tonykaos Posted January 19, 2017 Share Posted January 19, 2017 Hi all. Forgive me if this has been asked previously and I have missed the thread... I am a total noob to AutoCad and this forum. So, heres what I am trying to achieve. I am working on a design project for University. I have imported the curve of a tractrix horn (Think of a gramophone horn) generated from a calculator (TractrixCal), which is perfect. I am able to generate a 3D object from this curve, but what I want to do is bend the horn, like you would see in a gramophone horn. Currently, the horn is straight (See image). Sorry for being a bit of a simpleton regarding this, but this is my first autocad experience! Thank you for any help you can offer! Quote Link to comment Share on other sites More sharing options...
ReMark Posted January 19, 2017 Share Posted January 19, 2017 You'll have to construct the bent portion of the horn yourself from scratch. You have some dimensions to work with? Quote Link to comment Share on other sites More sharing options...
tonykaos Posted January 19, 2017 Author Share Posted January 19, 2017 Thanks ReMark. This could be problematic as the horn dimensions are fixed due to the required cutoff frequency of the horn. Quote Link to comment Share on other sites More sharing options...
tonykaos Posted January 19, 2017 Author Share Posted January 19, 2017 Does anyone know of a 3rd party software that will allow me to bend the horn, without changing the length of the pipe? Quote Link to comment Share on other sites More sharing options...
ReMark Posted January 19, 2017 Share Posted January 19, 2017 Thanks ReMark. This could be problematic as the horn dimensions are fixed due to the required cutoff frequency of the horn. So? You have a fixed length centerline right? You can't figure out how to get a curved section in and still maintain the fixed length? Quote Link to comment Share on other sites More sharing options...
tonykaos Posted January 19, 2017 Author Share Posted January 19, 2017 Can this be done, while maintaining the horns flare rate? The flare rate, throat diameter and pipe length are all fixed to achieve the desired cutoff frequency. Sorry ReMark, I am a sound engineer, so all this side of things are new to me! Quote Link to comment Share on other sites More sharing options...
ReMark Posted January 19, 2017 Share Posted January 19, 2017 You're talking Greek to me as well. Do you have an image of what this curve would look like? Quote Link to comment Share on other sites More sharing options...
tonykaos Posted January 19, 2017 Author Share Posted January 19, 2017 Two worlds collide! This is the sort of thing I am trying to achieve with my horn. Quote Link to comment Share on other sites More sharing options...
ReMark Posted January 19, 2017 Share Posted January 19, 2017 Doesn't look that difficult. I would draw it in two parts. The first part would be the section that looks like a question mark and the second part would be the flared horn. I'd layout the centerline of the first part then depending on the shape I wanted I would loft two or more circles one at either end at the minimum) using the centerline as a path. A down and dirty attempt using two lofted circles.... Quote Link to comment Share on other sites More sharing options...
tonykaos Posted January 19, 2017 Author Share Posted January 19, 2017 Ok, thanks for your help. thats definitely food for thought. Its not the approach I was hoping for, but it is surely worth looking into. Cheers ReMark! Quote Link to comment Share on other sites More sharing options...
ReMark Posted January 19, 2017 Share Posted January 19, 2017 Well maybe it can be done in Inventor but I can't say for sure as I don't use the program. Quote Link to comment Share on other sites More sharing options...
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