diff --git a/EgtMachKernel.rc b/EgtMachKernel.rc
index e74bd8c..c448ac0 100644
Binary files a/EgtMachKernel.rc and b/EgtMachKernel.rc differ
diff --git a/FiveAxisMilling.cpp b/FiveAxisMilling.cpp
index b4e71b4..dc03fd2 100644
--- a/FiveAxisMilling.cpp
+++ b/FiveAxisMilling.cpp
@@ -540,6 +540,21 @@ FiveAxisMilling::Preview( bool bRecalc)
 //----------------------------------------------------------------------------
 bool
 FiveAxisMilling::Apply( bool bRecalc, bool bPostApply)
+{
+  // se calcoli gią in corso, esco
+   if ( m_bRunning) {
+      LOG_DBG_INFO( GetEMkLogger(), "FiveAxisMilling::Apply already running") ;
+      return true ;
+   }
+   m_bRunning = true ;
+   bool bOk = MyApply( bRecalc, bPostApply) ;
+   m_bRunning = false ;
+   return bOk ;
+}
+
+//----------------------------------------------------------------------------
+bool
+FiveAxisMilling::MyApply( bool bRecalc, bool bPostApply)
 {
   // reset numero percorsi di lavoro generati
    int nCurrMills = m_nMills ;
diff --git a/FiveAxisMilling.h b/FiveAxisMilling.h
index f2dabc6..c7c5c4d 100644
--- a/FiveAxisMilling.h
+++ b/FiveAxisMilling.h
@@ -67,6 +67,7 @@ class FiveAxisMilling : public Machining
       FiveAxisMilling( void) ;
 
    private :
+      bool MyApply( bool bRecalc, bool bPostApply) ;
       bool VerifyGeometry( SelData Id, int& nSubs, int& nType) ;
       double GetApproxLinTol( void) const override ;
 
@@ -92,4 +93,5 @@ class FiveAxisMilling : public Machining
       ToolData             m_TParams ;         // parametri utensile
       int                  m_nStatus ;         // stato di aggiornamento della lavorazione
       int                  m_nMills ;          // numero di percorsi di lavoro generati
+      bool                 m_bRunning ;        // flag di calcoli in corso
 } ;
diff --git a/SurfFinishing.cpp b/SurfFinishing.cpp
index 9b298c5..65c1170 100644
--- a/SurfFinishing.cpp
+++ b/SurfFinishing.cpp
@@ -234,6 +234,7 @@ SurfFinishing::SurfFinishing( void)
    m_dTHoldDiam = 0 ;
    m_nStatus = MCH_ST_TO_VERIFY ;
    m_nPaths = 0 ;
+   m_bRunning = false ;
 }
 
 //----------------------------------------------------------------------------
@@ -500,6 +501,21 @@ SurfFinishing::Preview( bool bRecalc)
 //----------------------------------------------------------------------------
 bool
 SurfFinishing::Apply( bool bRecalc, bool bPostApply)
+{
+  // se calcoli giĆ  in corso, esco
+   if ( m_bRunning) {
+      LOG_DBG_INFO( GetEMkLogger(), "SurfFinishing::Apply already running") ;
+      return true ;
+   }
+   m_bRunning = true ;
+   bool bOk = MyApply( bRecalc, bPostApply) ;
+   m_bRunning = false ;
+   return bOk ;
+}
+
+//----------------------------------------------------------------------------
+bool
+SurfFinishing::MyApply( bool bRecalc, bool bPostApply)
 {
   // reset numero tagli nella lavorazione
    int nCurrPaths = m_nPaths ;
diff --git a/SurfFinishing.h b/SurfFinishing.h
index 2314f12..47fbac7 100644
--- a/SurfFinishing.h
+++ b/SurfFinishing.h
@@ -84,6 +84,7 @@ class SurfFinishing : public Machining
       SurfFinishing( void) ;
 
    private :
+      bool MyApply( bool bRecalc, bool bPostApply) ;
       bool VerifyGeometry( SelData Id, int& nSubs) ;
       bool GetCurves( SelData Id, ICURVEPLIST& lstPC) ;
       bool Chain( int nGrpDestId) ;
@@ -94,7 +95,7 @@ class SurfFinishing : public Machining
                                     const Frame3d& frSurf, const Vector3d& vtTool, double dDepth,
                                     const Point3d ptStart_forced, const Point3d ptEnd_forced,
                                     ICurveComposite* pCrv) ;
-     // lavorazioni per surperfici
+     // lavorazioni per superfici
       bool AddZigZag( ICAvToolSurfTm* pCAvTlStm, const Frame3d& frSurf, const ISurfFlatRegion* pSfrPock,
                       const Vector3d& vtTool, double dDepth, double dElev, bool bSplitArcs) ;
       bool AddOneWay( ICAvToolSurfTm* pCAvTlStm, const Frame3d& frSurf, const ISurfFlatRegion* pSfrPock,
@@ -171,4 +172,5 @@ class SurfFinishing : public Machining
       double            m_dTHoldDiam ;      // diametro del porta-utensile
       int               m_nStatus ;         // stato di aggiornamento della lavorazione
       int               m_nPaths ;          // numero di percorsi di lavoro generati
+      bool              m_bRunning ;        // flag di calcoli in corso
 } ;
diff --git a/SurfRoughing.cpp b/SurfRoughing.cpp
index 6009e3e..bd869e1 100644
--- a/SurfRoughing.cpp
+++ b/SurfRoughing.cpp
@@ -533,6 +533,21 @@ SurfRoughing::Preview( bool bRecalc)
 //----------------------------------------------------------------------------
 bool
 SurfRoughing::Apply( bool bRecalc, bool bPostApply)
+{
+  // se calcoli giĆ  in corso, esco
+   if ( m_bRunning) {
+      LOG_DBG_INFO( GetEMkLogger(), "SurfRoughing::Apply already running") ;
+      return true ;
+   }
+   m_bRunning = true ;
+   bool bOk = MyApply( bRecalc, bPostApply) ;
+   m_bRunning = false ;
+   return bOk ;
+}
+
+//----------------------------------------------------------------------------
+bool
+SurfRoughing::MyApply( bool bRecalc, bool bPostApply)
 {
   // reset numero tagli nella lavorazione
    int nCurrPaths = m_nPaths ;
diff --git a/SurfRoughing.h b/SurfRoughing.h
index ba0fbff..fb97f7b 100644
--- a/SurfRoughing.h
+++ b/SurfRoughing.h
@@ -103,6 +103,7 @@ class SurfRoughing : public Machining
       SurfRoughing( void) ;
 
    private :
+      bool MyApply( bool bRecalc, bool bPostApply) ;
       bool VerifyGeometry( SelData Id, int& nSubs) ;
       bool GetCurves( SelData Id, ICURVEPLIST& lstPC) ;
       bool Chain( int nGrpDestId) ;
@@ -200,4 +201,5 @@ class SurfRoughing : public Machining
       double            m_dStepToler ;      // tolleranza di rimozione chunk per Steps
       double            m_dSubStepToler ;   // tolleranza di rimozione chunk per SubSteps
       bool              m_bDetectPlaneZ ;   // flag per calcolo piani in Zloc di Pocketing
+      bool              m_bRunning ;        // flag di calcoli in corso
 } ;
\ No newline at end of file