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Say, why not to use a "Torus" tool from Solids toolbar to do that? Or draw a
cross section of the desired handrail/spring and
use Revolve-->Slice-->Rotate-->Array-->Union set of commands? The only setback
in all of these techniques is that the final
"spiral" is not helical one. But for most of the cases it is good enough.
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"Dan S." wrote:
<br>> Such as a coil spring or a handrail for a spiral staircase.
<br>> I have tried solids and surfaces but nothing works.
<br>> Any help would be appreciated.
<p>Rich, There is a way to do this in cad. Now, i havn't done this in a
<br>while, but i can give you the basic concept. (for what its worth)
<p>Fist off, create a circle at the desired radius/dia, use the trim
<br>command to cut the circle in half.
<br>now you need to rotate the ucs so that the Y axis is in the direction
<br>of the former Z direction. Figure out the slope or angle in which
<br>spiral will accending. now rotate the half-circle so that it is angled
<br>upward at the desired slope. now copy, and rotate the half-circle 180d
<br>(using the original ucs) use osnaps to connect the two halves. (so
<br>that they form a spiral)
<br>once you have gotten the spiral at the approprite height and angle,
<br>you need to change the ucs once again so that one of the endpoints
<br>(top or bottom) is perpendicular with the ucs. after that all you need
<br>to do is join all the line segments to creat one line. Create the
<br>shape that the actual handrail "grip" looks like, and make it into
<br>region. Once it's a region, it's just a matter of extruding the shape
<br>along a path, which would be the spiral.
<p>I hope this helped a little more than telling you to buy new software.