Add Blend-Curve
See also: Blend-Curve dialog
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1.Click >
OR
1.Click |
2.Drag in the graphics-area from the start-Point to its 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 graphics-area.
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To with a free start-Point and/or end-Point.
To with a merged start-Point and/or end-Point.
Do HOVER above a Point* before you mouse-button-down or mouse-button-up.
See: Hover+Drag Video
Note:
The Blend-Curve automatically adjusts its Angle, Curvature, and Curvature-Rate to equal those of the sketch-element with which you merge the Blend-Curve.
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* Point, start-Point, end-Point, center-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-Point to the end Point of Blend-Curve |
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 in the upper image has been added by dragging from lower-left to upper-right.
•The Blend-Curve in the image to the left has been added by dragging from upper-left to lower-right. |
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•Hover+Drag from the end-Point of a different sketch-element to merge the start-Point of a new Blend-Curve.
•The Blend-Curve matches the Angle, Curvature and Curvature Rate with the other sketch-element. |
 Continuous Curvature AND Curvature Rate |
A Blend-Curve is a useful sketch-element for smooth sketch-paths.
You can control these parameters at its start-Point and end-Point:
•Angle
•Curvature
•Curvature-Rate
•Velocity Scaling
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 ARCS: Tangent Arcs are NOT Smooth
This path is NOT smooth - Tangent arcs (with different Radii) have discontinuous Curvature.
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Use a Blend-Curve to give a smooth sketch-path. See also Smoothness.
If the Blend-Curve is to guide a Motion-Point which also guides a Part, it is important that:
•The motion along a sketch-path does not have discontinuities in position, velocity, acceleration, and jerk.
and
•The shape of the sketch-path does not have discontinuities in angle, curvature, and rate-of-change of curvature. |
Smoothness of Sketch-elements.
You are frequently concerned with the smoothness of a sketch-path.
The smoothness at the transition between sketch-element is important when a Motion-Point moves along the sketch-elements.
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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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URL of this topic:
http://mechdesigner.support/index.htm?md-geometry-blend-curve.htm
