You would think someone on You tube or Rhino would show how to make a spring with helix, No. Not a flat ended one anyway as is reality.
Anyone care to do a video ?.. actually begging …would love to see a video, all would benefit on vimeo or youtube.
How to get the last rotation to progressively lose pitch to end up zero pitch ?
attached my helix and the outer limits of the solid spring, I have tried cageEdit and the tip I get to the end line but the spring just before the tip is still lagging behind and remains beyond the end line limit.
Just how is it done ‘mathematically’ for want of a better term, using rules of geometry in other words, not fudged and fiddled until visually ok. The curve, if you split it, is always tangent to the curve at the split. If I get hold of points and fiddle them at some point in doing so I will end up with a non tangent.
My cageEdit method fails, it was:-
- create helix
- create axis line (the command that draws helix doesnt generate an axis line as such)
- Rebuild command the axis line to 10 points. (degree3)
- Run cageEdit command, select the helix as the captive object.
- Select Control Object is next stage, select the axis, any visible control points vanish, select global, and control points re-appear.
- select one at end and nudge sideways, spring tip moves and spiral adjusts, BUT with spring tip now at end limit the spring is kicking out beyond a bit,
flat ended spring.3dm (57.2 KB)
Outer edge of solid (in .3dm file) means the 0.5inch dia solid touches that.
In fact the spring at end is filed flat down to half its thickness where it extends beyond the limit line . I need to get that recreated.