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Forums >> Revit Building >> Technical Support >> Elliptical stairs help

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Wed, Aug 16, 2006 at 5:19:45 PM | Elliptical stairs help

#1

Hilikus101


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I've been trying to create a run of stairs that follows an elliptical shape, but i can't get revit to cooperate - i have tried creating model lines, boundary lines, etc. but when i try to apply the risers, nothing...any advice or experience doing this??? Thanks.

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Wed, Aug 16, 2006 at 5:45:01 PM | RE: Elliptical stairs help

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TomDorner


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I find it easiest to place a straight run of stairs and then modify the boundary lines or draw new ones as the case may be. Be sure to trim or extend all the lines together. Try this method and see if you can get it to work. If not, post again. Tom

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Wed, Aug 16, 2006 at 7:23:33 PM | RE: Elliptical stairs help

#3

Hilikus101


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i have tried to modify the boundary lines, but the ellipse option is not offered when in boundry line mode - the ellipse command only comes up when using 2d linework - i have created the outline of my stairs w/ ellipse using 2d linework - is there a way to convert this to stairs?

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Wed, Aug 16, 2006 at 8:33:03 PM | RE: Elliptical stairs help

#4

TomDorner


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It doesn't look like stairs support ellipses yet. Up until a few releases ago Revit did not support any ellipses! The old work around was to use a series of arcs to simulate the ellipse. It looks like this might be your your best bet for now. Tom

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Wed, Aug 16, 2006 at 8:38:30 PM | RE: Elliptical stairs help

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Hilikus101


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im afraid my pm will allow nothing less than a true ellipse thanks though

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Thu, Aug 17, 2006 at 12:51:33 PM | RE: Elliptical stairs help

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robert


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how about a bit of cheating and draw the stair plan in autocad then import and trace? every time i a intricate geometry comes up revit freaks out and i have to go back to the trusted autocad. by the way what is a pm? here it means Prime Ministe good luck. robert.

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Thu, Aug 17, 2006 at 3:24:07 PM | RE: Elliptical stairs help

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Hilikus101


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project manager - i thought about outlining it in autocad and then importing it to revit - what i ended up doing was to draft the ellipse in 2d linework in revit - then i traced the part of the ellipse where i will have stairs with boundary lines at 11" each to simulate my tread depth - then i added my risers, starting each riser at the center point of the ellipse and extending them down to the 11" boundry lines i had traced over the 2d linwork with - then trim out the riser lines and extend them to the other side of the stairs....good times

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Thu, Aug 17, 2006 at 4:27:08 PM | RE: Elliptical stairs help

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jfurlong


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you could always create in inplace family and model the stairs, i know it takes time out you could get what you want easy enough that way

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Thu, Dec 17, 2009 at 9:22:21 PM | Elliptical stairs help

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RainaMc


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I am working in 2010.  I see this post was from 3 years ago but I am running into the same problem.  I have acutally drawn everything out and now I am tracing in Stair Sketch mode.  Why won't the boundary line pick option pick the eclipse?  Instead I am sitting here drawing individual little arcs inbetween every tread.  Does anyone have a better efficient idea on how to get it done?

 

Thanks,

Raina Mc


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Thu, Dec 17, 2009 at 9:35:26 PM | Elliptical stairs help

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RainaMc


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Well the sketch finished but they are going in the wrong direction.  I have tried using the flip arrow but I get an error message "The constraints of the sketch defining the highlighted element cannot be satisfied" and "Can't cut open/middle stringers geometry".  Then true to Revit form and fashion it deletes the element.


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Sat, Apr 17, 2010 at 10:44:07 PM | Elliptical stairs help

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unidesign


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I am using 2010 in the year 2010 and I have same problem. I just can't understand why Autodesk did not do a comlete job befor marketing it? and now I can understand why everybody is giving bad rating to Revit, well because it sucks!

I guess i will shift to Archicad.


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Thu, Feb 24, 2011 at 1:25:27 PM | Elliptical stairs help

#12

kikusko


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Same result in Revit 2011. If I m wrong please let me know.

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Thu, Feb 24, 2011 at 2:34:31 PM | Elliptical stairs help

#13

WWHub


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I don't understand why anybody wants to build anything to a true ellipse!  If you can show me how to dimension a true ellipse in a manner that will be used in the field, then I will use them.  But I don't believe you can.  So I never use them.  Instead - here is what I posted in another thread:

 

When we hand drafted and needed an ellipse (before templates '60's), we always used an approximation as described in the first link below. 

http://etc.usf.edu/clipart/76200/76201/76201_ellps_4cntr.htm

This link shows how close an appromation is to a real ellipse - note that very long, thin ellipses do not work as well.

 http://www.uwgb.edu/dutchs/MATHALGO/Ellipses.HTM

 

What describes these "approximate" ellipses are simple arcs and those you can use to do your stairs.  


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Sun, May 15, 2011 at 12:04:40 PM | Elliptical stairs help

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SJkachmar


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I am trying to Create Elliptical Stairs for Custom Residential Houses. Does anyone know if there is a way to do this? I am running intot he same problem as other users, I can only create arcs, or circles. I need to create the Ellipse because we want transfer the file through Inventor and Build the Stairs off of a CNC machine. 

Please help. 

 


-----------------------------------

 "Wherever you go, there you are"

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Fri, Sep 2, 2011 at 3:15:49 AM | Elliptical stairs help

#15

momarch


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Just came across this thread while looking for help with an elliptical ramp.  I managed to create a pretty decent looking ramp by tracing along model ellipse lines with very short, straight lines in a chain.  It involved a lot of "polyline type" work -- reconnecting segments that weren't properly connected, deleting double lines, etc., as well as making sure there weren't any extraneous lines where I offsetted and lost a few along the way. Had to tap the Tab key quite a bit to see if things were connecting and where the gaps were -- just like a pedit in Autocad.

I was pretty pleased when I looked at it in plan, but here's the rub ... when I looked at it in 3D, it turned out that it sloped UP the ramp properly when it went from one end of the ellipse to the other end, but once at the other end, it SLOPED BACK DOWN!  I tried everything to get it to keep going up, but no luck.  So Revit evidently does not understand the ellipse in the stair/ramp tool.

I do hope they get this ironed out because circles can be so boring.


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