Constraints and Joints Creation

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Constraints and Joints Creation

 

Go to File arrowDCS Save Management.

Select the Lesson_4 Manual Gear Shifter Asm.CATProduct and select [Save As...].

Navigate to a New folder and rename to "Lesson5" that will be easily accessible later.

Click [Propagate Directory] to save a copy of the CATPart files to the new folder.

In the Save As dialog, rename the Product to "Lesson_5 Manual Gear shifter Asm" and click [Save].

In the Save Management dialog select [OK] to save the CATIA Product under its new name. The model is not saved until you click OK.

Go to [File] arrowDCS [Save As].

In the Save a Copy dialog, enter "Lesson_5 Manual Gear shifter Asm." for the File Name, make sure the Type is set to Assembly (*.asm), then click [OK].

In the Assembly Save a Copy dialog, click [Save Copy and Open] to save the assembly under its new name, and open the newly saved assembly.

Close the 3DCS Model Navigator and Creo window for Lesson_4 Manual Gear shifter Asm.

Click DVTI_dcsUpdateModel Update Model in the new window for Lesson_5 Manual Gear shifter Asm.

Go to [File] arrowDCS [Save As].

In the Save As dialog, enter "Lesson_5 Manual Gear shifter Asm" as the new File name and make sure the type is set to Part Files (*.prt).

Click [OK] in the Save As dialog.

Click DVTI_dcsUpdateModel Update Model.

Go to [File] → [Save As].

In the Save as dialog, enter "Lesson_5 Manual Gear shifter Asm" for the File Name, and make sure the Type is set to Assembly (*.asm).

In the Assembly Save as dialog, click [Save Copy and Open] in the bottom left of the dialog to save the assembly under its new name, and open the newly saved assembly.

Click Update Model in the new window for Lesson_5 Manual Gear shifter Asm.

Click the MC Application Button Icon Application Button then select MC 7500 Save As Icon Save As.

Change the File Name to "Lesson_5 Manual Gear Shifter Asm"and make sure the Type is set to WTX DATA(*.wtx)

Click [Save] in the Save As dialog.

 

For any model it’s a good practice to start the subassembly moves/constraints first followed by main assembly.

 

Let’s start with Pivot sub assembly.

Click on DVTI_movelist icon in the Model Creation Toolbar to create moves and the select the Pivot sub assembly from the tree.

 

clip0185

 

 

Make sure the sub assembly name is displayed correctly at the left top corner and then proceed to add the constraints to the sub assembly.

Select Coincidence from the drop down menu and click [Add Mechanical]

 

clip0186

 

 

MVM_Tutorial_ MC move lever axis empty

Name the move "Axis Select Pin and Pivot"

Add the Pin surface from the Select Pin in the Object list and Pivot hole in the target list.

MVM_Tutorial_Coincidence Pivot Asm Features

 

MVM_Tutorial_ MC move lever axis

Click the [Settings] tab and change the Drop DOF setting to Yes. This need to be done for all Coincidence Constraint that will created in the Model.

 

drop dof setting MVM tutorial MC

Click [OK] to create the move.

From the Moves dialog select Contact from the drop down list and click [Add Mechanical].

Rename the contact move “Surface contact Pivot & Select Pin”. Select the surfaces under object and target list as shown below.

 

 

MVM_Tutorial_Contact Pivot Asm Features

MVM_Tutorial_ MC move lever surface

 

Click [OK] to create the move.

It is a best practice to create a Fixtogether move for the sub assembly parts as the last move, which improves the Analysis speed. This is an optional move.

From the move List select FixTogether and click [Add Mechanical]

Rename the Move "FixTogether Select Pin and Pivot"

Add Select Pin and Pivot by clicking from the Graphics.

The Completed Dialog should look like the image below.

 

 

MVM_Tutorial_ MC move lever fixtogasm

 

Click [OK] to create the move.

Now Click DVTI_dcsNominalBuild Nominal Build to see the parts build using the moves.

Click DVTI_dcsSeparate_SP Separate

Click animate Animate. and step through each move.

Lever Assembly.

Build the Lever Assembly following the same steps.

 

clip0190

 

MVM_Tutorial_Lever Asm Features

Now Click DVTI_dcsNominalBuild Nominal Build to see the parts build using the moves.

Click DVTI_dcsSeparate_SP Separate

Click animate Animate. and step through each move.

 

Creating Main assembly moves

Click the DVTI_movelist Moves button from the toolbar and select the Top product to open the Move List dialog.

clip0194

 

 

Select Fixed Constraint from the Move List and click [Add Mechanical]

This will open the Fixed Constraint dialog

 

MVM_Tutorial_ MC move fixempty

Name the Move "Fix Frame"

Select the Frame Part from the Graphics and hit Ok.

 

MVM_Tutorial_ MC move fix

 

Move Mounting Block to Frame.

Mounting Block can be fully Constrained to Frame by 4 Moves.

The Moves should be created in the order shown below for the Features highlighted.

Change the Drop DOF Setting to Yes for all Coincidence Constraint

 

 

clip0193

 

 

 

 

 

 

 

MVM_Tutorial_Block to Frame Feature1

 

 

MVM_Tutorial_Block to Frame Feature2

 

 

 

MVM_Tutorial_Block to Frame Feature3

 

After Assembling the Mounting Block to the Frame, Create a Fix Together Constraint for the Two Parts.

 

MVM_Tutorial_ MC move fix tog

 

Moving Pivot Assembly to Mounting Block

 

The Pivot Assembly is assembled to mounting Block in the order shown below by selecting the features from Pivot and Mounting Block.

Notice that selecting Features from the Pivot will add the Pivot Assembly in the Move Part List which will move the whole assembly to the Mounting Block

 

 

 

MVM_Tutorial_ MC move list3

 

MVM_Tutorial_Pivot to Block Feature1

MVM_Tutorial_Pivot to Block Feature2

 

MVM_Tutorial_ MC coin move partpng

 

Moving Stick to Pivot Assembly and Frame

 

Use Coincidence Move for Axis Alignment between Stick and Select Pin.

MVM_Tutorial_select pin to stick

Use Offset Constraint for Surface Contact between Stick and Pivot with an offset distance of 0.2mm.

MVM_Tutorial_Stick to Pivot feature

 

 

The Offset value can be set in settings Tab in the Move Dialog.

 

 

MVM_Tutorial_ MC offset1

 

MVM_Tutorial_ MC offset2

 

 

Similarly complete the Offset Move between Stick and Frame with the offset value of 5mm.

MVM_Tutorial_Stick to Frame feature

 

 

The Complete list should look like below.

 

clip0192

 

Moving Link to Pivot Assembly and Lever Assembly

 

Use Coincidence Constraint to align the Sphere features of Link with Select Pin and Link to Lever Asm

 

 

MVM_Tutorial_Link moves

The Completed List should look as in below image,

 

 

clip0191

 

Move Lever Assembly to Frame

 

Use Offset Constraint to do a Surface Contact between Lever and Frame with an Offset of 5mm.

MVM_Tutorial_Lever and Frame features

 

 

MVM_Tutorial_ MC offset comp

 

 

MVM_Tutorial_ MC offset value

 

 

 

Next we will be using DVTI_RevoluteJnt Revolute Joint where the Axis and Plane can be Constraint in this single Move.

 

Select Revolute Joint from the Move List and Click [Add Mechanical]

 

MVM_Tutorial_ MC Revolute empty

Rename the Move to "Revolute Joint Lever to Frame"

Select the highlighted Hole from Lever and then hole from Frame.

Similarly select the Highlighted Planes from Lever and then frame.

 

MVM_Tutorial_Revolute  Features

 

 

MVM_Tutorial_ MC Revolute comp