1-Visitor

Question

How can I create a Möbius Strip?

Forum|Forum|14 years ago
February 6, 2012
8 replies
15186 views

I'm really struggling with this issue. Does anyone know how to create a nice, visually pleasing möbius strip in Creo Schools addition? Here is what I really want the model to look like: http://sketchup.google.com/3dwarehouse/details?mid=316a27ba42a11a71abdffc6614cbf81a&prevstart=0 (the model is done in skechup, free from Google, if you are wondering about how to open .skp.

I need all the help I can get, thank you.

V

VladimirN

24-Ruby III

Some mobius strip/gear models at GrabCAD site: http://grabcad.com/library/tag/mobius

M

MikeFitch

1-Visitor

Off hand, I think you could do it with a swept blend on a circular trajectory. Just start and end with a square and move the start point to create the 'twist'.

* You may have to do it in two semicircular sections.

Patriot_1776

22-Sapphire II

Variable section sweep would be what I'd use. It would make sure the strip length would remain constant, something that would be tough to do with a swept blend.

Of note, I think I came up with a "new" type, and am looking into whether there is a aplce to submit my model t see if it meets the qualifications. I BELIEVE it does, as I've made a paper model, but we'll see.

K

KevinBradberry

1-Visitor

In case Lucas needs a bit more info:

Make a variable section sweep using a circle as the trajectory.
Use a rectangle as the shape of the section (or someting more creative after you try this).
- Allow there to be an angular dimension that will allow the rectangle to rotate.
- The section should only be constrained to itself. Meaning no dimensions to an axis line (other than the angular dimension) or perpendicular constraints to the axis lines, etc.
While inside sketcher, create a relation (Tools>Relations) such as sd16=360*trajpar*1. Substitute sd16 with your angular dimension's alias. The 1 after trajpar can be increased to add rotations.

I hope this works for you, let us know.

-Kevin

Patriot_1776

22-Sapphire II

Why a rectangle? A mobius "strip" is just that, a surface. Also, only odd increments of 1/2 turns (180deg) make a Mobius Strip (i.e.: 180deg, 540deg, etc.).

K

KevinBradberry

1-Visitor

Lucas,

By the way, I do not know the definition for Mobius Strip, I only saw a picture. If what Frank says is correct, then adjust accordingly.

Regards,
Kevin

M

MikeFitch

1-Visitor

This was done using two swept blends, though I think Frank's solution is probably more elegant.

http://dl.dropbox.com/u/11404499/prt0001.prt.2

Good luck!

Patriot_1776

22-Sapphire II

Interesting....

1_mobius_strip-02-stp.zip

K

KevinBradberry

1-Visitor

Well...?

How about a .prt file so it can be interesting to others .

Patriot_1776

22-Sapphire II

Ahhh, that's the rub. I'm going to try it one more time without a technique I developed, and if so, I'll post it. If it can't be created any other way, I'll have to save it for my future business in teaching Pro/E.

....and besides, it's still interesting.

B

buddyer

1-Visitor

Patriot_1776

22-Sapphire II

Buddy, it looks to me like there's a full 360deg rotation there. If so, it's not actually a Mobius. I true Mobius only does a half twist per revolution, or odd increments of half twists. Can you attach a STEP file please?

Thx.