Vagulus Posted June 16, 2014 Share Posted June 16, 2014 I have absolutely no idea whatsoever how to create this model. It's Problem 7.51 from Giesecke F.E., Mitchell A., Spencer H.C., Hill I.L., Dygdon J.T., & Novak J.E. (2014). Technical Drawing. Upper Saddle River (NJ) USA: Prentice Hall, p.238. Note the spokes have elliptical cross section, and vary in both thickness and width from Hub to Rim. Nothing I have read, watched or heard about equips me for this one. I really would like to know how it is done, if someone has the time to show me. Thanks Flat Bed Pulley.pdf Quote Link to comment Share on other sites More sharing options...
ReMark Posted June 16, 2014 Share Posted June 16, 2014 If I were doing the spokes in AutoCAD I might use two ellipses and the Loft command. Quote Link to comment Share on other sites More sharing options...
JD Mather Posted June 16, 2014 Share Posted June 16, 2014 If I were doing the spokes in AutoCAD I might use two ellipses and the Loft command. Same process in Inventor. (or Extrude with taper might work if the taper angle is calculated, but I'm not sure this will return correct major and minor axis. Just use Loft) Somewhat similar (lofted ellipse) post #112 here http://www.cadtutor.net/forum/showthread.php?85808-Inventor-101/page12 Quote Link to comment Share on other sites More sharing options...
Vagulus Posted June 16, 2014 Author Share Posted June 16, 2014 Thanks to you both, but the more I look at this problem the more complex it gets. I thought about Lofting one Spoke and using Circular to draw the other four, but I cannot see how to position the ellipses so that the Spoke blends properly into those thickening spines that support the Hub and Rim. Quote Link to comment Share on other sites More sharing options...
JD Mather Posted June 16, 2014 Share Posted June 16, 2014 Fillet the intersections. Quote Link to comment Share on other sites More sharing options...
Vagulus Posted June 17, 2014 Author Share Posted June 17, 2014 Same process in Inventor. (or Extrude with taper might work if the taper angle is calculated, but I'm not sure this will return correct major and minor axis. Just use Loft) Somewhat similar (lofted ellipse) post #112 here http://www.cadtutor.net/forum/showthread.php?85808-Inventor-101/page12 As usual the tutorial was the answer. The trick was creating the workplanes in the right place. I was getting confused with using rails. Thanks Quote Link to comment Share on other sites More sharing options...
JD Mather Posted June 18, 2014 Share Posted June 18, 2014 The actual design is a bit different than that and trickier than you might expect. Quote Link to comment Share on other sites More sharing options...
Vagulus Posted June 28, 2014 Author Share Posted June 28, 2014 Hi JD I'll leave the finer detail for a later day. What you see is about as far as I can get at the moment. However, should you find the time to do it the RIGHT way, and post it so I can see how it is done, I am sure I will learn some useful things. Thanks Quote Link to comment Share on other sites More sharing options...
gazza_au Posted June 29, 2014 Share Posted June 29, 2014 Try creating a tangent workplane then sketch and extrude both ways. Quote Link to comment Share on other sites More sharing options...
Vagulus Posted June 29, 2014 Author Share Posted June 29, 2014 I did ! It's a problem that the spoke is tapered. I wound up creating two workplanes with the spoke cross-section profiles and then lofting the spoke as a solid. Quote Link to comment Share on other sites More sharing options...
JD Mather Posted June 29, 2014 Share Posted June 29, 2014 Try creating a tangent workplane then sketch and extrude both ways. Try posting your solution to this problem. Quote Link to comment Share on other sites More sharing options...
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