Jump to content
Posho91

Best way to model a steel tension cable?

Recommended Posts

Posho91

Hi,

I'm familiar with basic solid modelling for walls, roofs etc. but for my project at the moment I have a concrete wall with a number of suspended platforms held up by 45 degree steel tension cables.

I dont know much about curves and pipes and things... :?

 

Do you know the easiest way to model a steel tension cable with some form of connecting eyelet at each end. Preferably the cable should look as though formed from twisted wires rather than a smooth rod.

 

Thanks very much if you can help! :)

Share this post


Link to post
Share on other sites
Jack_O'neill

Something like this perhaps?

 

steel cable.JPG

 

Draw the shape of the end of the cable first. I did it by polar arraying circles so that they overlapped, then trimmed out all but the outer bits to get that "scalloped" shape. Pedit it into a polyline, then sweep it along the a path where you want the cable to be, using a "twist angle". The longer the cable, the more twist you'll need to create the illusion. What you see here was 270° on a random length line approximately 7 inches long.

Share this post


Link to post
Share on other sites
ReMark

How about using a helix? The connector at each end shouldn't be all that difficult.

Share this post


Link to post
Share on other sites
Jack_O'neill
How about using a helix? The connector at each end shouldn't be all that difficult.

 

Connector is nothing. Easy bit that. I tried using helix 2 different ways (see below). The one on the right was created using the shape I described above swept along a helix. The one in the middle was created by sweeping one of the single small circles along a helix, then arraying it around it's self followed by a union. Didn't come out quite right. The one on the far left was created by taking the scalloped shape, copying it every inch and rotating it 18° each time. The 18° is the angle between the center of the "hump" and the bottom of the "valley", and lofting. Still didn't look quite right. It might work, but somebody smarter than me will have to figure it out. Sweep with a twist was the easiest way I could find.

cables.jpg

Share this post


Link to post
Share on other sites
Jack_O'neill

Here's one bent round a corner. This uses a twist angle of 1080, or three full turns. The bigger twist angle you use, the more like a helix it looks.

cable.jpg

Share this post


Link to post
Share on other sites
Jack_O'neill

Here's a loop with a crimp fitting. "I'm through playin' now" as Minnie Pearl used to say.

cable.jpg

 

 

--oops...forgot the grommet. oh well--

Share this post


Link to post
Share on other sites
danellis
--oops...forgot the grommet. oh well--

 

 

Here'ya go' date=' Jack.wallace and grommit beat NASA.jpg

 

dJE

Share this post


Link to post
Share on other sites
Jack_O'neill

:lol::lol::lol::lol:

 

That's great! Thanks!!

Share this post


Link to post
Share on other sites
Posho91

Haha. Thanks jack, sweep and twist seems to work, except that with the size and length of the cables I need autocad is having a hissy fit and crashing whenever I try to manipulate them since it has to recalculate all the twists each time. I think i'll just have to use straight pipes with a texture on them or something :glare:

Share this post


Link to post
Share on other sites
Jack_O'neill
Haha. Thanks jack, sweep and twist seems to work, except that with the size and length of the cables I need autocad is having a hissy fit and crashing whenever I try to manipulate them since it has to recalculate all the twists each time. I think i'll just have to use straight pipes with a texture on them or something :glare:

 

Yeah, it gets pretty intense mathmatically with all those spirals.

Share this post


Link to post
Share on other sites
Posho91

Worked out in the end using the sweep and twist, :) just had to isolate and use 2d wireframe whenever I moved anything so the pc didnt crash. Thanks chaps.

 

Stuctures(2) 2011-05-25 17-52-36.jpg

 

Stuctures(2) 2011-05-25 17-52-55.jpg

Share this post


Link to post
Share on other sites
Jack_O'neill

That's great. Glad you got it to work out.

 

Nice renders!

Share this post


Link to post
Share on other sites
Organic

That looks very nice.

Share this post


Link to post
Share on other sites
Patrick Hughes

Nice work. It looks like you have a clearance issue if the clevis ever needs to pivot up.

Share this post


Link to post
Share on other sites
Posho91

Thanks. Ah yes I see what you mean...well luckily this is a student project and tutors don't tend to pay attention to such things :whistle:

Share this post


Link to post
Share on other sites
Patrick Hughes
Thanks. Ah yes I see what you mean...well luckily this is a student project and tutors don't tend to pay attention to such things :whistle:

 

Well, they need to. :twisted: I dislike the term but it presents a "teachable moment' into the real world, after all isn't that one of the benefits of modeling in 3d?

 

I would perhaps leave it as such and point it out as a "fault".

Share this post


Link to post
Share on other sites
Raudel Solis

hey i had some issues with autocad being slow it never crashed on my hp pavillion dv7 4073nr with a core i7 720qm with 4gb of ram it was just extremely slow at some times but my issues were fixed when i upgraded to the 2012 version of autocad.

Share this post


Link to post
Share on other sites
Jack_O'neill
hey i had some issues with autocad being slow it never crashed on my hp pavillion dv7 4073nr with a core i7 720qm with 4gb of ram it was just extremely slow at some times but my issues were fixed when i upgraded to the 2012 version of autocad.

 

Raudel...uh...did you click on the wrong thread maybe? Don't see what that has to do with this one, and the person you were talking to probably wonders why you didn't answer him.

Share this post


Link to post
Share on other sites
Raudel Solis

pasho91 stated "Haha. Thanks jack, sweep and twist seems to work, except that with the size and length of the cables I need autocad is having a hissy fit and crashing whenever I try to manipulate them since it has to recalculate all the twists each time. I think i'll just have to use straight pipes with a texture on them or something "

 

and "Worked out in the end using the sweep and twist, just had to isolate and use 2d wireframe whenever I moved anything so the pc didnt crash. Thanks chaps."

 

which is evidence that states that there are computer issues possibly on the Autocad side and not the machine which is why i recommended upgrading to Autocad 2012,which might fix the issues.

Share this post


Link to post
Share on other sites
Jack_O'neill

Gotcha...the quote thing really helps out. I had no idea what you meant.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...