diff --git a/EgtMachKernel.rc b/EgtMachKernel.rc
index 69591e1..a8e5e83 100644
Binary files a/EgtMachKernel.rc and b/EgtMachKernel.rc differ
diff --git a/Operation.cpp b/Operation.cpp
index 8f642c2..6457bda 100644
--- a/Operation.cpp
+++ b/Operation.cpp
@@ -2345,9 +2345,10 @@ Operation::TestCollisionAvoid( const DBLVECTOR& vAxStart, const DBLVECTOR& vAxEn
    INTVECTOR vCollId ;
    pMch->GetCurrHeadCollGroups( vCollId) ;
   // distanza di sicurezza
+   const double TOL_SAFEDIST = 10.0 ;
    const double MIN_SAFEDIST = 10.0 ;
    double dSafeDist = m_pMchMgr->GetCurrMachiningsMgr()->GetSafeZ() ;
-   dSafeDist = min( dSafeDist, max( 0.5 * dSafeDist, MIN_SAFEDIST)) ;
+   dSafeDist = max( dSafeDist - TOL_SAFEDIST, MIN_SAFEDIST) ;
   // Vado nelle posizioni da controllare
    const int COLL_STEP = 16 ;
    bool bCollide = false ;
diff --git a/Sawing.cpp b/Sawing.cpp
index b1039e2..65d8354 100644
--- a/Sawing.cpp
+++ b/Sawing.cpp
@@ -2022,10 +2022,8 @@ Sawing::GenerateLineCl( const ICurveLine* pLine, const Vector3d& vtTool, const V
    SetCorrAuxDir( vtCorr) ;
   // recupero distanza di sicurezza
    double dSafeZ = m_pMchMgr->GetCurrMachiningsMgr()->GetSafeZ() ;
-  // lunghezza di approccio/retrazione
+  // distanza di approccio/retrazione
    double dAppr = m_Params.m_dStartPos ;
-   if ( abs( m_Params.m_dSideAngle) > EPS_ANG_SMALL)
-      dAppr /= cos( m_Params.m_dSideAngle * DEGTORAD) ;
   // valori di step
    double dActStep = m_Params.m_dStep ;
    double dActBstep = GetStepBack() ;
@@ -2195,12 +2193,12 @@ Sawing::GenerateLineCl( const ICurveLine* pLine, const Vector3d& vtTool, const V
          if ( i != 0) {
            // movimento di risalita sopra il punto finale
             SetFeed( GetEndFeed()) ;
-            Point3d ptP4 = pLine->GetEnd() + vtCorr * ( dElev + dAppr) ;
+            Point3d ptP4 = pLine->GetEnd() + vtCorr * ( dElev + dAppr / vtCorr.z) ;
             if ( AddLinearMove( ptP4) == GDB_ID_NULL)
                return false ;
            // movimento di ritorno spora il punto iniziale
             SetFeed( GetEndFeed()) ;
-            Point3d ptP5 = pLine->GetStart() + vtCorr * ( dElev + dAppr) ;
+            Point3d ptP5 = pLine->GetStart() + vtCorr * ( dElev + dAppr / vtCorr.z) ;
             if ( AddLinearMove( ptP5) == GDB_ID_NULL)
                return false ;
          }
@@ -2966,10 +2964,10 @@ Sawing::GenerateExtCurveCl( const ICurveComposite* pCrv,
            // ricavo punto di risalita e punto iniziale
             Point3d ptP4 ;
             pCrv->GetEndPoint( ptP4) ;
-            ptP4 += vtEndCorr * ( dElev + dAppr) ;
+            ptP4 += vtEndCorr * ( dElev + dAppr / vtEndCorr.z) ;
             Point3d ptP5 ;
             pCrv->GetStartPoint( ptP5) ;
-            ptP5 += vtStaCorr * ( dElev + dAppr) ;
+            ptP5 += vtStaCorr * ( dElev + dAppr / vtStaCorr.z) ;
            // se sono diversi o le direzioni utensile sono diverse
             if ( ! AreSamePointApprox( ptP4, ptP5)  ||
                  ! AreSameVectorApprox( vtEndTool, vtStaTool)) {