CAD Forum discussion (EN) : Modeling a Twisted Ribbon

CAD Forum discussion (EN) : Modeling a Twisted Ribbon https://www.cadforum.cz/forum_en/ Fri, 15 May 2026 16:46:35 +0000 Fri, 19 Oct 2018 14:20:23 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://www.cadforum.cz/forum_en/RSS_post_feed.asp?TID=12958 <![CDATA[CAD Forum discussion (EN)]]> https://www.cadforum.cz/forum_en/forum_images/web_wiz_forums.png https://www.cadforum.cz/forum_en/ <![CDATA[Modeling a Twisted Ribbon : After a load of errors ..........]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36484&title=modeling-a-twisted-ribbon#36484 Author: rebellio
Subject: 12958
Posted: 19.Oct.2018 at 14:20

After a load of errors ....... if i use a bigger diameter on the helix, errors keep popping up. But for now i am glad with the result. Cool

]]> Fri, 19 Oct 2018 14:20:23 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36484&title=modeling-a-twisted-ribbon#36484 <![CDATA[Modeling a Twisted Ribbon : Hello Seant and all the others,...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36483&title=modeling-a-twisted-ribbon#36483 Author: philippe JOSEPH
Subject: 12958
Posted: 19.Oct.2018 at 13:34

Hello Seant and all the others, if we see Arunvigneshram again and if he could give us the dimensions of the ribbon section, the total length of a rotation of 180 degrees + the dimensions of the nothes we could verify our various solids.

If it's just an image our solids are very good mainly because I wouldn't have thougt it could be possible to modelize this twisted ribbon without facets, thanks again Arunvigneshram !!!

Edited by philippe JOSEPH - 19.Oct.2018 at 13:38]]> Fri, 19 Oct 2018 13:34:48 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36483&title=modeling-a-twisted-ribbon#36483 <![CDATA[Modeling a Twisted Ribbon : thanks for your reply but unfortunately...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36481&title=modeling-a-twisted-ribbon#36481 Author: rebellio
Subject: 12958
Posted: 19.Oct.2018 at 12:51

thanks for your reply but unfortunately that does not help.]]> Fri, 19 Oct 2018 12:51:39 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36481&title=modeling-a-twisted-ribbon#36481 <![CDATA[Modeling a Twisted Ribbon : I don't know what that error...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36480&title=modeling-a-twisted-ribbon#36480 Author: SEANT
Subject: 12958
Posted: 19.Oct.2018 at 12:30

I don't know what that error code means. Try something, though; move the blue coil up just a bit then subtract. ]]> Fri, 19 Oct 2018 12:30:09 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36480&title=modeling-a-twisted-ribbon#36480 <![CDATA[Modeling a Twisted Ribbon : Hi, great post and challenge ,...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36478&title=modeling-a-twisted-ribbon#36478 Author: rebellio
Subject: 12958
Posted: 19.Oct.2018 at 11:18

Hi, great post and challenge Clap

, i almost had it but i receive an error on the last substract action............

Any ideas ? Error Code Number is 84028.......

]]> Fri, 19 Oct 2018 11:18:18 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36478&title=modeling-a-twisted-ribbon#36478 <![CDATA[Modeling a Twisted Ribbon : I’m not sure what level of precision...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36477&title=modeling-a-twisted-ribbon#36477 Author: SEANT
Subject: 12958
Posted: 19.Oct.2018 at 08:48

I’m not sure what level of precision the OP implied; conceivably the intention was for a demonstrational level or, maybe, to prep Rapid Prototyping. Be that as it may, I tried to prep a model to as high a degree of accuracy as I could manage.

An initial quandary was the notion of constant thickness. Sweeping a Rectangle keeps a constant Cross Section thickness, but the thickness perpendicular to the face varies through the radius. See illustration in TwistRibbnConstThick_1.

Now, Elastic/Plastic deformation of a twisted ribbon may thin a material to some extent. For my presentation, though, I’m going to stick with a constant thickness.

Another area that needed addressing was the final diameter. I could keep that very constant by using some of the early construction geometry to slice an explicitly sized cylinder.

And a final area of concern was the notching. Conceivably, the notch should have walls perpendicular to the spiral face. That face changes Ramp angle through it’s radius, then so too should the notch. See model in TwistRibbnConstThick_2.

I have to assume I've made the process way more complicated than necessary. The process is interesting, though. High tolerance fabrication brings additional sets of concern to an AutoCAD modeler.

]]> Fri, 19 Oct 2018 08:48:11 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36477&title=modeling-a-twisted-ribbon#36477 <![CDATA[Modeling a Twisted Ribbon : I suppose keeping a mind towards...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36469&title=modeling-a-twisted-ribbon#36469 Author: SEANT
Subject: 12958
Posted: 18.Oct.2018 at 10:09

I suppose keeping a mind towards accuracy requires hard parameters. The OP (Arunvigneshram) had a picture, and a description of a strip of metal inserted into a pipe. A new tutorial should make use of philippe's dimensions - a 20 mm inside diameter pipe @ 180 mm long with a .2 mm thick strip with one twist.

I'll see what I can do.

Edited by SEANT - 18.Oct.2018 at 10:17]]> Thu, 18 Oct 2018 10:09:58 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36469&title=modeling-a-twisted-ribbon#36469 <![CDATA[Modeling a Twisted Ribbon : Kent Cooper wrote: philippe...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36468&title=modeling-a-twisted-ribbon#36468 Author: SEANT
Subject: 12958
Posted: 18.Oct.2018 at 09:58

Kent Cooper wrote:

philippe JOSEPH wrote:

...

I suppose that THICKEN is what Kent what waiting for or his next step.

Yes, it is [a newer command than the version of AutoCAD I used for years, so I wasn't aware of it]. BUT if the small difference matters, THICKEN goes only one way from a Surface, with no center-the-thickness option -- it's not like giving a Polyline width [which is centered]. So if the thickness of the ribbon needs to be centered across the zero-thickness twisting Surface, I think it's necessary to LOFT from one Helix to the other, and also LOFT in the other order [from the other to the one], and THICKEN both of the Surfaces by half the desired total thickness, then UNION the two Solid results together [and Erase the Surfaces if you like, if DELOBJ wasn't set to do that in the process of Thickening].

Good point. If I do find the time to create a version of a tutorial, I'll keep accuracy in mind.

]]> Thu, 18 Oct 2018 09:58:50 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36468&title=modeling-a-twisted-ribbon#36468 <![CDATA[Modeling a Twisted Ribbon : Very nice model, and excellent...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36467&title=modeling-a-twisted-ribbon#36467 Author: SEANT
Subject: 12958
Posted: 18.Oct.2018 at 09:53

Very nice model, and excellent tutorial.

I see now that your earlier request to me was an opportunity/offer to create the tutorial. This may be a little late but, Thank you.

I'll see if some time presents itself - perhaps I can put something together that has something new to offer.

]]> Thu, 18 Oct 2018 09:53:09 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36467&title=modeling-a-twisted-ribbon#36467 <![CDATA[Modeling a Twisted Ribbon : I have placed my AutoCAD file...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36465&title=modeling-a-twisted-ribbon#36465 Author: philippe JOSEPH
Subject: 12958
Posted: 17.Oct.2018 at 07:13

I have placed my AutoCAD file : Modeling a Twisted Ribbon-01.dwg here in the CAD/BIM Blocks library.]]> Wed, 17 Oct 2018 07:13:34 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12958&PID=36465&title=modeling-a-twisted-ribbon#36465