It may take a little experimentation to determine how far in you need to cut the helix in half to get results that can be swept. I would have never In a million years thought of breaking the spiral! WarrenGeissler My first guess at why sweep didn't work was because the instantaneous radius of curvature at the start of the helix was too small but your examples showed that there was no direct correlation between the radius of curvature and sweep not working.
It appeared that total helix length and curvature may have had an effect so I just lopped off a few turn and it worked! The sweep fails when the width of the swept shape exceeds the distance between tow consequent turns or lines, because the resulting sweep intersects with itself..
So when you increase the number of turns to the point where the distance between turns is less than that width, you get the error message and the sweep fails.. This is not true. Check out the drawing WarrenGeissler posted.
A helix with a closer spacing worked whereas a larger spacing does not work. My theory is that when the total number of CVs exceeds some threshold or the radius of curvature is too small then the sweep operation fails. For the drawing cited, the failure is immediate indicating potentially that the calculation of the solid was never really started as some other issue was indicated. Reset those to match that of the incoming parameters, and the command will make the distribution more uniform.
What I said about the cross section is true, AutoCAD will always refuse to do the sweep if the resulting geometry self intersects, be that because of the cross section is wider than the spacing between the path segments or any other reason.. What WarrenGeissler file shows is that there are other cases beside the cross section being wider than the spacing, where AutoCAD considers the resulting geometry to be self intersecting..
Oddly enough, breaking the right and left spirals in WarrenGeissler file into pieces using "break at one point" and then sweeping along the parts results in a success!!!! And the resulting parts accept Union!!! And with break, the difference from the original spiral is barely noticeable.
What that may suggest in my opinion, is that this isn't just about the curvature, because that shouldn't change with break, or should it? Another odd thing: changing the swept shape for the first spiral to the left into a rectangle even wider than the circle originally used resulted in a success!!! So the only conclusion I could come up with, that the problem with the spirals that failed has to do with the relation between the vertices distribution of both the path and the cross section..
This statement and the accompanying picture in you previous response does not match what I've encountered. In my linked file here, I've set up the spiral to what I believe is the parameters listed by axm Reusing those parameters does not modify the curve any significant amount.
SEANT61 , my sincere apologies, I experimented a lot with the spirals, I used the spiral to the left in WarrenGeissler file, but it seems that it was modified accidentally along the way. Thank you for pointing out the number of turns, and I apologize again.. It's good that AutoCAD retains interest enough to get several users motivated to figure out one of it's quirks. Notice: updates available for Apache Log4j vulnerabilities.
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Showing results for. Search instead for. It has to be units-in my case cm tall and 60 units ride so the bigger kids can slide down no problem. My problem is making the 2D and thus 3D image. I'm not to sure how to go about this. I've tried doing the HELIX command but it's seemingly impossible to match up the two spirals to create the constant width and even create the slide. You can post now and register later. If you have an account, sign in now to post with your account. Note: Your post will require moderator approval before it will be visible.
Restore formatting. Only 75 emoji are allowed. Display as a link instead. Thank you so much for your comments. I know your frustration. I think that AutoCAD gets moody sometimes and likes to turn on you. But at least you are searching online and looking for help. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account.
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