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JDMather
Posts: 26,301
Registered: ‎04-20-2006
Message 11 of 20 (828 Views)

Re: Spiral stair..

04-26-2012 07:08 AM in reply to: Secttor

Secttor wrote:

Sounds easy but I need 100% compatibility (further edit) with AutoCAD product..


I don't understand how using Frame Generator changes anything relative to AutoCAD?

Also, I would probably try to simplify a bit (see attach) to make edits easier.

 

and I noticed that a couple of your sketches were not constrained.

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Secttor
Posts: 89
Registered: ‎03-01-2012
Message 12 of 20 (812 Views)

Re: Spiral stair..

04-26-2012 09:31 AM in reply to: JDMather

But is there any explanation for this angle that increases as more as I sweep ?

 

Capture.JPG

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trumpy81
Posts: 317
Registered: ‎10-22-2006
Message 13 of 20 (802 Views)

Re: Spiral stair..

04-26-2012 10:37 AM in reply to: Secttor

The angle is caused by the sweep. It is correctly using a mitre at the 90deg corner, but this mitre is causing the twist or angle that you see.

 

To avoid that, you will need to treat each 'level' as a seperate sweep. You will also need to redraw the profile sketch for each level.

Regards
Andy M
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PaulMunford
Posts: 898
Registered: ‎11-13-2006
Message 14 of 20 (782 Views)

Re: Spiral stair..

04-26-2012 11:33 PM in reply to: trumpy81

...Or use a sketch block for each profile...

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Martin_Goodland
Posts: 302
Registered: ‎07-15-2005
Message 15 of 20 (769 Views)

Re: Spiral stair..

04-27-2012 06:04 AM in reply to: Secttor

The sweep is rotating the box because this is the angle that the box needs to be to produce the correct miter cut for the box faces to match. If you want the handrail to run as you have drawn it you will have to fudge the miters as the faces will not line up properly when the handrail is horizontal.

 

If you want to use a mitered rectangle, I would set the handrail break point onto the quarter landing higher than you have it at the moment so there is a horizontal flat portion either side of the miter. This will then sweep correctly giving you the detail you need, or just use a round tube instead.

 

Regards

 

Martin


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JDMather
Posts: 26,301
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Message 16 of 20 (760 Views)

Re: Spiral stair..

04-27-2012 07:09 AM in reply to: Martin_Goodland

Martin_Goodland wrote:

If you want the handrail to run as you have drawn it you will have to fudge the miters



But if you do it correctly (using Frame Generator or copied Sketch Blocks) as suggested and then cut your miters - no fudging required - just a bit of work.  If you do this a lot - the Frame Generator is the way to go (or even for a one-off if you know how to add custom profiles to the Frame Generator). Otherwise copy your Sketch Block and Multiple Sweep and Sculpt or Split to trim the ends (create multibody solids).  Then push out the solids if needed.

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Martin_Goodland
Posts: 302
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Message 17 of 20 (751 Views)

Re: Spiral stair..

04-27-2012 08:03 AM in reply to: JDMather

Hi JD

 

Have to disagree. In the attached image showing the miter done using frame generator you can clearly see the issue I tried to explain in my previous e-mail. The faces of the miter do not align because of the geometry used on the stair. The 'Fudge' is that to make this into a suitable handrail joint you would need to weld and blend it to make it look neat (and it will still look odd in my opinion). If you use a round tube it will work but for any other shape you should only change direction in one plane at a time to avoid this.

 

Regards

 

Martin

 

 

 


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JDMather
Posts: 26,301
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Message 18 of 20 (739 Views)

Re: Spiral stair..

04-27-2012 08:11 AM in reply to: Martin_Goodland

Martin_Goodland wrote:

... you can clearly see the issue I tried to explain in my previous e-mail. 

 


I didn't take the time to try it.  Points out the hand blending required in the field.
In any case - I think it will requre multiple sweeps (and multiple parts out in the field) where I think the op is expecting a single sweep.

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Martin_Goodland
Posts: 302
Registered: ‎07-15-2005
Message 19 of 20 (728 Views)

Re: Spiral stair..

04-27-2012 08:34 AM in reply to: JDMather

 


I didn't take the time to try it.  Points out the hand blending required in the field.
In any case - I think it will require multiple sweeps (and multiple parts out in the field) where I think the op is expecting a single sweep.



I though that was the case which is why I posted the example. I did not want the OP to go off and try re-working the detail in Frame generator or with sketch blocks as advised when the issue is the handrail geometry being used.

 

Personally I always use the approach of sweeping a rail as a single part. It highlights geometry issues, like this one, and allows them to be easily fixed. Once the geometry is locked down and approved I would break the rail out as needed for a particular job. Powder coated items are usually fully modeled but for a polished handrail often the single swept part with some joint locations is enough for the shop to fabricate from.

 

Regards

 

Martin


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GlennChun
Posts: 115
Registered: ‎06-10-2004
Message 20 of 20 (671 Views)

Re: Spiral stair..

05-01-2012 11:08 PM in reply to: Secttor

Secttor wrote:

But is there any explanation for this angle that increases as more as I sweep ?


Hello Secttor,

 

As Martin_Goodland already answered, the profile rotates to produce the correct miter cut for sweep faces to match.  The following figure shows how the miter plane is determined between Sketch2 and Sketch3.

 

handrail_miter_plane_iso.png

 

As you can see, all faces along Sketch2 perfectly match to all faces along Sketch3 at the miter plane.  The top face along Sketch2 is straight up, but the top face along Sketch3 is rotated toward the center of the entire stairs because of the orientation of the miter plane.  This top view can help you visualize better:

 

handrail_miter_plane_top.png

 

As Martin_Goodland mentioned, the profile rotations would not cause any orientation issue for the handrail if a circular profile is swept:

 

handrail_circle.png

 

If the profile is a square or a round square as shown below, adding a vertical line at the start of each 'level' would resolve the orientation issue for the handrail.  A single sweep can make the following model with all top faces 'up'.

 

handrail_round_square.png

 

HTH,

Glenn

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