I have the wrapped curves projected through "normal to surface" onto the tapered surface and results are pretty satisfactory.
I am getting obsessed to this a little . I found a way to allow me to sweep along a closed contour in Creo and this allows me to create the helical spring with constant gradient. Just want to share it and please ignore if you are already aware of this trick:
yes, there is a relation in its sketched section. For some reasons, Creo does not allow trajpar to work on closed contour. You may educate me more on this. Thanks.
I extended one end of the trajectory curve to avoid both ends meet at the same point (closed loop). With this way, I can sort of "cheat" the creo and it allows me to complete the sweep feature. The excess can then be trimmed off.
My only consideration with the tail is the additional work required to manage pitch accurately.
Two half sections will take care of that.
Also looking at the conical/tapered versions.
More and more are sheetmetal rules required to know where to place the origin curve.
K and Y factors should be considered for profile sections not round.
true, the pitch is hard to control in this approach. I try to address this issue by having a continuous sweep trajectory, and this is done by repeating the path section and select them sequentially during sweep. What do you think?
I think this is where we started.
The problem with this technique is that the pitch is not constant at the intersection.
You will see a "wave" in the long section.
I have a real use case for its application - to model a flex geometry wrapped on a rectangular staright/tapered plastic insert.
With further expansion of the approach, the slant angle I added to the sweep section allows me to produce both straight and tapered geometries. This can be converted to a sheetmetal model and can be flatten to show its flat geometry !
...now put a parallel one outside this one.
Use the second one to orient the "blade".
This will clean up the corners somewhat.
Here is a solution using just three features.
It works also as conical version.
It was created with Creo 3.0. If you can`t open it I also can provide Creo 2.0.
Thanks to Antoni for the Creo 2.0 version.
Here is a short description and some screenshots.
1. Datum point (offset coordinate system)
2. Curve through pionts
- straight line
- add fillet radius
- Selection plane control >> Normal to Projection ( Direction reference in this case "bottom side" )
I really like the way this turns into a Fresnel lens if you leave the default projection.
All you need is a guide curve to manage orientation of the section.
The true beauty behind this is that if you come up with some very weird shapes.
The challenge with this is to maintain a constant pitch.
If you can manage the math in a spreadsheet properly indexed, the only limit becomes the single radius entry.
Edit: the attached creo 2 file uses 2 curves allowing for orientation control. This helps manage the flair on the corners.
It also brings your computer down to its knees if you lack horsepower.
If you play with it, you will also see some of PTC's shortcomings in Sweep.
required solution if possible give part file in 3.0 for detailed understanding . My level in creo is beginner hence requires help
Thanks for sharing. This provides another alternative with less steps to model the rectangular coil . I like it !
For my application, the shape may be quite irregular/odd and inputting the coordinates of those points may be challenging. One example of the models is shown below:
The strip (flex) needs to be able to flatten in sheet metal to illustrate its 2D geometry. Any idea how to simplify the point input?
Or you'd be stitching several fragments together to get the full part
In keeping with the idea, however, remember that you can scribe a sketch onto a face while flat.
This could help in selecting an intent curve.