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Forums >> Revit Building >> Technical Support >> conical spirals
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Joined: Tue, Jun 5, 2012
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I am using Revit Architecture 12.
Does Revit Architecture 13 do cylindrical or conical spiral curves?
I know Revit Structure 12 will do cylindrical ones (As springs).
I’ve done it piecemeal but it doesn’t work so well. (See image attached)
Any tips would be appreciated.
Thanks
Grant Fiest
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http://www.youtube.com/results?search_query=stairs+in+revit+2013&oq=stairs+in+revit+2013&aq=f&aqi=&aql=&gs_l=youtube.3...3667.13734.0.13946.20.20.0.0.0.0.245.2419.6j13j1.20.0...0.0.lV98snC5OAo
Take a look...
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Thanks for getting back to me. My company has blocked access to this web site. I have a Web Access request submitted to access it, which takes a day or so. I'll check it out tonight on my home computer. I did try the spiral stair feature in Revit Arch12 and got it to work for a cylinderical stair. It wouldn't go beyond one flight of stairs to repeat itself over and over again. Not sure how to get this to work for anything other than concrete. (For materials such as a pipe.) Or how it would work for a conical spiral.
Regards,
Grant Fiest
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Got it to work using the builtin helix/sweep command in AutoCAD. then imported it into revit. Trying now to figure out how to convert the CAD file into Revit surfaces.
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If it is a solid (has surfaces), just import into a Revit family and assign a material to the layer.
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It's no good to bring this from Acad and import it into your drawing. Ideally, everything in a Revit project should be done in Revit, unless it is impossible to do. A conical spiral is possible, but it is not possible as an array, since all the loops have a different radius, but you could set the radius of each loop manually. An spiral of constant radius is easier, since it can be controlled by an array.
Edited on: Tue, Jun 5, 2012 at 8:09:00 PM
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I was able to create the conical spiral in revit. First I imported the AutoCAD file and partially exploded the spiral plan view and used it as a template to trace over. Partially exploding the spiral elevation gave me the angle of the downward spiral. Using a sweep and creating a circular shape I was able to model half of the loop at the correct angle and then mirror that (X/Y axis) and rotate the loop (Z axis) about the centre of the preceeding loop downward matching the previous angle. Doing this over and over until I completed it as per the attached sketch. this is the only way I was able to get it to work so far in Revit. It would be nice if Revit had the Helix tool as it is set up in AutoCAD. Down the road version upgrades I guess.
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Well, there is no "helix" tool yet in Revit. You are correct on that, but an helix can be done using Revit tools, instead of bringing stuff from AutoCAD, even worse, exploding AutoCAD stuff in Revit. That is strongly not recommended.
I recently wrote a blog article about a helix with multiple loops (of constant radius, not conical, though). If you are interested in reading it, these are the links, in two different places:
In my blog: http://planta1.com/forum/entry.php?17-How-to-create-a-parametric-helix-with-multiple-loops
In Wikihelp: http://wikihelp.autodesk.com/Revit/enu/Community/Tutorials/Create_Helix_with_Multiple_Loops
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Thank you. I will check these out.
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this could be done quickly like so:
model a cone. model a jagged void (see pic.) cut cone with void, use the lines of the cut cone as the path for a sweep, and voila; a tapered spiral. (then hide or delete the cone.) Not mathematically perfect since a spiral does not rise linearly in elevation, but it looks okay.
perfect tapered spirals would be best done as hemispherical-pathed swept blends. not too time-consuming if you lay out the series of profiles in an elevation or section first, with detail lines.
Edited on: Wed, Jun 6, 2012 at 6:44:36 PM
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That is a creative and interesting solution for the conical spiral. I wonder if it could be made parametric, though.
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I posted this a couple of years ago: http://www.revitcity.com/gallery.php?action=view&gallery_id=11724
same process with a cone or a cilinder...
Edited on: Thu, Jun 7, 2012 at 4:50:56 AM
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Parametric... divide the surface, turn on the nodes, create a spline by the nodes...
Edited on: Thu, Jun 7, 2012 at 7:43:47 AM
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I am aware of that kind of solution, which takes too many steps and at the end, it does not produce a fully parametric helix with a parameter to repeat the number of loops. Also, it presents a problem for an helix of constant radius: the section of the helix gets twisted. You don't notice it when the profile is a circle, but try to make a slide, and you'll notice it.
Edited on: Thu, Jun 7, 2012 at 5:59:45 AM
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The jagged void solution is cool. Never thought of that.
I do however disagree with the suggestion of NOT importing content from other applications like AutoCAD and Sketchup into REVIT. I have been 'greatly successful' on Importing and Linking AutoCAD and Sketchup models into REVIT and then using that content to build local REVIT content. What you do with the imported / linked model content afterwards is up to you.
I say go ahead and feel free to import AutoCAD and Sketchup models.
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