A Motion-Part and a Motion-Point are very similar elements:
• | Motion-Part: a Part, whose motion is constrained by a joint, whose position is identified by its Motion Dimension, and whose motion is defined by the input to the Motion-Dimension FB. |
• | Motion-Point: a Point, whose motion is constrained by a sketch, whose position is identified by its Motion-Point Dimension, and whose motion is defined by the input to the Motion-Path FB. |
Motion-Path FB & Motion-Point |
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Add Motion-Path FB:
Note: To see the Motion-Point Dimension
In the Motion-Path dialog-box > Point List and Data Display separator:
Displacement: the linear distance along the sketch-path. Phase: the distance along the sketch-path normalized between 0 and 360. 360 is the complete length of the sketch-path. |
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Motion-Dimension FB & Motion-Part |
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Add Motion-Dimension FB does three things. It:
Motion-Part: a Part constrained by a joint. Its position from a sketch-element in a different Part, is the total of values given by:
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About the Blend-Curve A Blend-Curve is a sketch-element. Use the Blend-Curve dialog-box to specify, at its start-Point
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Question: Why do we need a Blend-Curve? Answer: To eliminate a curvature-discontinuity. Question: What is a curvature-discontinuity? Answer: Even with tangency, at the instant a Motion-Point moves between sketch-elements that have different radii, (e.g. from an Arc to a Line (and vice versa), or from an Arc to a different Arc with a different radii) it experiences a curvature-discontinuity. Question: What is wrong with a curvature-discontinuity? Answer: If you join a machine element to the moving Motion-Point, the curvature-discontinuity between different sketch-elements will give rise to vibrations of the machine-element. To reduce mechanical vibrations, you must eliminate the curvature-discontinuity. The purpose of the Blend-Curve element is to eliminate curvature-discontinuities as the Motion-Point moves along the sketch-path and between sketch-elements. |