Barley Twist Spirals
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@pbacot said:
screw.rb can make this pretty well and fast. But I bet the geometry created by Dave's method would be nicer.
There is no reason, it depends of how many steps you type in the prompt window.
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Made in one shot with screw1_5.rb.
AND it works also with components.
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Gilles, yours shows a nice spiral or screw but that's not a barley twist. The barley twist consists of multiple starts. It is possible to make the barley twist with Screw, though.
This is a three-start barley twist. -
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Sorry Dave, there are two starts and I could have done n starts in one shot.
OFF TOPIC
components plus profiles in one shot:
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Pilou, you trot that video out every time someone asks how to draw anything.
That's not a barley twist either.
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@gilles said:
Sorry Dave, there are two starts and I could have done n starts in one shot.
Show the setup. And which version of Screw are you using.
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screw1_5.rb.
select 3 profiles (in the following case), set start point, set end point, enter n steps n turn and go.
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Thanks. that should help the OP.
Isn't it great there are usually multiple ways to arrive at the same point in SketchUp?
And you finally drew a barley twist.
Here's a cutter profile for that.
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@dave r said:
Pilou, you trot that video out every time someone asks how to draw anything.
That's not a barley twist either.
True but otherwise a brilliant solution!
(I could imagine Kito Raupp is Pilou himself in a humble disguise)
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Here is a step by step.
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@gilles said:
Made in one shot with screw1_5.rb.
AND it works also with components.
This is what we call a rope twist not a barley twist. The barley twist has another (interior) radius. The rope twist looks like rope - though your method may work for a barley twist as well. David R's is definitely a barley
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Dave R
Love your solution but I need to fit it to the other part of my newel. Gilles method looks like it will work. In CAD I'll usually do a sweep of the newel profile then draw my barley twist profile - sweep the barley profile with the correct pitch then subtract it from my newel sweep. I wish I could do it this way (specifically the subtract function) in SU since this yields the most realistic geometry - though again Gilles looks pretty right (just needs more interior radius to be classified as a true barley twist). Thanks -
Its up to you to create the good profile.
You can also do this with screw:
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archturn, you could use the method I showed and create the transitions when you've finished. There isn't any reason you couldn't fit it to the rest of the turning. I did on the table legs. The transitions are similar to creating the pommels which I've showed in several other blog posts so I didn't bother with them in that one. The Screw plugin is nice, too. although you can do multiple starts the way Gilles shows, I would still make a single turn as a component and copy it as I did in the blog to keep file size down and make it easier to adjust the length.
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@dave r said:
archturn, you could use the method I showed and create the transitions when you've finished. There isn't any reason you couldn't fit it to the rest of the turning. I did on the table legs. The transitions are similar to creating the pommels which I've showed in several other blog posts so I didn't bother with them in that one. The Screw plugin is nice, too. although you can do multiple starts the way Gilles shows, I would still make a single turn as a component and copy it as I did in the blog to keep file size down and make it easier to adjust the length.
Totally agree with this.
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Hi,
here are two more options
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I can see that I should have been visiting the forum more frequently instead of pulling my hair out. Awesome!!!
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Yes. You should have.
And as I wrote before, there's more than one way to arrive at the final result in SketchUp. This is a great example.
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