diff --git a/MachiningsMgr.cpp b/MachiningsMgr.cpp
index ba40516..81ca5df 100644
--- a/MachiningsMgr.cpp
+++ b/MachiningsMgr.cpp
@@ -51,6 +51,8 @@ const string MF_HOLEDTOL = "HOLEDTOL" ;
 const double MF_CURR_HOLEDTOL = 10 * EPS_SMALL ;
 const string MF_EXTSAWARCMINRAD = "EXTSAWARCMINRAD" ;
 const double MF_CURR_EXTSAWARCMINRAD = 200 ;
+const string MF_SPLITARCS = "SPLITARCS" ;
+const int    MF_CURR_SPLITARCS = SPLAR_NEVER ;
 
 
 //----------------------------------------------------------------------------
@@ -67,6 +69,7 @@ MachiningsMgr::MachiningsMgr( void)
    m_dExtraROnDrillRegion = MF_CURR_EXTRARDR ;
    m_dHoleDiamToler = MF_CURR_HOLEDTOL ;
    m_dExtSawArcMinRad = MF_CURR_EXTSAWARCMINRAD ;
+   m_nSplitArcs = MF_CURR_SPLITARCS ;
 }
 
 //----------------------------------------------------------------------------
@@ -250,6 +253,8 @@ MachiningsMgr::LoadGeneral( Scanner& TheScanner, bool& bEnd)
          bOk = FromString( sVal, m_dHoleDiamToler) ;
       else if ( ToUpper( sKey) == MF_EXTSAWARCMINRAD)
          bOk = FromString( sVal, m_dExtSawArcMinRad) ;
+      else if ( ToUpper( sKey) == MF_SPLITARCS)
+         bOk = FromString( sVal, m_nSplitArcs) ;
       else
          bOk = false ;
    }
@@ -422,6 +427,8 @@ MachiningsMgr::SaveGeneral( Writer& TheWriter) const
    bOk = bOk && TheWriter.OutText( sOut) ;
    sOut = MF_EXTSAWARCMINRAD + "=" + ToString( m_dExtSawArcMinRad) ;
    bOk = bOk && TheWriter.OutText( sOut) ;
+   sOut = MF_SPLITARCS + "=" + ToString( m_nSplitArcs) ;
+   bOk = bOk && TheWriter.OutText( sOut) ;
 
    return bOk ;
 }
@@ -951,3 +958,13 @@ MachiningsMgr::SetExtSawArcMinRad( double dRad)
    }
    return true ;
 }
+
+//----------------------------------------------------------------------------
+bool
+MachiningsMgr::SetSplitArcs( int nFlag)
+{
+   if ( nFlag < SPLAR_NEVER  ||  nFlag > SPLAR_ALWAYS)
+      return false ;
+   m_nSplitArcs = nFlag ;
+   return true ;
+}
diff --git a/MachiningsMgr.h b/MachiningsMgr.h
index b42d53c..143923a 100644
--- a/MachiningsMgr.h
+++ b/MachiningsMgr.h
@@ -68,6 +68,9 @@ class MachiningsMgr
       bool SetExtSawArcMinRad( double dRad) ;
       double GetExtSawArcMinRad( void)
                 { return m_dExtSawArcMinRad ; }
+      bool SetSplitArcs( int nFlag) ;
+      double GetSplitArcs( void)
+                { return m_nSplitArcs ; }
 
    private :
       bool Clear( void) ;
@@ -106,4 +109,5 @@ class MachiningsMgr
       double           m_dExtraROnDrillRegion ;
       double           m_dHoleDiamToler ;
       double           m_dExtSawArcMinRad ;
+      int              m_nSplitArcs ;
 } ;
\ No newline at end of file
diff --git a/Milling.cpp b/Milling.cpp
index b016b28..a1cc991 100644
--- a/Milling.cpp
+++ b/Milling.cpp
@@ -943,6 +943,22 @@ Milling::ProcessPath( int nPathId, int nPvId, int nClId)
    string sPathName ;
    m_pGeomDB->GetName( nPathId, sPathName) ;
 
+  // eventuale approssimazione con segmenti di linea
+
+   bool bSplitArcs = ( m_pMchMgr->GetCurrMachiningsMgr()->GetSplitArcs() == SPLAR_ALWAYS) ;
+   if ( bSplitArcs) {
+      const double ANG_TOL_MAX_DEG = 90 ;
+      PolyLine PL ;
+      if ( pCompo->ApproxWithLines( 50 * EPS_SMALL, ANG_TOL_MAX_DEG, ICurve::APL_SPECIAL, PL)) {
+        // sostituisco le linee alle curve originali
+         pCompo->Clear() ;
+         pCompo->FromPolyLine( PL) ;
+        // riassegno estrusione e spessore
+         pCompo->SetExtrusion( vtExtr) ;
+         pCompo->SetThickness( dThick) ;
+      }
+   }
+
   // verifiche sull'ampiezza dell'angolo al centro degli eventuali archi
    const double MAX_ANG_CEN = 150 + EPS_ANG_SMALL ;
    int nMaxInd = pCompo->GetCurveCount() - 1 ;
@@ -1041,7 +1057,7 @@ Milling::ProcessPath( int nPathId, int nPvId, int nClId)
          }
         // aggiungo attacco
          SetFeed( GetStartFeed()) ;
-         if ( ! AddLeadIn( ptP1, ptStart, vtStart, vtExtr)) {
+         if ( ! AddLeadIn( ptP1, ptStart, vtStart, vtExtr, bSplitArcs)) {
             LOG_INFO( GetEMkLogger(), "Error in Milling : LeadIn not computable") ;
             return false ;
          }
@@ -1075,7 +1091,7 @@ Milling::ProcessPath( int nPathId, int nPvId, int nClId)
         // aggiungo uscita
          Point3d ptP1 ;
          SetFeed( GetStartFeed()) ;
-         if ( ! AddLeadOut( ptEnd, vtEnd, vtExtr, ptP1)) {
+         if ( ! AddLeadOut( ptEnd, vtEnd, vtExtr, ptP1, bSplitArcs)) {
             LOG_INFO( GetEMkLogger(), "Error in Milling : LeadOut not computable") ;
             return false ;
          }
@@ -1181,9 +1197,19 @@ Milling::CalcLeadInStart( const Point3d& ptStart, const Vector3d& vtStart, const
 
 //----------------------------------------------------------------------------
 bool
-Milling::AddLeadIn( const Point3d& ptP1, const Point3d& ptStart, const Vector3d& vtStart, const Vector3d& vtN)
+Milling::AddLeadIn( const Point3d& ptP1, const Point3d& ptStart, const Vector3d& vtStart,
+                    const Vector3d& vtN, bool bSplitArcs)
 {
-   switch ( m_Params.m_nLeadInType) {
+  // assegno i parametri
+   int nType = m_Params.m_nLeadInType ;
+   if ( bSplitArcs) {
+      if ( nType == MILL_LI_TANGENT)
+         nType = MILL_LI_LINEAR ;
+      if ( nType == MILL_LI_HELIX)
+         nType = MILL_LI_LINEAR ;     // prevedere un nuovo tipo zig-zag
+   }
+  // eseguo a seconda del tipo
+   switch ( nType) {
    case MILL_LI_NONE :
       return true ;
    case MILL_LI_LINEAR :
@@ -1253,7 +1279,8 @@ Milling::AddLeadIn( const Point3d& ptP1, const Point3d& ptStart, const Vector3d&
 
 //----------------------------------------------------------------------------
 bool
-Milling::AddLeadOut( const Point3d& ptEnd, const Vector3d& vtEnd, const Vector3d& vtN, Point3d& ptP1)
+Milling::AddLeadOut( const Point3d& ptEnd, const Vector3d& vtEnd, const Vector3d& vtN,
+                     Point3d& ptP1, bool bSplitArcs)
 {
   // assegno i parametri
    int nType = m_Params.m_nLeadOutType ;
@@ -1264,6 +1291,10 @@ Milling::AddLeadOut( const Point3d& ptEnd, const Vector3d& vtEnd, const Vector3d
       dTang = m_Params.m_dLiTang ;
       dPerp = m_Params.m_dLiPerp ;
    }
+   if ( bSplitArcs) {
+      if ( nType == MILL_LO_TANGENT)
+         nType = MILL_LO_LINEAR ;
+   }
   // eseguo a seconda del tipo
    switch ( nType) {
    case MILL_LO_NONE :
diff --git a/Milling.h b/Milling.h
index 0f89933..c60a91e 100644
--- a/Milling.h
+++ b/Milling.h
@@ -68,8 +68,10 @@ class Milling : public Machining
       bool AddApproach( const Point3d& ptP, const Vector3d& vtTool, double dSafeZ, double dElev, double dAppr) ;
       bool AddRetract( const Point3d& ptP, const Vector3d& vtTool, double dSafeZ, double dElev, double dAppr) ;
       bool CalcLeadInStart( const Point3d& ptStart, const Vector3d& vtStart, const Vector3d& vtN, Point3d& ptP1) ;
-      bool AddLeadIn( const Point3d& ptP1, const Point3d& ptStart, const Vector3d& vtStart, const Vector3d& vtN) ;
-      bool AddLeadOut( const Point3d& ptEnd, const Vector3d& vtEnd, const Vector3d& vtN, Point3d& ptP1) ;
+      bool AddLeadIn( const Point3d& ptP1, const Point3d& ptStart, const Vector3d& vtStart,
+                      const Vector3d& vtN, bool bSplitArcs) ;
+      bool AddLeadOut( const Point3d& ptEnd, const Vector3d& vtEnd, const Vector3d& vtN,
+                       Point3d& ptP1, bool bSplitArcs) ;
 
    private :
       double GetSpeed() const