PartDesign SubtractivePipe

Description
Subtractive Pipe creates a subtractive solid in the active Body by sweeping one or more sketches (also referred to as cross-sections) along an open or closed path. Its shape is then subtracted from the existing solid. SubtractivePipe is often used in connection with Part Helix and PartDesign ShapeBinder to create a thread; see the Thread for Screw Tutorial for details.

Usage

 * 1) Press the  button.
 * 2) In the Select feature dialog, select a sketch to be used as first cross-section and click.
 * 3) * Alternatively, a sketch or a face of a 3D object can be selected prior to pressing the Subtractive pipe button.
 * 4) In the Pipe parameters under Profile, press the  button.
 * 5) Select the sketch to be used as path in the 3D view:
 * 6) * Alternatively, edges of the body can be selected by pressing and selecting edges in the 3D view.
 * 7) To use more than one cross-section, under Section transformation set the Transform mode to Multisection; press  then select a sketch in the 3D view. Repeat for each additional cross-section.
 * 8) Set options if needed and click.

Options
Section Transformation: Section Orientation: Corner Transition
 * Select Constant to use a single profile
 * Select Multisection to use multiple profiles
 * Standard
 * This keeps the cross section shape perpendicular to the path. This is the default setting.
 * Fixed
 * 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.
 * Frenet
 * Create minimum possible twisting of profile. For more info, see Frenet-Serret Formulas
 * Auxiliary
 * Specify secondary path to guide pipe.
 * For each point along the sweep path, there will be a corresponding point  on the auxiliary path.
 * As the profile is swept, it will be transformed such that the line is the normal of the sweep path.
 * If is set, then the  points are scaled proportionally along the sweep path, regardless of is length.
 * Binormal
 * Specify binormal vector in X, Y and Z
 * Transformed
 * Right
 * Rounded

Properties

 * : name given to the operation, this name can be changed at convenience.
 * : true or false. If set to true, cleans the solid from residual edges left by features. See Part RefineShape for more details.
 * : lists the sections used.
 * : true or false (default). True extends the path to include tangent edges.
 * : true or false (default). True extends the auxiliary path to include tangent edges.
 * : true or false (default). True calculates normal between equidistant points on both spines.
 * : profile mode. See Options.
 * : binormal vector for corresponding orientation mode.
 * : transition mode. Options are Transformed, Right Corner or Round Corner.
 * : Constant uses a single cross-section. Multisection uses two or more cross-sections. Linear, S-shape and Interpolation are currently not functional.

Limitations

 * Only up to : It is not possible to pipe to a Vertex. Since you can pipe from or towards single vertices of sketches or bodies.
 * A cross-section cannot lie on the same plane as the one immediately preceding it.
 * When you select a Vertex as section, it must in most cases the last section of the pipe. 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 (some other CAD systems consider the origin of the cross-section as the path and do not require to place that sketch explicitly).
 * The cross-sections must not contain disjoint or crossing loops.