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09-22-2017 05:04 AM

Hello,

I am trying to wrap an rectangle (100mmx10mm) on toroidal surface but I would like to get the same length of the curves after wrapping.

What I have tried:

- "Wrap/Unwrap Curve" - option works only with developable surfaces. In this case it is non-developable surface.
- "Flattening&Forming" - option give the results which are not acceptable (see image bellow)
- "Global Shaping" - option give the best results (see image bellow)

Do you have some other better way to get the results that I expecting?

Also, Is it somehow possible to set startpoint in Global Shaping function, but not as I have defined? *(using formula to make deformed sheet symetric: Shift=CurveLength/2-RectangleLength/2)*

Any help is very appreciated!

Best regards,

Danijel

Solved! Go to Solution.

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7 REPLIES

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09-22-2017 10:18 AM

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09-22-2017 07:48 PM

Hi Ben,

Thank you very much for providing this solution.

I have changed a dimensions of the rectangle to 180x200. Something that I noticed is the difference between the results according to position of the placed XY Origin in Source Plane Definition.

- If I place the origin at midpoint of the line, the results are not acceptable.
- If I place the cursor at the start/end point of the same line the results are better but, one length is 200,0002 which is good but the length of the line at the oposit side is 204.8859, which is still not good.

**For small size geometry object the results are acceptable by using Project Curve option or Global Shaping option. For big size geometry objects I have not found yet a solution.**

Regards,

Danijel

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09-25-2017 09:25 AM

The problem is you are trying to do something that (IMO) there is no "analytic" solution (involving no deformation).

You will need to stretch/deform the curves SOMEHOW.

I don't know if there is a mathematical solution to your problem.

Production:NX10.0.3.5 MP5 + patch/TC11.2

I'd rather be e-steemed than e-diseaseled

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09-25-2017 10:28 AM

I completed a similar study for a customer 3 years ago who was looking for a perfect mapping from a linear surface to a somewhat complex 3D surface. We compared the results of Global Shaping, Project Curve and Metaform, all of which came very close to the original curve lengths. None of them produced an *identical* projection, similar to wrapping a decal.

Regards, Ben

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09-25-2017 12:00 PM

I agree with you. I am not searching for the mathematical solution, I am just trying to test which funcion in NX give the best results in those situation.

P.S. Can someone help me to wrap rectangle 180x200 on the surface in the attached .prt BUT using Global Shaping by Surface option? I have done it by curve (twice because there is a bending in two directions). I have tried by surface but I didn't have success.

Regadrs,

Danijel

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09-25-2017 02:52 PM

See attached. I used the edge lengths of "Revolve (2)" (Length Measurement (3) and Length Measurement (4) to create "Sketch (10)" for "Fill Surface (11)" - assuming no deformation. The new Fill Surface was then used for the Base Surface when creating Global Shaping (12).

Regards, Ben

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09-25-2017 07:31 PM

Hi @BenBroad,

Thank you very much for clear explanation. Now I know how to use "Global Shaping by surface" option.

Regards,

Danijel

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