spiral staircase (going mad!!)
spiral staircase (going mad!!)
(OP)
hello people,
i have to draw this spiral staircase in AutoCAD but its pretty messy even on the architect manual: looks like every method i apply is wrong! (since i have to check a certain distance on a certain point and its not matching)
so im NOT asking about blocks and stuff, just if u know some page/site/link or w/e comes to your mind that may help, some scheme...i dont know...showing how to geometrically construct the staircase.
i underline that the spiral staircase with all the steps aiming to the center of the middle pillar its not my case.
thanx in advance
i have to draw this spiral staircase in AutoCAD but its pretty messy even on the architect manual: looks like every method i apply is wrong! (since i have to check a certain distance on a certain point and its not matching)
so im NOT asking about blocks and stuff, just if u know some page/site/link or w/e comes to your mind that may help, some scheme...i dont know...showing how to geometrically construct the staircase.
i underline that the spiral staircase with all the steps aiming to the center of the middle pillar its not my case.
thanx in advance





RE: spiral staircase (going mad!!)
Obviously, you'll have to calculate the pitch; the amount of center post that each tread will need and even make it a little longer than the calculated value since when you UNION the excess will be incorporated in to the center post.
The tricky part will be to draw the circular handrail; so draw it a little longer for one tread in the X-Y plane as a solid and rotate it about its lower end in the X-Z or Y-Z plane a calculated angular value.
RE: spiral staircase (going mad!!)
Once the ellipse is drawn in the x-y plane only take a portion lining perpendicular to a typical tread whose center will line up to the minor diameter of the above ellipse; then rotate that portion of the ellipse about the center of the ellipse a value of the lead angle. make sure the portion of the ellipse you select to rotate is sufficient to union with other arrayed tread as mentioned in the previous post.
A little complicated and if you are not familiar with the math mentioned above get help from an engineer. Once you complete this project, the experience will be gratifying.
RE: spiral staircase (going mad!!)
Then when you copy/array this tread, do the same with the point. Then, when you are done you will have all the treads and a series of points 42" above each stair. Put a spline through the points to get a path for the handrail.
-- MechEng2005
RE: spiral staircase (going mad!!)
RE: spiral staircase (going mad!!)
RE: spiral staircase (going mad!!)
same concept?
RE: spiral staircase (going mad!!)
In Autocad use the Helix command and draw 1 revolution, diameter x Height.
Then use list and it will give you all the information you need.
If you want a 3d model of the handrail, rotate the UCS and put it on the end point and draw a circle, explode the Helix just once, then extrude the circle and pick the Helix as the path. This will only work with a circle any other shape will twist as it goes around the Helix.
As for the fabricator all he needs to know is the diameter, height and length.
Its a bit of hit and miss getting the first one right, the tube has to be rolled and twisted at the same time, not a easy job,
Best of luck.
I hope this helps.
Regards
Dave
RE: spiral staircase (going mad!!)