diff --git a/Chiseling.cpp b/Chiseling.cpp
index 4094ee0..1869892 100644
--- a/Chiseling.cpp
+++ b/Chiseling.cpp
@@ -1030,7 +1030,7 @@ Chiseling::ProcessPath( int nPathId, int nPvId, int nClId)
      // valore offset 
       double dSignOffs = ( m_Params.m_nWorkSide == CHISEL_WS_RIGHT) ? dOffs : - dOffs ;
      // flag offset
-      int nFlag = ICurve::OFF_EXTEND ;
+      int nFlag = ICurve::OFF_EXTEND | ICurve::OFF_MEDIA_INTDZ ;
       // se percorso chiuso senza overlap ed inizio/fine è un angolo esterno
       if ( pCompo->IsClosed()) {
          Vector3d vtStart, vtEnd ;
@@ -1143,10 +1143,18 @@ Chiseling::ProcessPath( int nPathId, int nPvId, int nClId)
      // devono essere due rette
       if ( pPrevCrv->GetType() == CRV_LINE  &&  pCurrCrv->GetType() == CRV_LINE) {
         // devono essere abbastanza lunghe e formare un angolo retto dalla parte della correzione
-         double dPrevLen ; pPrevCrv->GetLength( dPrevLen) ;
-         double dCurrLen ; pCurrCrv->GetLength( dCurrLen) ;
-         Vector3d vtPrevDir ; pPrevCrv->GetEndDir( vtPrevDir) ;
-         Vector3d vtCurrDir ; pCurrCrv->GetStartDir( vtCurrDir) ;
+         double dPrevLen ;
+         pPrevCrv->GetLength( dPrevLen) ;
+         double dCurrLen ;
+         pCurrCrv->GetLength( dCurrLen) ;
+         Vector3d vtPrevDir ;
+         pPrevCrv->GetEndDir( vtPrevDir) ;
+         vtPrevDir -= ( vtPrevDir * vtExtr) * vtExtr ;
+         vtPrevDir.Normalize() ;
+         Vector3d vtCurrDir ;
+         pCurrCrv->GetStartDir( vtCurrDir) ;
+         vtCurrDir -= ( vtCurrDir * vtExtr) * vtExtr ;
+         vtCurrDir.Normalize() ;
          double dProVett = ( vtPrevDir ^ vtCurrDir) * vtExtr ;
          const double SIN_ANG_LIM = sin( ( ANG_RIGHT - 100 * EPS_ANG_SMALL) * DEGTORAD) ;
          if ( dPrevLen > 0.5 * m_TParams.m_dDiam - EPS_SMALL  &&
diff --git a/EgtMachKernel.rc b/EgtMachKernel.rc
index 88d4e72..4cb8c28 100644
Binary files a/EgtMachKernel.rc and b/EgtMachKernel.rc differ