breaking up edge curves

[2ms1]

Let's say you wanted to make a blend between the top half of acube and the top half of a cylinder oriented such that the circular cross-section ends are parallel with a face of the cube.


And let's say you wanted to create the two end curves by using edges, so making a chain of edges (I realize you would do it differently for this particular example I've chosen to avoid unnecessary complexity of question, but in the thing I'm actually doing it's necessary to use the edges).


How could you break up the side edges into halves so you could select curve chains that only cover the top half of each of the two end shapes rather than having to use the entire side edges of the cube, for example?
Edited by: 2ms1

 

[rmatija]

Aplay part

 

[2ms1]

Sorry, I do not understand whatthis means.

 

[design-engine]

I don't understand the original question. I feel like Im doing a highschool algebra problem and I have to read the problem over and over. maybe I should read it one more time after a cup of coffee

 

[2ms1]

Ok, to make a blend you need two curves to serve as the beginning and end of the blend. Let's say you have a solid box or cube or whatever at one end and would like to use its edges on one face as the first curve of the blend. And then on the other end of the blend you would like to use edges of another solid like the traingular thing shown in picture below (I like it better than the cylinder mentioned above for example).


Now, if yoyu select the edge chain of each shape, then do Copy>Paste, you get a set of datum curves that each represent one edge of the same.


So, in the case of the rectilinear thing below, I Shift-selected an edge sogot the thick red lines representing the chain of edges, then Copied and Pasted, resulting in 4 datum curves (one for each edge).In picture below I've selected 3 of those datum curve along with same thingsfor the triangular shaped solid.


Now I would like to make a boundary blend simply connecting the top halves of each of the two shapes. However, the datum curves for the "sides" of each "thing" below run the full length, so there is no curve available for only making blend between the top halves. Is there any way to break the edge curves up into small curves or something like that?


I realize that, in this case, I could simply create two sketches that trace the edges and simply make the "sides" in sketch half the length. However, in the thing I am actually doing, the shapes I am blending together are completely 3D varying and there is not surface or plane or anything I can sketch on. I'd show what I'm really doing but it's extremely complicated to explain. If I could learn how to get just the top halves in this example (without using any sketcher), then that should provide the information one would need in order to do what I am actually doing. Sorry my question wasn't more clear before. I hope time around it'sat least somewhat translucent?

Edited by: 2ms1

 

[design-engine]

Ok.... I created a skin surface. A boundary surface that only looks at two edges as opposed to the four part boundary we grow to cherish.

Control gets you to the other side. Shift adds to the selection set. To ramp this further. Give yourself a PNT so you can connect the control points. Can't do that in Solidworks or Alias for that matter.

this image uses control points to control the first corner of the rectangle to the parametric control points.
In my classes I refer to this technique as a parametric rasp because a designer can control parametrically how much filler or sanding should occur.

Next to force tangency. Pro/E sometimes gets confused on solids like this example so you often have to be more specific.

now I need help with my race plastic. Never done fiberglass work outside of a virtual world of Pro/SANDPAPER... That is me at Black Hawk Farms Raceway in Belot, WI ... I'm off to the car wash to pressure wash the plastic before repairing...
Edited by: design-engine

 

[2ms1]

Looks good but I was wondering how to not have to use the full length of the side of the shapes. That is, I was wondering howone can use only the top half of the edge of the sides of the shapes. In our images it shows the full lengths of the side edges highlighted. However, I would like to be able to use only the top half of each.

 

[jeff4136]

Look at:
Help
. Pro/Engineer Fundamentals
.. User Interface Basics
... Chains and Surface Sets
.... Chains
..... To Trim or Extend a Chain


It's the Details button on the curve collector you're interested in.

 

[design-engine]

there is a white square ... I call a handle.You can tug and pull on the hanlde and use shift to snap to a corner.

Ill have to remodel the example, I did that earlier example at the office.
Edited by: design-engine