# 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 _

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

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

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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