|Part Design → Create an additive feature → Additive pipe|
|Introduced in version|
|PartDesign AdditiveLoft, PartDesign SubtractivePipe|
Additive Pipe creates a solid in the active Body by sweeping one or more sketches (also referred to as cross-sections) along an open or closed path. If the Body already contains features, the additive pipe will be merged to them.
On the left: cross-sections (A) and (B) to be swept along path (C); resulting Additive pipe on the right.
The example image above shows two different cross-section shapes. The text below will describe the procedure with a single shape only. This will achieve a part with the same cross-section along the whole path.
- Create two separate sketches;
- one for the path, e.g two lines connected by a curve as in the image above,
- one for the cross-section shape, e.g. a circle as the first shape in the image above. Instead of a sketch also the face of a 3D object can be used. (introduced in version 0.20)
- Arrange the two shapes in 3D correctly. It is recommended to place the origin of the cross-section onto the line of the path. The two sketches should in most cases be orthogonal. This can be done with the 'Map Mode' function (make both sketches visible with . Select the cross-section sketch. Select Properties/DataTab/MapMode. Click the appearing button at the right side. In the Attachment Dialog select a vertex of the path sketch and select the correct mode to get the two sketches aligned correctly).
- Press the button.
- In the Select feature dialog select a sketch to be used cross-section and click
- Alternatively, a sketch or a face of a 3D object (introduced in version 0.20) can be selected prior to pressing the Additive pipe button. In that case you will not get a "Select feature' dialog.
- In the Pipe parameters under Path to sweep along, press the button.
- Select the sketch to be used as path in the 3D view. In this case the whole sketch will be used as path.
- Alternatively, single edges of the sketch can be selected by pressing and selecting edges in the 3D view. Note that you must press the for each edge again. You must select a continous line with no branches.
- The other settings should work with the default settings in most cases.
- Click .
To use more than one cross-section, start with the first cross-section sketch as described above. Then under Section transformation set the Transform mode to Multisection; press 3D view. Repeat for each additional cross-section.then select a sketch in the
- Select Constant to use a single profile
- Select Multisection to use multiple profiles
- This keeps the cross section shape perpendicular to the path. This is the default setting.
- Orientation set by first profile and constant throughout. This deactivates the alignment to the path normal vector. That means that the cross-section shape will not rotate with the path. Sweep along a circle to see the effect.
- Create minimum possible twisting of profile. For more info, see Frenet-Serret Formulas
- Specify secondary path to guide pipe.
- For each point P along the sweep path, there will be a corresponding point Q on the auxiliary path.
- As the profile is swept, it will be transformed such that the PQ line is the normal of the sweep path.
- If Curvilinear is set, then the Q points are scaled proportionally along the sweep path, regardless of it's length.
- Specify binormal vector in X, Y and Z
- DataLabel: name given to the operation, this name can be changed at convenience.
- DataRefine: true or false. If set to true, cleans the solid from residual edges left by features. See Part RefineShape for more details.
- DataSections: lists the sections used.
- DataSpine Tangent: true or false (default). True extends the path to include tangent edges.
- DataAuxiliary Spine Tangent: true or false (default). True extends the auxiliary path to include tangent edges.
- DataAuxiliary Curvelinear: true or false (default). True calculates normal between equidistant points on both spines.
- DataMode: profile mode. See Options.
- DataBinormal: binormal vector for corresponding orientation mode.
- DataTransition: transition mode. Options are Transformed, Right Corner or Round Corner.
- DataTransformation: Constant uses a single cross-section. Multisection uses two or more cross-sections. Linear, S-shape and Interpolation are currently not functional.
- To better control the shape of the pipe, it is recommended that all cross-sections have the same number of segments. For example, for a pipe between a rectangle and a circle, the circle should be broken down into 4 connected arcs.
- You can pipe from or toward a single vertex from a sketch or the body. introduced in version 0.20
- When you select a vertex as section, it must be the last section of the pipe. Otherwise the pipe body would consist of two solids connected at a single point. This would violates the CAD kernel's definition of a 3D object. You can change the order of the sections by dragging them in the list.
- The path can only be from a single sketch, feature or ShapeBinder. In case you want to sweep along several edges from different sketches, use a .
- The path must not contain branches or T-junctions etc. Loops are allowed.
- It can lead to issues if the cross-section is not perpendicular to the path in 3D.
- A cross-section cannot lie on the same plane as the one immediately preceding it.
- The cross-sections must not contain disjoint or crossing loops.