Constant-Velocity : Two Positions

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Constant-Velocity : Two Positions

Constant-Velocity | Two Position

See also : Constant-Velocity.


Motion-Description

Use the Flexible-Polynomial to define a segment that has Constant-Velocity between Two-Positions.

The Velocity is calculated from the Segment-Width and the difference between the End-Position and Start-Position.

You must make sure the Velocity at the end of the Previous-Segment is equal to the velocity of this segment.

The Acceleration and Jerk Values at the start and end of the segment are zero.

Motion-Values

You CAN control the:

Start-Position

The Start-Position usually flows from the End-Position of the Previous-Segment.

End-Position

You CANNOT control the:

Start-Velocity & End-Velocity

Start-Acceleration & End-Acceleration

Start-Jerk & End-Jerk

SEGMENT EDITOR: Control-Buttons for a 'Two Position | Constant-Velocity motion-law.

SEGMENT EDITOR: Control-Buttons for a 'Two Position | Constant-Velocity motion-law.

1.Use the Motion-Law Selector to select a Flexible-Polynomial motion-law

2.Select the Segment

3.Open the Segment Editor

4.Deselect Match-Velocity, Match-Acceleration, and Match-Jerk (Flow) Control-Buttons

5.Deselect Start Velocity, Start Acceleration, and Start Jerk Control-Buttons

6.Deselect End-Velocity, End-Acceleration, and End-Jerk Control-Buttons

7.Edit the Start-position and End-Position values

8.Edit the X-axis values.

2 Position, Constant-Velocity BUT Step Change in Velocity

2 Position, Constant-Velocity
BUT Step Change in Velocity

Note:

When the Constant-Velocity segment is one segment of a complete machine-cycle use a Gearing FB, to replace a Motion FB  - assuming a Linear-Motion FB is connected to the input of the Gearing FB.

When Gearing-Ratio = 1 (in the Gearing FB dialog), the output equals its input, it increases steadily from 0 to 360.

If, for example, you enter Gearing Ratio = 270/360, the output increases steadily from 0 to 270, when its input increases steadily 0 to 360.

Thus, you can see it is easy to use a Gearing FB to output a Constant-Velocity for a complete a machine-cycle.