diff --git a/EgtMachKernel.rc b/EgtMachKernel.rc
index f55ad18..fb07e83 100644
Binary files a/EgtMachKernel.rc and b/EgtMachKernel.rc differ
diff --git a/Milling.cpp b/Milling.cpp
index 3429cb0..2b5d7b1 100644
--- a/Milling.cpp
+++ b/Milling.cpp
@@ -4034,8 +4034,9 @@ Milling::AddSawZigZagMilling( const ICurveComposite* pCompo, const Vector3d& vtT
    }
    bool bAdjustLoPerp = ( m_Params.m_dLoPerp > 10 * EPS_SMALL) ;
    if ( bAdjustLoPerp) {
-      m_Params.m_dLoTang = 0 ;
-      m_Params.m_dLoPerp = 0. ;
+      double dNewLoPerp = max( 0., m_Params.m_dLoPerp - ( nStep - 1) * dStep) ;
+      m_Params.m_dLoTang *= dNewLoPerp / m_Params.m_dLoPerp ;
+      m_Params.m_dLoPerp = dNewLoPerp ;
    }
 
   // ciclo sugli step
@@ -4059,11 +4060,16 @@ Milling::AddSawZigZagMilling( const ICurveComposite* pCompo, const Vector3d& vtT
          if ( ! TrimExtendCurveToClosedStm( pMyCompo, nTriExtCstm, bInvert))
             pMyCompo.Set( pMyCopy) ;
       }
-     // dopo primo step annullo parametri di attacco
-      if ( j > 1  &&  bAdjustLiPerp) {
+     // se necessario e invertito oppure step successivo annullo parametri di attacco
+      if ( bAdjustLiPerp  &&  ( bInvert  ||  j == 2)) {
          m_Params.m_dLiPerp = 0. ;
          m_Params.m_dLiTang = 0. ;
       }
+     // se necessario e non invertito oppure step successivo annullo parametri di uscita
+      if ( bAdjustLoPerp  &&  ( ! bInvert  ||  j == 2)) {
+         m_Params.m_dLoPerp = 0. ;
+         m_Params.m_dLoTang = 0. ;
+      }
      // ciclo sulle curve elementari
       int nMaxInd = pMyCompo->GetCurveCount() - 1 ;
       for ( int i = 0 ; i <= nMaxInd ; ++ i) {