Spansets - revisited

[Patrick Thompson]

Does anyone have a good version of a 3' and 6' spanset choked around a 2" Tube... 

 

I fell into the nurbs rabbit hole on trying to create my own but I can't ever get it right. 

 

Thoughts?

[VIRTUALENVIRONS]

Are you looking for something like this?  If it works, you can have the model.

 

If not post a picture....bored lately.

 

 

[Patrick Thompson]

I saw you post in the general Discussion and I tried it and failed in spectacular fashion. It should be simple but for some reason I couldnt figure it out..

 

It is 63" From the Bottom of the Pipe to the Bend of the sling. If that makes any sense. 

 

 

Edited May 9 by Patrick Thompson

[VIRTUALENVIRONS]

Hi Patrick,

This is not my area of expertise...if I actually have one.....but it is all black and I can't really make out the detail.  If you can, post another shot more perpendicular to the pipe and I will see what I can do.

 

Perhaps the best thing is to do a tutorial on it.  That was the original plan, but the user disappeared so I never made it.  

 

The model in the video is largely made from standard tools as opposed to NURBS.  Some NURBS tools at the end.

[JustinVanHassel]

@VIRTUALENVIRONSThe sling is a continuous loop of webbing. It is choked around the truss chord the same way you would tie a larks head knot or a girth hitch.

 

https://en.wikipedia.org/wiki/Cow_hitch#:~:text=The cow hitch%2C also called,tied in the same direction.

[Patrick Thompson]

It looks like this... But actually connected.. and a tad bit longer... 

This was an attempt at a 3' Version 

 

 

[VIRTUALENVIRONS]

OK, thanks @JustinVanHassel.  So @Patrick Thompson your version looks pretty good.  I am assuming it was the webbing did not twist when it went behind and then needs to join properly.

Is it something like this but tighter, rounder and the loose ends would join

 

My apologies for my dumbness, but I don't work in this area of truss support, etc.

 

 

[VIRTUALENVIRONS]

Busy weekend putting docks in.  Had some time this afternoon.  Is this something like what you would like? 

 

There are issues with making something like this.  You will notice that when the web comes around the back I have left some space.  When making something like this with NURBS,  the geometry cannot intersect.  So a tight not is problematic.

 

 

 

 

[VIRTUALENVIRONS]

I took a rope and recreated a spanset so I could look at it.  Made more sense after that.  I also looked online and found there were different types, thickness, etc.  

 

I found that the easiest way to make this type of hangar was with B-Rail sweep.

 

 

 

[Patrick Thompson]

Sorry for the delay been pretty busy. Your latest looks good. for my purposes all I really need is the Bottom section around the single pipe. Its basically a girth hitch around the pipe as a fixed peice of webbing around 3' long... 

 

Ill have to dive into what a B rail sweep is. 

 

Thanks

 

 

[VIRTUALENVIRONS]

Hi Pathick,

Would you like this model?  I can probably fix it up as a single go-round.

 

Also,  would a short tutorial on this was made help.

[Mike Wright]

If it's OK I'd love to pull your model apart and look at bi-rail sweeps.  There are so many ways to wrap a truss that it would be great to be able to indicate this on a drawing and being able to draw my own slings would be very useful 

[VIRTUALENVIRONS]

Hi Mike,

Rushing a bit this morning.  This file contains three curves, but for one method only two curves are required.  The short video explains.

 

SPANSET FORUM.vwx

 

 

 

[Patrick Thompson]

A tutorial on the methology would be super helpful. 

 

 

[VIRTUALENVIRONS]

OK, will do that.   Look for it early next week.

[VIRTUALENVIRONS]

@Patrick Thompson  Hi Patrick,  as per your request, see below.

 

There are a number of ways to make a span set depending on its complexity, but I thought this method would be clearer to most.  I hope this helps.