drawing spiral stairs in 3d in autocad
Ten
To Create a Screw Stair With User-Specified Settings
AutoCAD Architecture 2018, & AutoCAD MEP 2018
By: 
Assist
Apply this procedure to create a circular sweeping and screw stair. A spiral stair revolves virtually a common middle point from bottom to height.
You lot can specify a radius directly or on the screen just when the arc constraint is complimentary. Otherwise, the radius is adamant from the specified tread length and arc constraint. In that case, you demand to adjust the tread length to achieve the desired radius.
Creating a spiral stair
To create a spiral stair with the specified tread depth (T) that occurs at a specified distance from the inner edge, outset construct the stair with a width equal to twice the required distance (A). Next, employ Customized Edges to showtime the outer edge to the desired full width B. The offset altitude is equal to B - 2A.
Creating a spiral stair with a specified tread depth at a specified distance
Tip: To ensure that the Properties palette is displayed before yous select a tool, click 
Properties.
- Open the tool palette that yous want to use, and select a stair tool.
If necessary, scroll to display the tool that yous desire to use.
Note: Alternatively, click
. 
- On the Properties palette, click the Pattern tab, aggrandize Bones, and aggrandize General.
- Select a mode.
- For Shape, select Screw.
- Specify the horizontal orientation of the stair:
If you want to… Then… describe the screw stair in a counterclockwise direction select Counterclockwise for Horizontal Orientation. depict the spiral stair in a clockwise management select Clockwise for Horizontal Orientation. 
Specifying the horizontal orientation for a spiral stair
- Specify the vertical orientation of the stair:
If you lot want to… Then… draw the stair from this floor to the floor above select Up for Vertical Orientation. depict the stair from this floor to the flooring below select Down for Vertical Orientation. Annotation: If Terminate with is set to Landing, the vertical orientation is up and cannot be inverse.
- Expand Dimensions.
- Specify stair width, tiptop, and justification:
If you want to… Then… specify the width of the stair enter a value for Width. specify the floor-to-floor height of the stair enter a value for Height. specify the justification of the stair enter a value for Justify. The Justify value you select controls the insertion point when you identify the stair (within, center, or outside) at the beginning of the stair run. - Specify the stair termination:
If you want to… Then… stop the stair run with a riser select Riser for Terminate with. 
Note: Stairs that end with a riser will accept an overall height that is one tread thickness less than the floor-to-floor elevation specified.
end the stair run with a tread select Tread for Terminate with. 
end the stair run with a landing select Landing for Terminate with. 
Note: If the vertical orientation is set to Down, Terminate with is set to Riser and cannot be inverse.
- Specify the radius of the stair:
If you lot want to… Then… specify the exact radius for the spiral stair select No for Specify On Screen and enter a value for Radius. ascertain the radius for the stair dynamically select Yes for Specify On Screen. - Select the blazon of arc constraint to use when creating the spiral stair:
If you want to… Then… create a spiral stair run with no constraints select Complimentary for Arc constraint. create a spiral stair with a specific number of degrees for the stair flight select Total degrees for Arc constraint, and enter a value for Arc angle. This includes the terminal landing or tread. create a screw stair with a specific caste for each tread in the stair select Degrees per tread for Arc constraint, and enter a value for Arc angle. - Click
next to Calculation rules, and if you want to… then… specify the overall linear length of the stair enter values for Direct Length and Riser Count, then click OK. - When Directly Length is set to
(automatic), the value is calculated based on the tread size and riser count. - When Straight Length is set to
(user-divers), the stair length is equal to the dimension entered, and the other three values are adjusted within the code limits. - When Riser Count is set to (user-defined), the tread depth is increased or decreased to accommodate the stair.
specify the total number of stair risers enter a value for Riser Count, and so click OK. - When Riser Count is fix to (automated), the number of risers is based on the overall length and overall peak of the stair and the code limits specified on the Design Rules tab. The Straight Length value of the stair is adapted automatically.
- When Riser Count is set to (user-defined), you tin specify a value that is used to summate the tread depth and riser pinnacle. If these values fall outside the stair limits, an error message is displayed.
specify the elevation of each riser in the stair flight set all fields to (automatic), click the icon for Riser to change it to (user-divers), and enter a value for Riser. Click OK. specify the tread depth for each tread in the stair flying set all fields to (automatic), click the icon side by side to Tread to modify information technology to (user-defined), and enter a value for Tread. Yous can too specify the Riser count when you prepare the tread depth. Click OK. Notation: If a value is set to user-defined on the Calculation rules worksheet, it can exist modified direct in the Properties palette.
Note: If
is displayed side by side to a field in the Calculation Rules dialog box, that field can't exist changed until some other field is changed from (user-divers) to (automatic). - When Directly Length is set to
- Expand Advanced.
- Specify the Floor Settings:
If you want to… Then… change the thickness of the floor finish material at the top of the stair enter a value for Top offset. change the depth of the structure at the peak of the stair enter a value for Pinnacle depth. modify the thickness of the flooring end textile at the lesser of the stair enter a value for Lesser offset. - Set the minimum acme or amount of risers in a stair flight, or specify *NONE*.
- Set the maximum height or number of risers in a stair flight, or specify *NONE*.
- Specify the eye betoken for the spiral stair.
- Specify the location of the stair.
- Continue adding stairs, or press Enter.
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Source: https://knowledge.autodesk.com/support/autocad-architecture/learn-explore/caas/CloudHelp/cloudhelp/2018/ENU/AutoCAD-Architecture/files/GUID-DE51B26D-48B2-40C3-9E81-6BDE3DD0605A-htm.html
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