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Noob question - round stairs

K

KredeDK

New member
KredeDK,

A few options can produce what you are describing, which is usually the case. You probably want to try this with a surface, however, since you are new it may be best to make a solid shape large enough to cut the steps from later.

try looking up these:
1) graph features: based on a graph to determine the profile
2) helical sweep: makes a feature typically used in a screw thread
3) wrapped datum curve: a curve is wrapped around a body and becomes a trajectory for a sweep

there are probably other options as well. It can benefit you to do things in a different order in some cases. For instance, do the curved surface and then build the steps since they are probably easier.

Just a thought...

M
 
Thank you very much for your answer!


Do you have any tutorials, or maybe a link where I can learn more about there features?
 
on using a graph...not my strongest suite..this maybe be a problem..from the ptc webpage
<LI>A sketcher coordinate system is required for datum graph features.
<LI>For Sweeps there can only be one y value for each x value. So, no vertical lines are allowed. </LI>


seems it would be tough to make the stairs without vertical lines..
 
for Wsylvester,

not to be cranky, but...whats the point of your reply? I don't think I can give you any cookies for a non- solution hahah... :)

Item 1) Sketcher coordinate system is easily added...you merely drop one into the graph sketch, and use that for the CSYS line up with a model CSYS.
Item 2) A single sweep might be best for the lower surface, which was the question at hand. However, the steps might be possible. I would probably just remove the excess revealing a step instead of trying to create the whole feature in one shot.

I would sweep the lower surface using the graph or a datum curve and then pattern, along that surface, a step feature.
 
From your pictures I think the wall behind is round (I guess that's why you say round stairs)


1. For steps you can make the first step with a cut, then for the others just copy/rotate the first step and change the depth for the cut.


2. As for the lower surface you can sketch the trajectory on a plane tangent to the round wall and then project the curve onto the wall and use itto make a sweep cut to obtain the lower surface.
 
magneplanar,


I guess it's more of a misunderstanding..... I was just wondering more of what one does since it said no vertical lines. I know about the sketch coordinate system. I thought steps might be possible with the graph method.


There a half dozen different ways to do this...


I didn't mean to be insultive if it came out that way , I'm sorry


.I thought that they arebiscuits not cookies :)
 
wsylvester,

no worries mate...just pulling your chain...heh

Because the sweep has a hard time with vertical graph details I doubt a true step would work. Maybe a slight angle? sort of a laid back step haha..

the nice thing about 3d software is that it allows some creativity once you are comfortable with the tools.

Biscuits are on the house...
 
Krede DK, Seems to me like all you want to do is to tidy off the bottom of the stairs (red lines)with a 2d extruded surface??


You can simply sketch the profile that you want to remove (Blue lines) to a dpeth. On the extruded dashboard you will have a few options for depth. For this one you would want either extrude to next which might fail on you with this, or pick theextrude to surface option and select the round surface of the building as a depth.


Hope this helps.


View attachment 3224
 
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