cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Showing results for 
Search instead for 
Did you mean: 

Variable section sweep with multiple sketches?

Re: Variable section sweep with multiple sketches?

There was some difficulty in getting beyond permissions and setting up the spin, but this works well once set up.

Re: Variable section sweep with multiple sketches?

I think it's great that there are a few of us here that want to learn how to do things like this, to push the envelope (until it crashes!). I think we should always try and learn new techniques, so we can teach the others (that are actually willing to learn). I get very frustrated with Pro/E users that refuse to do anything more than the bare minimum to get the (typically sloppy) job done. I enjoy bouncing things back and forth between us!

We had the same trouble with the spin center's here. In fact, it was so bad after trying it a few times, we didn't like to use the 3D PDF's because they came in so bad. But, being the inquisitive and stubborn b#stard I am , I wanted to see if I could fix that, especially for assemblies like the wiring harness where the default CS is so far off to the side (all our cabling is constrained to the upper level assy's default CS for consistancy). I figured there had to be a way. I detailed the steps in a Word doc I posted in the Modeling forum about it. The pics are a little blurry (dunno why), but it works.

Let me know if that helps.

I'll be eagerly waiting your document Antonius!

Re: Variable section sweep with multiple sketches?

I've run into some difficulty in using Boundary Blends instead of a Variable Section Sweep.

I recalled that someone in this thread suggested that sketches could be made at the beginning and end of the VSS. This could be quite helpful in my application.

Frank: What technique do you use to have a sketch at the beginning and end of a VSS?

Of equal importance; I'd also like to ask how you can substitute your own datum positioning for the sketch instead of the default positioning that pops up as soon as you select "Create or edit Sweep Section". In what I see you are channeled into using whatever positioning that automatically gets chosen for you. For the life of me I can't see how you can substitute your own datum positioning for the sketch that I'd really like to have.

Re: Variable section sweep with multiple sketches?

If you're talking about swept/blend, it is easiest to just pre-define the sections:

sweep-blend.JPG

Re: Variable section sweep with multiple sketches?

I actually was inquiring about how to have definable datum positioning for a Variable Section Sweep, and also how you would be able to have this on both ends.

Boundary Blends do give you more flexibility in this regards, yet there are advantages to the Variable Section Sweep.

Re: Variable section sweep with multiple sketches?

The variable section sweep will only accept a sketch plane "normal" to the trajectory.

I don't think the VSS can be defined with an end sketch. As close as you can get it to have endpoints from your trajectories where the initial sketch will align with. You will still have the issue of the sweep ending prematurely on some trajectories. However, you can extend them.

Boundary blends are finicky but can be very powerful when defined in a manner that Creo want to see it.

This is why I introduced the Swept-Blend. Now you can take sections within your existing part; define one or more trajectories again from existing geometry, and blend them all together. Now you have a variable section each as defined by your "master" model; you are not bound by "normal" orientations of the -selected- sketches; and you can blend the end conditions tangent or normal to existing geometry.

Frank, you can weigh in here but I would think that a swept blend can outperform the VSS by adding an extra level of control.

Re: Variable section sweep with multiple sketches?

Well, yes, and no. With a VSS, you can't control the endpoints directly, but you can make sure your trajectories all force the end section to be what you want. As noted, there is no blend vetrtex, but yo can still force a line or curve, or even the entire sketched section to zero. What you cannot do, in a VSS is force a curve into a line, or force it to reverse it's curvature direction (i.e. convex to concave). I think a VSS is superior in that you're controlling the swept shape via the other trajectory curves along the entire length of the feature. A swept blend only controls the shape at those defined sections and interpolates things in between. so, sometimes you add more sections, and end up over-controlling it with some weird results. A boumdary blend works great, except you must totally define ALL the edges exactly, so it's more work, but you do get some extra controls not in the other features.

Like I said, I'd love to see VSS and swept blends combined, so you could add sections, reverse curvatures, and still be albe to drive all the vertexs in a sketch via other trajectories. And, to top it off, how about have a tangency, normal, and curvature continuous (REAL C2) options as in the boundary blends built into the VSS command? Ormaybe have them as separate features after the fact, like a surface extent or trim etc.? Maybe if they were's wasting so much time on ribbons we could get these REAL enhancements......

Re: Variable section sweep with multiple sketches?

I'm with you 100%. I really wish they could consolidate the major tools into 1 more powerful function.

From someone who really hasn't got his feet yet I find the options available to be very bewildering. I can almost reach the finish line with a specific tool and always have some reason that I can't take it in to completion.

I appreciate the dialog from this thread. It gives me ideas to go back to when it comes time to try an idea out.

Frank: So it appears with VSS you pretty much are roped into normal conditions with the trajectory; you mentioned something above. What you CAN do, is sketch a curve at the start, and at the end, then use those to drive the multiple trajectories. How do you add the end curve?

It is interesting when perusing the forum how people are constantly complaining about functionality and ease of use and what you receive is window dressing. The CAD system we are phasing out decided to take the Ribbon route as well. The last thing we would look at when reviewing CAD systems would be the Ribbon. I can get used to this, but there is no value added.

Re: Variable section sweep with multiple sketches?

I would first develop the curve you use for the origin trajectory, then sketch curves on planes normal to the endpoints of the trajectories. Then create your curves that you want controling the vertex(s), making sure they end up at the correct vertexes of the curves at the ends (and middle if desired. This way the other trajectory curves control the sketch the whole length of the origin trajectory, and end up exactly where you want them.