. Let's open this back up again and we're going to change this value to 50 millimeters. So, let's go ahead and pick this edge. And again, so, as we know that these aren't trimmed surfaces. So, this tangent line has been offset along the surface, 50 millimeters, and then inboard 50 millimeters, as well. So, that's how that works. And we're going to change, now, from Sweep angle to Parting line. So, Parting line opens up some Vector options, here.
And we're going to choose the Y Vector. So, if we go into our left view. We've chosen the Y Vector and we've chosen a Draft Angle of 10 degrees. So, as I zoom into here, what I should be seeing is two parallel lines for this Flange. And that is indicating the Draft Angle. And sure enough, I can see two parallel lines, here. I can also select a Vector. So, if I say "Create Vector", then I can pick this Vector, here, and spacebar to accept.
And now that is my Parting line. So, if I look down true onto this Parting line, I should see two parallel lines again. Now, I'm kind of eyeballing this and I really want to be more accurate. I want to see true unto that Vector. So, how do I do this? So, very simply, just go to Construction, and let's create a Plane, Geometry, and let's select this Vector and let's say "Set Construction Plane. Now, what I can do is I can rotate my model like this when I get true onto this or close, I can just press on the top view.
And now, I'm looking true onto that Vector. And what I'm looking for again are two parallel lines right here where my cursor are, and that's exactly what I'm seeing. Let's go to Construction, Toggle Construction Plane, and we're going to go back out into this view, here. So, let's go to left, now we can go to this view, here. So, using this Vector, we've set up a 10 degree Draft with a Parting line option and the result in Surface is tangent because we have these tangent indicators are all green.
So, that's how you use the Tube Flange with the Tangent offset option.
- Manipulating views and entities
- Working with layers
- Creating curves
- Sweeping, extruding, revolving, offsetting, and blending surfaces
- Modifying geometry
- Moving, scaling, flipping, and rotating objects
- Trimming curves and surfaces
- Creating copies of objects
- Aligning, combining, and splitting objects
- Analyzing geometry
- Shading models