Setting command value in KIN mechanism

Mauro MARTARELLO

Setting command value in KIN mechanism

I have a two mechanisms and each one contains three commands.

Does anyone know how can I assign a specific value to a command?

 

In V5 Automation help there is a macro called "CAAKiiMechanismSolve" : "This macro shows you how to retrieve motion for a moving part of a mechanism, after applying new command values. The macro assumes that a CATProduct has been loaded, with one mechanism having at least two commands." but I'm not be able to find out how to recognize specific command.

 

Thanks.

Mauro MARTARELLO

RE: Setting command value in KIN mechanism
(in response to Mauro MARTARELLO)

Nobody has never had a similar situation?

If any, other approach are welcome!

 

thanks in advance.

Little Cthulhu

RE: Setting command value in KIN mechanism
(in response to Mauro MARTARELLO)
Hi.
Use PutCommandValues method of Mechanism class. Other approach is through parameters - check if any values are held in a such form

Mike Berry

RE: Setting command value in KIN mechanism
(in response to Mauro MARTARELLO)

Hi Mauro,

Below I posted some example code that might help you.  You can get the current command positions of a mechanism or set the positions (move the mechanism) via an array of those command values.  I also included a function that will give you the index of a mechanism command from the name of the command.  I find this useful because you can't directly get a command from it's name, so I use this in my projects so that I can properly setup the positions array and understand which index is which command (often kin models are built with commands in different order, etc.).  Good luck.

-Mike

 

'--------------------------------------------------------------------------------

Private Sub Test_GetCommandIndexFromName()

    Dim objMechanism As Mechanism

    'Assume active document is product and one mechanism exists...
    Set objMechanisms = CATIA.ActiveDocument.Product.GetTechnologicalObject("Mechanisms")
    Set objMechanism = objMechanisms.Item(1)
   
    'Display the index of a command whose name is matching the expression
    MsgBox GetCommandIndexFromName(objMechanism, "CAM*", False)

End Sub

 

'--------------------------------------------------------------------------------

Function GetCommandIndexFromName(ByRef iMechanism As Mechanism, ByVal iNameExpression As String, _
                                        ByVal iCaseSensitive As Boolean) As Integer

    'Returns the index of a kinematic mechanism command based on it's name
    'The name comparison is done using the VB Like operator which is similar to a regular expression
    'Lookup Like in the VB help docs for examples...

    Dim intIndex As Integer
    Dim objCmd As MechanismCommand
    Dim strCmdName As String
    Dim strExpression As String

    If iCaseSensitive = False Then strExpression = UCase(iNameExpression)

    If iMechanism.Commands.Count > 0 Then
        For intIndex = 1 To iMechanism.Commands.Count
            Set objCmd = iMechanism.Commands.Item(intIndex)
            If iCaseSensitive = False Then
                strCmdName = UCase(objCmd.Name)
            Else
                strCmdName = objCmd.Name
            End If
            If strCmdName Like strExpression = True Then
                GetCommandIndexFromName = intIndex
                Exit Function
            End If
        Next
    End If
    GetCommandIndexFromName = 0

End Function

'--------------------------------------------------------------------------------
Sub SimulateExample()

    'Assume active document is product and one mechanism exists...need KIN license too.
    Set objMechanisms = CATIA.ActiveDocument.Product.GetTechnologicalObject("Mechanisms")
    Set objMechanism = objMechanisms.Item(1)
   
    'Get the number of commands and create an array of the current position
    intNbCommands = objMechanism.NbCommands - 1
    ReDim varPosition(intNbCommands)
    objMechanism.GetCommandValues varPosition

    'Move the first mechanism command through 5 steps of bumping the value up by 3
    For intIndex = 1 To 5
        varPosition(0) = varPosition(0) + 3
        objMechanism.PutCommandValues varPosition
    Next
   
End Sub

 

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Mauro MARTARELLO

RE: Setting command value in KIN mechanism
(in response to Mike Berry)

Mike, Little,

thanks for your suggestions, I'm looking to adapt them to my scenario.

Victor Avila

RE: Setting command value in KIN mechanism
(in response to Mike Berry)

Hello all,

I have a question, as I am trying to set up in place a vector extracted from Matlab.

I have a txt file, with the structure demanded as per the laws, so I would like to replicate the behaviour of CATIA as follows:

1. Click on Applications/Mechanism/Command

2. Option --> Import law 

3. Pass on the path of the file that contains the law.

Do you have any template or something?

I don't mind if I had to import the txt and send the commands through the instruction PutCommandValues. BTW, is it possible to set an array (my law txt files has two columns time and angle) with PutCommandValues or PutCommandValuesWithMultiSteps. 

Regards,

Victor