- Building and detailing a space helmet
- Making a flexible duct
- Building details on round pipes
- Modeling organic objects
- Using the SrfSeam command to move seams out of your way
Skill Level Intermediate
- [Instructor] In this final lesson on fillets we master one more filleting skill. Here we check out the default settings for the fillet and then find out how they can be modified or refined for better and more controlled results. Let's zoom in to this back row of examples. The command solid fillet edge you may not realize has several ways to input the fillets. The default is called rolling ball. So, imagine this edge that just got filleted, it had an imaginary sphere that ran around that edge.
The result is we have a radius equal to the sphere that rolled around. Now, it looks very clean and nice for a couple of reasons. This is a short path, but these two surfaces, the top and walls are perpendicular, which means the angle also doesn't change and therefore this radius stays the same and the rails stay the same. The rails are simply the two edges of the fillet. Here's the bottom rail, here's the top rail. Those stay the same distance apart, only because the two surfaces are always the same angle.
Let's see where this starts to vary. This shape over here, we're noticing that the rails get farther apart or closer together. So, why is that? Well, the angle between the two surfaces change. The rolling ball has to bite more or less. It's actually the exact same radius everywhere. It just looks a little confusing 'cause the rails are moving in and out, but the radius is identical using rolling ball, and you can get into similar problems on more complicated edges here.
This actually kind of changes direction radically right there and then it gets tighter here. It's kind of a medium distance apart there and on this section here where the angles are the most severe you get the largest bite or most exposure of the rolling ball. But remember, the radius of the rolling ball is the same everywhere. It's the rails that get closer or farther apart depending on those surface angles. Let's take a look at these same three pieces of geometry and now modify the default rolling ball setting.
I'm going to turn that on and we'll zoom around. We actually don't have to do the example here under number one because it would look identical. Remember, since the angle of the two surfaces is not varying we're going to have two things that look identical, both the radius and the distance between rails. That's kind of a unique case, doesn't happen all that often. As we saw in example two, the rails do get farther apart. Let's see how we can control that. So, I'm going to right click in the command line area, fillet edge.
The first thing you should always do here is select the radius. If you select it later a lot of times this does not stick. So, I'm going to type in 15. Then I'm going to select this edge here. Fortunately, it's fairly simple, went all the way around in one piece, then right after you accept the final one, right now I'm just accepting the preview, and right here is where you change the rail type. It is defaulting to rolling ball as we've mentioned. We need to switch it to distance between rails.
Now we can let the command finish and you'll see it looks a little bit busy here, so I'm going to go ahead and select this guy and under the properties panel I like to turn off the ISO curves if it's getting in the way. So now we'll see these rails are the exact same distance everywhere. I think that's a much nicer looking solution, but if you're guessing that their radius is changing you are correct. I typed in 15, but there's going to be areas that are a little bit lower and a little bit higher and it does that to maintain the distance between rails.
It's kind of the override. Let's do the other example here, to wrap this up. I'm going to right click again in the command line. There is the fillet edge command. Change the radius first. We're going to try eight, I'm not sure if this is going to work, that's a pretty tight corner. Now this was constructed from a curve, looked like it was extruded upwards which tells me it's probably broken into pieces and that means the edges here will probably need multiple selections. So, we could go all the way around or, don't forget you got chain edges, so the next thing you pick will go around to the beginning of whatever you selected first.
I'm going to right click to accept that. We have the preview phase, so I'm going to right click and a couple more times and there's the solution. A lot of my students will think this looks pretty good. It went all the way around. I don't see any major problems, but I'm in perspective and I'm a little bit picky. That gives me the ability to zoom in here and I'm seeing something not really clean or kosher. That's got a bit of a pinch. And if I rotate around here we've got a really serious problem.
This is completely blown apart. So, that tells me the radius just didn't fit and the rails kind of blew themselves up, so this is a really obvious time where you want to stop, control Z, and redo that with a smaller radius fillet. So, we used eight, I would probably go down to like six. Remember, in this process there always should be in perspective as much as possible checking out the results, moving and zooming and panning, and if something does not look right, go ahead and undo it, and fix it right now because if you continue to work on this file or this model you could just make these seemingly minor problems much, much worse.
So, these checklists and examples should definitely help illuminate the sometimes confusing concept of filleting. Mastering fillets is mostly a science governed by manufacturing requirements and constraints. However, there's still a large component of art, so use your aesthetic skills to make sure it looks right as well.
Q: Why can't I earn a Certificate of Completion for this course?
A: We publish a new tutorial or tutorials for this course on a regular basis. We are unable to offer a Certificate of Completion because it is an ever-evolving course that is not designed to be completed. Check back often for new movies.