Motion Creation

<< Click to Display Table of Contents >>

Navigation:  Tutorials > 3DCS Mechanical Tutorial > Writing Moves >

Motion Creation

The Kinematic Motion move works in conjunction with the Kinematic Animation and Kinematic Simulation routines. Kinematic Motion moves rotate or translate a part while maintaining joints and constraints. This allows the assembly to be analyzed at various positions. The Kinematic Animation graphically animates the selected kinematic motion move. The Kinematic Simulation function repeats the tolerance analysis at each step of the kinematic motion move.

clip0080 Kinematic Motion.

Create a Kinematic Motion move about the Lever assembly, to allow it to rotate about its hole axis.

On the DCS Mechanical toolbar, select clip0081 Kinematic Motion.

Select the top product, 3DCS_Manual_Gear Shifter, in the Navigation Tree.

Name the move "Rotate_Lever_See_range_of_motion" .

Under the Motion tab, change the Motion Type to Rotate Comp, the Motion Steps to 10, the Motion Beg Pos to -10deg, and the Motion End Pos to 10deg.

 

MVM_Tutorial_ MC Motion 4o

 

Under the Feature tab, select the Lever hole for the Center of Rotation and select on frame Hole for the Direction.  

MVM_Tutorial_Motion Features

 

 

 

 

 

MVM_Tutorial_ MC Motion 3o

Deactivate the move by un-checking the box at top left.

Click [OK] to create the kinematic move.

Add other motion move, with same features as above but rename as "Rotate_Lever_extreme_position".

Under the Motion tab, change the Motion Type to Rotate Comp, the Motion Steps to 0, the Motion Beg Pos to -10deg, and the Motion End Pos to 0deg. This will build at extreme position as nominal build and user can do deviation analysis at that position.

 

MVM_Tutorial_ MC Motion 2o

 

Deactivate the move by unchecking the box at top left.                        

The Move Parts tab should list just the lever assembly and Frame.

Click [OK] to create the kinematic move.

To view the range of motion (mechanism), activate the first motion move “Rotate_Lever_See_range_of_motion” by right click the Move from the tree and select clip0082Activate/Deactivate.

 

Deactivate the “Offset_Lever_Asm_to_Frame” move to avoid over constraining the model.

To test the motion, click on DVTI_dcsNominalBuild_SPNominal Build and clip0083 Deviate. The Lever should rotate and Stick should oscillate from its mean. Click [Close].

 

Motion moves should generally be placed immediately following the move that restricts the rest of their DoFs. In this model, motion move is right after Revolute joint.

If user want to navigate the moves to change the sequence of moves. Double click on moves icon under DCS main tree to open the Moves List dialog. Select the move to change the order, select the move number from switch To drop down list and select the number [#]. This will move the Move to desired location.

 

MVM_Tutorial_ MC switch to

 

 

Click on Kinematic Animation Kinematic Animation to observe the motion of the Gear Shifter step by step. Make sure the First motion move is Active.

Kinematic Animation dialog

 

MVM_Tutorial_ MC Animation

The dropdown menu lists all available motion moves. In this case, Motion_Gear Shifter is the only option.

Use the (clip0084 or clip0085) Single Arrows to scroll through individual steps one by one.

Use the (clip0086 or clip0087) Ending Arrows to observe the model running through all steps. The clip0088 Hold/Pause button will stop the animation from running at any point.

Click [Close] to exit the animation.

Save the Model.