17-Peridot

Question

Any Toroidal Bend experts out there?

Forum|Forum|13 years ago
May 7, 2013
3 replies
11633 views

I'm looking for better explanations of the options in Toroidal Bends.

This seems like a very powerful command but the available text is enigmatic at best.

Some real world examples of how you use this would be appreciated.

From the help files:

About the Toroidal Bend User Interface

The Toroidal Bend tab consists of commands, tabs, and shortcut menus. Click Model ▶ Engineering ▶

Toroidal Bend to open the Toroidal Bend tab.

Commands

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Profile Section collector—Displays an internal sketch or an external section to determine the profile section. The profile section must contain a rotatable geometry coordinate system to indicate the location of the neutral plane. For internal profile sections, you cannot exit Sketcher and continue without creating a valid coordinate system.

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Bend Radius list—Specifies the bend radius of the neutral plane in one of three ways:

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Bend Radius—Sets the distance between the origin of the coordinate system and the bend axis.

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Bend Axis—Lies on the profile section plane.

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360 degrees Bend—Sets a full bend (360°). Specify two planes that define the geometry to bend. The bend radius is the distance between the two planes divided by 2π.

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Bend options collector—When you select a bend radius option, one of the following data collectors appears:

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Bend Radius—Sets the value of the bend radius.

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Bend Axis—Sets an the axis to bend around.

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Bounding Planes—Sets two planes to define the geometry and the length of the bend.

Tabs

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References

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Solid Geometry check box—Sets the toroidal bend functionality to solid bend geometry. Available when the model contains solid geometry.

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Quilts collector—Displays quilts to bend. These can be a combination of any number of quilts within the model.

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Curves collector—Displays all the curves that belong to the bending geometry feature. The bending geometry can include any combination of the following items:

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Solid geometry

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Any number of quilts

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Any number of curve chains

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Connected or disconnected entities

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Profile Section collector—Displays an internal or an external sketch for the profile section.

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Profile Section Unlink—Edits the selected profile section sketch.

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Normals Reference Section check box—Activates the Normals Reference Section collector.

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Normals Reference Section collector—Displays an external sketch as the reference for the normal vector direction of the toroidal bend. When a normals reference section is applied, it references the profile section. Place it as close to the profile section as possible. Avoid the area where the profile section is not tangent or has high curvature. The normals reference section must be long enough for all points in the profile section to have a projection on it. Preferably the two sections either coincide where the curvature is low, or one is an offset of the other. There are two ways to create this dependency:

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Create both sections as external sketch features.

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Create the profile section as an external sketch feature and the normals reference section as an internal sketch of the toroidal bend feature.

To implement a feature containing multiple internal cross-referencing sketches, first create the profiles section and then the normals reference section. The Sketcher setup for the normals reference section is then automatically selected to be the same as the profile section and cannot be modified within the normals reference section sketch.

?

Normals Reference Section Unlink—Activates Sketcher to edit the normals reference section sketch.

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Options

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Curve Bend—Defines the bending options for all curves in the curves collector.

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Standard—Bends the chains according to the standard algorithm for toroidal bends.

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Preserve length in angular direction—Bends curve chains so the distance from points on the curves to the plane of the profile section is maintained along the angular direction.

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Keep flat and contract—Keeps the curve chains flat and in the neutral plane. The distance from points on the curves to the plane of the profile section is shortened. If a second toroidal bend is created with the Preserve length in angular direction option, the result is equivalent to creating a single toroidal bend with the Standard option.

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Keep flat and expand—Keeps the curve chains flat and in the neutral plane. The distance from points on the curves to the plane of the profile section is increased. If a second toroidal bend is created with the Standard option, the result is equivalent to creating a single toroidal bend with the Preserve length in angular direction option.

Note

You can apply the nonstandard options only if the curves to bend lie on the neutral plane.

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Properties

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Name box—Sets a name for a feature.

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—Displays detailed component information in the Creo Parametric browser.

Handles

The Bend Radius handle displays and modifies the bend radius dimensions when the Bend Radius option is selected. Enter a new value into the input panel.

Shortcut Menu

Right-click the graphics window to access shortcut menu commands.

About Toroidal Bends

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General

S

s.iyer

1-Visitor

Have a look at these videoshttp://www.youtube.com/watch?v=6Sy4nTtX-_w

http://www.youtube.com/watch?v=JySjeXP0y78

T

TomD.inPDX

Author

17-Peridot

Interesting, the 1st video is using toroidal bend where a spinal bend would work.

The second video is less clear as to what is being bent in the X direction and is also a spinal bend application. Not sure if there would be a difference.

I was more interested in the subtleties of the command like normals collector and options. There is precious little information (that I can comprehend, anyway) on what these things do and how to properly use them.

The 1st thing I learned is that the section's coordinate system has to face the right way (Y toward the axis).

As an aside, anyone else find that the Warp tool is really bad about goining ends when you think you have a full 360 degree bend?

S

s.iyer

1-Visitor

I have not used this command myself much. This command is typically used to model a Tyre of an automobile, where in you have a bend in both the directions. I never understood how the command works till I studied the videos again and again and tried it out myself.

Here is another link from PTC's Learning Exchange. It does not have an audio, but atleast instructions displayed on the screen.

http://learningexchange.ptc.com/tutorial/2314/create-toroidal-bend-feature

S

sndong-mefane

1-Visitor

Hello,

Can you explain the meaning of " a rotatable geometry coordinate system"? I tried the Tire tutorial, and I cannot get past the sketching step...

T

TomD.inPDX

Author

17-Peridot

You need to use a datum coordinate system in your sketch, not the construction one. X is the -direction- of the rotation axis and +Y points away from the rotation axis.

S

sndong-mefane

1-Visitor

Hello Antonius,

Can you tell me where is the problem in the attached picture?

P

ptc-6399910

1-Visitor

The threads bove aer really impressive and useful. Nut I am facing wierd problem in Toroidal Bend, i.e.; no matter what I do, I am unable to switch the directuion of bend for the toroidal bend. Means I want it to get my features within the "circlular shape" but the feature are on the external part of the bend...