Creo Parametric - Variable Section Sweeps (Part 3 - Relations with Trajpar)

in variable section sweeps you can write relations in the sketch using the special trajectory parameter trash par let's look at a few examples and I'll start with a simple example creating a sweep using a straight line trajectory and here we have our start point located I can hold down the right mouse button and choose sketch and for this simple sketch I'm just going to make a rectangle keep things nice and simple and let's change our dimension here let's give that a value of 1 and this other dimension let's give it a point 5 now let's write relations in the sketch to have these values change along the length of the trajectory I will click on the tools tab and then relations and when I do that the dimensions automatically switch from their numeric form to the symbolic form and I can click on them to write different equations here so I can say that this sd3 dimension is going to be equal to and I want it to start at an initial value of let's say 1 and then I can add tragic art to it plus trash par and again trash part is the special trajectory parameter and trash part has a value of zero at the beginning of the trajectory and a value of 1 at the end of the trajectory regardless of the length so again the length of the trajectory is normalized from 0 to 1 and let's write another relation I'm going to write one for SD for let's have that be equal to oops click in here equal to 2 plus trash par and I'll click OK and the values update for a tragic R of 0 let's go back to the sketch tab and click the checkmark to finish out of there and right now I just have this as a block tragic art has no effect here until I click on the button to say that I want to have a variable section along the length of the feature and you'll notice that now the dimensions changed so we have this scaling as the part is getting wider and getting taller along the length of the feature so again just a very very simple example there to begin with let's take a look at a second example and to make things easier to see I am going to suppress or temporarily delete the first sweep in the model and click on the sweep command I will select my trajectory here we see the start at the beginning and if I click on the sketch button to go into sketch mode you'll notice that my sketch references are just located sort of like a weird angle over here so I am going to cancel out and just look like we saw in an earlier video I can change the x-direction reference at the start and I could choose this datum plane called right and that way when I go into sketch mode you can see that my sketch references are sort of the way I want them to be sort of angled over here and for this one let's sketch a rectangle again and let's change our values let's have that a value of two and a value of one and let's change this to 0.5 and again I'm going to write some relations now so I'll go to the tools tab and relations and let's start with this dimension over here sd5 we're going to have that start just be the value of trash bar start at zero and go to a value of one and you can write more complicated mathematical expressions if you want so for example maybe I want the sd-3 dimension let's have this be equal to 1 + stretch far not that much more interesting but for the SD 4 dimension let's have that be equal to 2 + trash par squared and if you want to use other different functions in here you can if you click on the f of X button you can see all the different functions that you can use and in a moment I'll use one of my trigonometric functions for driving tragic Park so let's click OK the dimensions suggest let's go to the sketch tab hit the check mark and again right now the section is not changing along the length of the feature I'll click the button over here to make it a variable section and so we can see by having the distances change the length dimensions change we are indeed getting a variable section in our sweep hit the check mark and it's completed all right one last example this time I'm going to use a sine function when I am using trash bar so let's initiate our sweep feature I'm going to select the sketch that I use to create this disc and I'll click the button to say that this is going to be a variable section sweep let's click the sketch button and I'm gonna add in some sketch references to lock to the inside and outside of the disc and my sketch is just going to be a rectangle walking into my sketch references and let's give this value of 0.5 now let's write our relation tools relations and I'm going to pick the sd-3 dimension I'm going to say that this is going to be equal to 0.5 plus the sign of tragic arc and tragic r goes from a value of 0 to 1 so I'm going to multiply that time three-sixty and i'm going to multiply that by the number of waves that I want along here then let's take this entire sine function and multiply it by the amplitude of 0.5 that's good I will click OK and go to the sketch tab hit the check mark and there you can see a preview sort of looks like an image of the Sun but it's essentially sort of like a gear with the different surfaces I could use in a cam connection hit the check mark and the feature is completed I hope you enjoyed this video if you learned something in this video please give it a thumbs up if you liked the video please click the subscribe button to be informed when new videos are uploaded thank you very much

Channel: Creo Parametric

Views: 1,835

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Id: 9h_0rhLrWb0

Length: 7min 30sec (450 seconds)

Published: Mon Apr 01 2019