Add Blend-Curve
See also: Blend-Curve dialog-box
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Toolbar :
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Menu :
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To Add :
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| 2. | Part-Editor: Drag in the graphic-area from the start-Point to the end-Point. |
Drag: mouse-button-down (start-Point), move your mouse-pointer, mouse-button-up (end-Point).
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The Blend-Curve is now in the graphic-area.
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To Edit :
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See Blend-Curve dialog-box and Drag-Handles
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Notes:
Add with Free-Points* to locate a joint or add as a layout-sketch.
Do NOT HOVER above a Point* before you mouse-button-down or mouse-button-up.
See also: How to Delete a Constraint
Add with Merged-Points* to construct a or sketch-loop
Do HOVER above a Point* before you mouse-button-down or mouse-button-up.
The Angle, Slope, and Curvature of the Blend-Curve you add will equal that of the sketch-element with which you merge.
See: , .
Point* : start-Point, end-Point, centre-Point.
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Example
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How:
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Selection-Window
Assembly-Tree
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| • | Drag from the start to the end Point of Blend-Curve |
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Blend-Curven
Pointn at each end of the CAD-Line
The Blend-Curve is a child to the Part.
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The default Angle, Curvature and Curvature Rate at the start-Point and end-Point of the Blend-Curve are zero.
The images to the left and above are default Blend-Curves.
| • | The Blend-Curve at the top has been added with a drag from bottom-left to top-right. |
| • | The Blend-Curve at the bottom has been added with a drag from top-right to bottom-left. |
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| • | Hover + Drag from the end-Point of a different sketch-element to merge the start-Point of as new Blend-Curve. |
When you merge the Blend-Curve with a sketch-element, the Blend-Curve matches the Angle, Curvature and Curvature Rate with the other sketch-element.
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 Two Blend-Curves |
A Blend-Curve is a special 2D path
Blend-Curve parameters at its start-Point and end-Point:
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 Arcs and Lines |
Use Blend-Curve to give a smooth sketch-path. See also Smoothness.
If the Blend-Curve is to guide a Motion-Point which will also guide a Part, it is important that:
| • | The motion of the Motion-Point along a sketch-path does not have discontinuities in position, velocity, acceleration, and jerk. |
and the:
| • | The shape of the sketch-path itself does not have discontinuities in angle, curvature, and rate-of-change of curvature. |
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Smoothness of Sketch-elements.
You are often concerned with the smoothness of the sketch, especially at the transition between sketch-elements. This is important when the sketch-path is for a Motion-Point that also moves a kinematic-chain.
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Angle
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Curvature
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Curvature Rate
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Line joins a Line
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Can 'kink', be the same angle (why two Lines?)
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NA
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NA
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Arc joins a Line
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Keep the same Angle
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Keep the same Curvature (or Radius)
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NA
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Arc joins an Arc
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Keep the same Angle
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Keep the same Curvature (or Radius)
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NA
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Blend-Curve joins a Line
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Keep the same Angle
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Keep the same Curvature=0 (infinite Radius)
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Keep at 0
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Blend-Curve joins an Arc
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Keep the same Angle
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Keep the same Curvature; Radius
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Keep at 0
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Blend-Curve joins a Blend-Curve
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Keep the same Angle
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Keep the same Curvature; Radius
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Keep the same Curvature Rate
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