stenews Posted October 1, 2011 Share Posted October 1, 2011 How guys, I attached a draw of a spiral column that I 'd like to make into a 3D solid. Could some of you explain me a right procedure on how to do those kind of things? Thanks, Stefano. CSP16-6.dwg Quote Link to comment Share on other sites More sharing options...
ReMark Posted October 1, 2011 Share Posted October 1, 2011 Use the HELIX command. Construct your helix then use the SWEEP command to sweep a circle along the path of the helix. Quote Link to comment Share on other sites More sharing options...
stenews Posted October 1, 2011 Author Share Posted October 1, 2011 Hi ReMark, I'm glad to read your post. Thanks! I can't make an helix path so that each individual spiral are tangent each other....why? Could you show me how you create the path? Second, it's not the path that I attached isn't it? Quote Link to comment Share on other sites More sharing options...
SEANT Posted October 1, 2011 Share Posted October 1, 2011 I think you will find that more than one Lobe/Sweep will be required to reproduce that column. See this thread with a similar question: http://www.cadtutor.net/forum/showthread.php?57899 Quote Link to comment Share on other sites More sharing options...
ReMark Posted October 1, 2011 Share Posted October 1, 2011 Sorry, I never opened your DWG file. Follow the link SEANT provided. Quote Link to comment Share on other sites More sharing options...
JD Mather Posted October 1, 2011 Share Posted October 1, 2011 (edited) Helix (not spiral). Sweep the circle. Array (polar) copies (looks to be 5 total, but can't really tell without closer inspection). Slice or presspull or extrude subtract to get ends as shown. (keeping in mind that the 2D is a bit of simplification of real geometry) Post back if you can't figure it out (you might see the tutorials in my signature). Edited October 2, 2011 by JD Mather Quote Link to comment Share on other sites More sharing options...
stenews Posted October 1, 2011 Author Share Posted October 1, 2011 @SEANT Thanks for your reply! it seems that more than one had the same question. I'll try the study a bit that and I'll see what I can do with it @JD Mather and ReMark thaks to you too! mate I'll try to play with it and in case I can't go out with it I'll post more question to you guys! Thanks for now! Quote Link to comment Share on other sites More sharing options...
stenews Posted October 2, 2011 Author Share Posted October 2, 2011 @JD Mather Post back if you can't figure it outI'm really stacked with it, could you post me back a step by step how to? you might see the tutorials in my signaturewhich one? I mean, I surfed in your tutorial web site but I couldn't find nothing similar. Thanks a lot for your help Stefano. Quote Link to comment Share on other sites More sharing options...
ReMark Posted October 2, 2011 Share Posted October 2, 2011 Did you ever check out the link SEANT posted? Quote Link to comment Share on other sites More sharing options...
stenews Posted October 2, 2011 Author Share Posted October 2, 2011 @ReMark Did you ever check out the link SEANT posted? yes I did, and I learned a lot reading that, but I'm still having problem to understand the basic procedure on how to draw the very first part of the spiral column The picture JD Mather did is exactly what I should be able to draw...I hope he will post me a step by step procedure... I appreciate your help too! Quote Link to comment Share on other sites More sharing options...
SEANT Posted October 2, 2011 Share Posted October 2, 2011 A Sweep - with the Twist option - is another method. The lobes on the profile may need to be “squashed” (i.e., elliptical) to make the elevation look appropriate. I’m still guessing a bit here but these parameters look pretty close. The model can be fine tuned via the Properties Panel. Column.dwg Quote Link to comment Share on other sites More sharing options...
stenews Posted October 2, 2011 Author Share Posted October 2, 2011 (edited) @SEANT ...these parameters look pretty closeyou're right mate! your interpretation looks absolutely fine to me! but how do you do that? I need to be able to reproduce it by myself... thanks, stefano. Edited October 2, 2011 by stenews Quote Link to comment Share on other sites More sharing options...
SEANT Posted October 2, 2011 Share Posted October 2, 2011 Given that the original 2D geometry is only a rough approximation, a lot of the parameters I chose were by based on what match visually. As JD mentioned, the original sketch suggests five lobes (due to approx. 2 ½ division shown on the one side). The lobes twist at about 45 degrees, so I gave the flat profile (see the region in the file I uploaded) an elliptical lobe that compensated for that twist. See this thread for additional background: http://www.cadtutor.net/forum/showthread.php?47210-sweep From there, it was just a matter of matching the geometry by varying the “Twist along Path” variable in the Properties Panel. Quote Link to comment Share on other sites More sharing options...
stenews Posted October 2, 2011 Author Share Posted October 2, 2011 @SEANT cool! I see the link you posted to me you had a brilliant idea to use Sweep - with the Twist option...I think I'm getting a bit more your point now Thanks for your interest Stefano Quote Link to comment Share on other sites More sharing options...
JD Mather Posted October 3, 2011 Share Posted October 3, 2011 See attached image for steps. (I reversed the image because I had the helix going the wrong direction.) Create the helix sweep path and profile. (pitch 12.125) length > 50 Sweep the circle. Polar array around the centerline 5 copies. (the new array command in 1012 creates a new "array object" (might be a more precise description - but I'm not really familiar with AutoCAD anymore) Explode the array "object". Union the array. Create a circle (blue) (larger than the helix) up one diameter of the profile. Extrude the circle 50. _intersect the two to cut of the ends to desired (50?) length. Quote Link to comment Share on other sites More sharing options...
Denimoth Posted October 3, 2011 Share Posted October 3, 2011 _intersect the two to cut of the ends to desired (50?) length. You could also use the SLICE command to do this if you have a reference point for the bottom and top cuts of your solid. Quote Link to comment Share on other sites More sharing options...
JD Mather Posted October 3, 2011 Share Posted October 3, 2011 You could also use the SLICE command to do this if you have a reference point for the bottom and top cuts of your solid. Which is why I suggested Slice in my first response in this thread. Quote Link to comment Share on other sites More sharing options...
stenews Posted October 3, 2011 Author Share Posted October 3, 2011 @JD Mather I'm very thank to you I see what you mean now! Everything in my mind is much more clear! I appreciate you help @Denimoth you're right too! Thanks mate Quote Link to comment Share on other sites More sharing options...
3D generator Posted October 11, 2011 Share Posted October 11, 2011 I have step by step instructions for drawing a helical column shaft but it's too big to post here. Please feel free to contact me through the forum if you'd like a copy of it. Thanks. Mark Quote Link to comment Share on other sites More sharing options...
stenews Posted October 14, 2011 Author Share Posted October 14, 2011 @3D generator ...if you'd like a copy of it. yes, why not? it'll be great to see it Thanks! Quote Link to comment Share on other sites More sharing options...
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