diff --git a/VolZmapVolume.cpp b/VolZmapVolume.cpp
index 37962a6..412a668 100644
--- a/VolZmapVolume.cpp
+++ b/VolZmapVolume.cpp
@@ -864,6 +864,8 @@ GetCylMoveRotBBox( const Point3d& ptP1, const Point3d& ptP2, const Vector3d& vtV
 
    Vector3d vtDirTop = ptP2 - ptP1 ;
    Vector3d vtDirTip = ptP2T - ptP1T ;
+   vtDirTop.Normalize() ;
+   vtDirTip.Normalize() ;
 
   // determino i punti laterali del top e del bottom(tip), nella posizione di partenza
    Vector3d vtAuxTopS = vtV1 ^ vtDirTop ;
@@ -2376,7 +2378,7 @@ VolZmap::MillingGeneralMotionStep( const Point3d& ptPs, const Vector3d& vtDs, co
                                    const Point3d& ptPe, const Vector3d& vtDe, const Vector3d& vtAe)
 {
   // Flag per impostare vecchia (approssimativa) o nuova modalità di calcolo
-   constexpr bool OLD_LINEAR = true ;
+   constexpr bool OLD_LINEAR = false ;
 
   // Deve essere definito l'utensile corrente
    if ( m_nCurrTool < 0  ||  m_nCurrTool >= int( m_vTool.size()))
@@ -2473,8 +2475,12 @@ VolZmap::MillingGeneralMotionStep( const Point3d& ptPs, const Vector3d& vtDs, co
       else
          n5AxisType = Move5Axis::NO_BASE_INTERS ;
    }
-   else if ( bAlong)
-      n5AxisType = Move5Axis::NO_BASE_INTERS ;
+   else if (bAlong) {
+       if (bAlongInters)
+           n5AxisType = Move5Axis::ACROSS;
+       else
+           n5AxisType = Move5Axis::NO_BASE_INTERS;
+   }
 
    Point3d ptLs[N_MAPS] ;
    Point3d ptLe[N_MAPS] ;