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Set Dimensions to Mid-Tolerance Example (VBA)

This example shows how to iterate over all dimensions in a part and set each of them to the middle of their tolerance range. This example does not analyze the overall effect of varying tolerances. That operation is beyond the scope of this example.

 

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

'

' Problem:

'       Dimensions are usually nominal sizes.

'       A tolerance can also be specified and, in general,

'       to set upper and lower limits for the

'       dimension.

'

'       When calculating CAM machining paths, it is desirable

'       to use a part that is in the middle of the tolerance

'       ranges so that the final, machined part has

'       the highest probability within the

'       overall tolerances for the design.

'

'

' Preconditions:

'       (1) Part is open.

'       (2) Optionally, part has dimensions with tolerances

'

' Postconditions:

'       (1) Derived configuration, based on the current

'           configuration, is created.

'       (2) Derived configuration is active configuration.

'       (3) Derived configuration has all dimensions set to

'           mid-tolerance.

'       (4) All tolerances are removed from dimensions.

'

' NOTE: All dimensions with a tolerance are set to

'        mid-tolerance.

'

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

 

Option Explicit

Function GetDimFactor _

( _

    swApp As SldWorks.SldWorks, _

    swModel As SldWorks.ModelDoc2, _

    swDim As SldWorks.Dimension _

) As Double

    Const PI                    As Double = 3.14159265

    Const LEN_FACTOR            As Double = 1000#

    Const ANG_FACTOR            As Double = 180# / PI

    

    Select Case swDim.GetType

        Case swDimensionParamTypeDoubleLinear

            GetDimFactor = LEN_FACTOR

            

        Case swDimensionParamTypeDoubleAngular

            GetDimFactor = ANG_FACTOR

            

        Case Else

            Debug.Assert False

    End Select

End Function

Function GetDimString _

( _

    swApp As SldWorks.SldWorks, _

    swModel As SldWorks.ModelDoc2, _

    swDim As SldWorks.Dimension _

) As String

    Const LEN_STR               As String = " mm"

    Const ANG_STR               As String = " deg"

    

    Select Case swDim.GetType

        Case swDimensionParamTypeDoubleLinear

            GetDimString = LEN_STR

            

        Case swDimensionParamTypeDoubleAngular

            GetDimString = ANG_STR

            

        Case Else

            Debug.Assert False

    End Select

End Function

Sub SetDimensionToMidTolerance _

( _

    swApp As SldWorks.SldWorks, _

    swModel As SldWorks.ModelDoc2, _

    swDim As SldWorks.Dimension _

)

    Dim nRetval                 As Long

    Dim nDimFactor              As Double

    Dim sDimStr                 As String

    Dim vTolVal                 As Variant

    Dim nOldVal                 As Double

    Dim nNewVal                 As Double

    Dim bRet                    As Boolean

    If swDimensionDriving <> swDim.DrivenState Or _

        swDim.ReadOnly Then

        Exit Sub

    End If

    

    ' May have tolerance values stored from

    ' previous tolerance type, so check current

    ' tolerance type first

    If swTolNONE = swDim.GetToleranceType Then

        Exit Sub

    End If

    ' Mid-tolerance cannot make sense for a MIN/MAX tolerance

    If swTolMIN = swDim.GetToleranceType Or _

        swTolMAX = swDim.GetToleranceType Then

        Exit Sub

    End If

    vTolVal = swDim.GetToleranceValues

    If IsEmpty(vTolVal) Then

        Exit Sub

    End If

    

    nDimFactor = GetDimFactor(swApp, swModel, swDim)

    sDimStr = GetDimString(swApp, swModel, swDim)

    

    nOldVal = swDim.GetSystemValue2("")

    nNewVal = nOldVal + (vTolVal(0) + vTolVal(1)) / 2#

    Debug.Print "    -->"

    Debug.Print "      Old Value    = " & nOldVal * nDimFactor & sDimStr

    Debug.Print "      New Value    = " & nNewVal * nDimFactor & sDimStr

    nRetval = swDim.SetSystemValue3(nNewVal, swSetValue_InThisConfiguration, Empty): Debug.Assert swSetValue_Successful = nRetval

    

    ' Changed to mid tolerance, so remove tolerance;

    ' otherwise, will change dimension when run again

    bRet = swDim.SetToleranceType(swTolNONE): Debug.Assert bRet

End Sub

Sub ProcessDimension _

( _

    swApp As SldWorks.SldWorks, _

    swModel As SldWorks.ModelDoc2, _

    swDim As SldWorks.Dimension _

)

    Dim nDimFactor              As Double

    Dim sDimStr                 As String

    Dim vTolVal                 As Variant

    Dim bRet                    As Boolean

    

    nDimFactor = GetDimFactor(swApp, swModel, swDim)

    sDimStr = GetDimString(swApp, swModel, swDim)

    

    Debug.Print "    " & swDim.FullName

    Debug.Print "      Value        = " & swDim.GetSystemValue2("") * nDimFactor & sDimStr

    Debug.Print "      Driven       = " & swDim.DrivenState

    Debug.Print "      ReadOnly     = " & swDim.ReadOnly

    

    vTolVal = swDim.GetToleranceValues

    If IsEmpty(vTolVal) Then

        Debug.Print "      No tolerance info"

        Exit Sub

    End If

    

    Debug.Print "      TolType      = " & swDim.GetToleranceType

    Debug.Print "      FitType      = " & swDim.GetToleranceFitValues

    Debug.Print "      MaxTol       = " & vTolVal(1) * nDimFactor & sDimStr

    Debug.Print "      MinTol       = " & vTolVal(0) * nDimFactor & sDimStr

End Sub

Sub ProcessMassProps _

( _

    swApp As SldWorks.SldWorks, _

    swModel As SldWorks.ModelDoc2 _

)

    Dim swDocExt                As SldWorks.ModelDocExtension

    Dim swMass                  As SldWorks.MassProperty

    Set swDocExt = swModel.Extension

    Set swMass = swDocExt.CreateMassProperty

    Debug.Print "    Mass             = " & swMass.Mass * 1000# & " g"

    Debug.Print "    Surface Area     = " & swMass.SurfaceArea * 1000000# & " mm^2"

    Debug.Print "    Volume           = " & swMass.Volume * 1000000000# & " mm^3"

    Debug.Print "    Density          = " & swMass.Density & " kg/m^3"

    Debug.Print "    CenterOfMass     = (" & swMass.CenterOfMass(0) * 1000# & ", " & swMass.CenterOfMass(1) * 1000# & ", " & swMass.CenterOfMass(2) * 1000# & ") mm"

End Sub

Sub main()

    Dim swApp                   As SldWorks.SldWorks

    Dim swModel                 As SldWorks.ModelDoc2

    Dim swConf                  As SldWorks.Configuration

    Dim swMidConf               As SldWorks.Configuration

    Dim swConfMgr               As SldWorks.ConfigurationManager

    Dim swFeat                  As SldWorks.feature

    Dim swDispDim               As SldWorks.DisplayDimension

    Dim swDim                   As SldWorks.Dimension

    Dim bRet                    As Boolean

    

    Set swApp = Application.SldWorks

    Set swModel = swApp.ActiveDoc

    Set swConf = swModel.GetActiveConfiguration

    Set swConfMgr = swModel.ConfigurationManager

    Set swMidConf = swConfMgr.AddConfiguration( _

                        swConf.Name & " - mid tolerance", _

                        "mid tolerance", _

                        "mid tolerance", _

                        0, _

                        swConf.Name, _

                        "mid tolerance"): Debug.Assert Not swMidConf Is Nothing

    Set swFeat = swModel.FirstFeature

    

    

    Debug.Print "File = " & swModel.GetPathName

    

    Debug.Print "  Nominal Tolerance:"

    ProcessMassProps swApp, swModel

    Debug.Print "  -----------------------------"

    

    Do While Not swFeat Is Nothing

        Debug.Print "  " & swFeat.Name

        

        Set swDispDim = swFeat.GetFirstDisplayDimension

        Do While Not swDispDim Is Nothing

            Set swDim = swDispDim.GetDimension

            

            ProcessDimension swApp, swModel, swDim

            SetDimensionToMidTolerance swApp, swModel, swDim

            

            Set swDispDim = swFeat.GetNextDisplayDimension(swDispDim)

        Loop

        Set swFeat = swFeat.GetNextFeature

    Loop

    

    bRet = swModel.ForceRebuild3(False): Debug.Assert bRet

    Debug.Print "  Middle Tolerance:"

    ProcessMassProps swApp, swModel

    Debug.Print "  -----------------------------"

End Sub

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



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