Rope geometry ???

[Neal Z]

Any ideas on how you would develope geometry of a

rope. I would like to do it with solids. Something with 3 diameters that twist about themselves. I don't have access to the ftp site.

[camguy]

Neal, I emailed you a file

[Diablo God]

I dont know about the swirl in the rope, but if you are trying to get a round shape to interweve like a rope. You can create circles through out where you want the rope to be. And loft em through. The hard part is to keep its orientation. So what I do, is create a circle, break it by mid point 3 time. So you have one half, and 2 quarters of a circle. Now change it into 3 colors, so you always no where the proper start point is of the circle. Helps with chaining the right direction as it interweves.

 

Jim

[John Summers]

Look at ROPE.ZIP in the MC9 folder. Rope axis is on Z. You can map it to another view.

[Dan_AKA_ROY]

Neal, do you have a solid modeler or Rhino? Ropes can be done in a snap.

 

I have Rhino here at work. Using the pipe extrude you can get that rope geo. then wrap around the pipe extrude using a spiral. create a smaller diameter for the spiral [also using pipe extrude]. using NPower [a rhino add on solid modeler] you can boolean remove to get that "rope look"

 

You can do it in MC, just takes alot more time.

[Teh Bear without Brains kinda idiot]

I used to use together with other things

fplot.dll C-hook

See this and this thread for additional info

 

HTH

WTHH

[Neal Z]

Will that c-hook allow me to make a circular helix? Thanks for all the input.

[Teh Bear without Brains kinda idiot]

~~~~~~~~~~~~~~~~

Will that c-hook allow me to make a circular helix?

~~~~~~~~~~~~~~~~

yESS!

Also you can use ,IMHO,Create->next menu->spiral/helix command (but only with constant pitch )

With fplot you are unlimitied !

HTH

WTHH

[Neal Z]

Ok. I'm way in over my head. Can you give me an example? Something that twists around a given dia.

[Teh Bear without Brains kinda idiot]

I give you 2 examples

example #1 :Constant radius variable pitch

Save it with an *.EQN extention and put in C-hooks directory to run with fplot.dll C-hook

 

 

quote:

--------------------------------------------------------------------------------

step_var1 = t1

step_size1 = 0.5

lower_limit1 =0.5

upper_limit1 = 40

geometry = spline

angles = radians

origin = 0, 0, 0

r=30

h= 6.28319/10

x = r * cos(t1)

y = r*sin(t1)

z = (-1* (t1/h))-1.05^(t1/0.5)

 

--------------------------------------------------------------------------------

 

example #2 :variable pitch and radius

Save it with an *.EQN extention and put in C-hooks directory to run with fplot.dll C-hook

 

quote:

--------------------------------------------------------------------------------

 

step_var1 = t1

step_size1 = 0.5

lower_limit1 =0.5

upper_limit1 = 40

geometry = spline

angles = radians

origin = 0, 0, 0

r=30

h= 6.28319/10

x = r *(0.952^(t1/0.5))* cos(t1)

y = r*(0.952^(t1/0.5))*sin(t1)

z = (-1* (t1/h))-1.05^(t1/0.5)

 

HTH

[John Summers]

Neal,

Did you manage to unzip ROPE.ZIP, and look at ROPE.MC9? The little 'post' that went along with it, GENHELIX.PST, generates a helix of a given pitch thru each point in the toolpath. Furthermore, the points don't have to be in any particular plane.

[Neal Z]

John, I do have access to the Ftp site, sorry. Still working on it. Trying to generate circular helix that is what I need. Working with what Winnie teh Pooh gave me.

[Neal Z]

John, I don't(sp) have access to the Ftp site, sorry.

[John Summers]

If you e-mail me, I'll send it to you directly. I use -.PST files more than FPLOT, because you have more control over subroutine calls (p-lines), and you can have a multiple-point input (the -.NCI file or a 'buffer' (-.TXn) file. Click on my name to get the e-mail address.

[Neal Z]

I want to take this opportunity to thank all those who helped me with this project, especially John from CNC software. Without this forum, I wouldn't be able to do this job. This forum is awesome. Thanks