diff --git a/Drilling.h b/Drilling.h
index 7534321..b37d457 100644
--- a/Drilling.h
+++ b/Drilling.h
@@ -48,8 +48,8 @@ class Drilling : public Machining
       const ToolData& GetToolData( void) const override ;
       bool GetGeometry( SELVECTOR& vIds) const override ;
       bool AdjustPositionForAxesCalc( const CamData* pCamData, Point3d& ptP) override ;
-      bool IsNotEmpty( void) const override
-              { return ( m_nDrillings > 0) ; }
+      bool IsEmpty( void) const override
+              { return ( m_nDrillings == 0) ; }
 
    public :
       Drilling( void) ;
diff --git a/EgtMachKernel.rc b/EgtMachKernel.rc
index 9da9e71..10c7175 100644
Binary files a/EgtMachKernel.rc and b/EgtMachKernel.rc differ
diff --git a/Generator.cpp b/Generator.cpp
index 3e0557a..b21393c 100644
--- a/Generator.cpp
+++ b/Generator.cpp
@@ -280,7 +280,7 @@ Generator::ProcessMachining( int nOpId, int nOpInd)
       return false ;
 
   // Verifico non sia vuota
-   if ( ! m_pMchMgr->IsNotEmpty())
+   if ( m_pMchMgr->IsEmpty())
       return true ;
 
   // Recupero l'utensile della lavorazione corrente
diff --git a/MachMgr.h b/MachMgr.h
index a99b06a..9b58f4b 100644
--- a/MachMgr.h
+++ b/MachMgr.h
@@ -185,7 +185,7 @@ class MachMgr : public IMachMgr
       bool GetMachiningParam( int nType, double& dVal) const override ;
       bool GetMachiningParam( int nType, std::string& sVal) const override ;
       bool GetMachiningGeometry( SELVECTOR& vIds) const override ;
-      bool IsNotEmpty( void) const override ;
+      bool IsEmpty( void) const override ;
      // Simulation
       bool SimStart( void) override ;
       bool SimMove( int& nStatus) override ;
diff --git a/MachMgrOperations.cpp b/MachMgrOperations.cpp
index 650ed41..6452390 100644
--- a/MachMgrOperations.cpp
+++ b/MachMgrOperations.cpp
@@ -693,7 +693,7 @@ MachMgr::GetMachiningGeometry( SELVECTOR& vIds) const
 
 //----------------------------------------------------------------------------
 bool
-MachMgr::IsNotEmpty( void) const
+MachMgr::IsEmpty( void) const
 {
   // recupero la lavorazione corrente
    int nCurrMchId = GetCurrMachining() ;
@@ -704,5 +704,5 @@ MachMgr::IsNotEmpty( void) const
    if ( pMch == nullptr)
       return false ;
   // restituisco lo stato
-   return pMch->IsNotEmpty() ;
+   return pMch->IsEmpty() ;
 }
diff --git a/Machining.cpp b/Machining.cpp
index 1eaff08..febeb3e 100644
--- a/Machining.cpp
+++ b/Machining.cpp
@@ -534,7 +534,7 @@ Machining::CalculateAxesValues( void)
    int nPrevOpId = m_pMchMgr->GetPrevActiveOperation( m_nOwnerId) ;
    Machining* pPrevMch = dynamic_cast<Machining*>( m_pGeomDB->GetUserObj( nPrevOpId)) ;
    while ( pPrevMch != nullptr) {
-      if ( pPrevMch->IsNotEmpty())
+      if ( ! pPrevMch->IsEmpty())
          break ;
       else {
          nPrevOpId = m_pMchMgr->GetPrevActiveOperation( nPrevOpId) ;
@@ -703,7 +703,7 @@ Machining::AdjustStartEndMovements(void)
    int nPrevOpId = m_pMchMgr->GetPrevActiveOperation( m_nOwnerId) ;
    Machining* pPrevMch = dynamic_cast<Machining*>( m_pGeomDB->GetUserObj( nPrevOpId)) ;
    while ( pPrevMch != nullptr) {
-      if ( pPrevMch->IsNotEmpty())
+      if ( ! pPrevMch->IsEmpty())
          break ;
       else {
          nPrevOpId = m_pMchMgr->GetPrevActiveOperation( nPrevOpId) ;
diff --git a/Machining.h b/Machining.h
index ce7ce43..11f25b2 100644
--- a/Machining.h
+++ b/Machining.h
@@ -48,7 +48,7 @@ class Machining : public IUserObj
       virtual const ToolData& GetToolData( void) const = 0 ;
       virtual bool GetGeometry( SELVECTOR& vIds) const = 0 ;
       virtual bool AdjustPositionForAxesCalc( const CamData* pCamData, Point3d& ptP) = 0 ;
-      virtual bool IsNotEmpty( void) const = 0 ;
+      virtual bool IsEmpty( void) const = 0 ;
 
    protected :
       Machining( void) ;
diff --git a/Milling.h b/Milling.h
index fc8e1d4..947dccd 100644
--- a/Milling.h
+++ b/Milling.h
@@ -47,8 +47,8 @@ class Milling : public Machining
       const ToolData& GetToolData( void) const ;
       bool GetGeometry( SELVECTOR& vIds) const override ;
       bool AdjustPositionForAxesCalc( const CamData* pCamData, Point3d& ptP) override ;
-      bool IsNotEmpty( void) const override
-              { return false ; }
+      bool IsEmpty( void) const override
+              { return true ; }
 
    public :
       Milling( void) ;
diff --git a/Sawing.h b/Sawing.h
index 8aa0c96..e3414d1 100644
--- a/Sawing.h
+++ b/Sawing.h
@@ -48,8 +48,8 @@ class Sawing : public Machining
       const ToolData& GetToolData( void) const override ;
       bool GetGeometry( SELVECTOR& vIds) const override ;
       bool AdjustPositionForAxesCalc( const CamData* pCamData, Point3d& ptP) override ;
-      bool IsNotEmpty( void) const override
-              { return ( m_nCuts > 0) ; }
+      bool IsEmpty( void) const override
+              { return ( m_nCuts == 0) ; }
 
    public :
       Sawing( void) ;
diff --git a/Simulator.cpp b/Simulator.cpp
index 7a0722d..2e556f7 100644
--- a/Simulator.cpp
+++ b/Simulator.cpp
@@ -73,7 +73,7 @@ Simulator::Start( void)
    Machining* pMch = dynamic_cast<Machining*>( m_pGeomDB->GetUserObj( nOpId)) ;
    while ( nOpId != GDB_ID_NULL) {
       if ( IsValidMachiningType( m_pMchMgr->GetOperationType( nOpId))  &&
-           pMch != nullptr  &&  pMch->IsNotEmpty())
+           pMch != nullptr  &&  ! pMch->IsEmpty())
          break ;
       nOpId = m_pMchMgr->GetNextActiveOperation( m_nOpId) ;
       pMch = dynamic_cast<Machining*>( m_pGeomDB->GetUserObj( nOpId)) ;
@@ -128,7 +128,7 @@ Simulator::Move( int& nStatus)
       Machining* pMch = dynamic_cast<Machining*>( m_pGeomDB->GetUserObj( m_nOpId)) ;
       while ( m_nOpId != GDB_ID_NULL) {
          if ( IsValidMachiningType( m_pMchMgr->GetOperationType( m_nOpId))  &&
-              pMch != nullptr  &&  pMch->IsNotEmpty())
+              pMch != nullptr  &&  ! pMch->IsEmpty())
             break ;
          m_nOpId = m_pMchMgr->GetNextActiveOperation( m_nOpId) ;
          pMch = dynamic_cast<Machining*>( m_pGeomDB->GetUserObj( m_nOpId)) ;