diff --git a/VolZmapVolume.cpp b/VolZmapVolume.cpp
index df6681a..afd7c95 100644
--- a/VolZmapVolume.cpp
+++ b/VolZmapVolume.cpp
@@ -4544,6 +4544,10 @@ VolZmap::CompCyl_Milling( int nGrid, const Point3d& ptS, const Point3d& ptE,
    double dLongLen = vtMoveLong.Len() ;
    double dOrtLen = vtMoveOrt.Len() ;
 
+  // Parametri di contenimento
+   Vector3d vtPerp = vtToolDir ^ Z_AX ; vtPerp.Normalize() ;
+   if ( vtPerp * vtMove < 0)
+      vtPerp.Invert() ;
    int nSkip = 0 ;
 
    for ( int i = nStartI ; i <= nEndI ; ++ i) {
@@ -4552,17 +4556,29 @@ VolZmap::CompCyl_Milling( int nGrid, const Point3d& ptS, const Point3d& ptE,
          Point3d ptC( ( i + 0.5) * m_dStep, ( j + 0.5) * m_dStep, 0) ;
 
         // salto il controllo degli spilloni sotto il piano limite in basso o sopra il piano limite in alto
-         if ( ( ptC - ptITip) * vtToolDir < -EPS_SMALL  &&
+         if ( ( ptC + Z_AX * m_dMinZ[nGrid] - ptITip) * vtToolDir < -EPS_SMALL  &&
               ( ptC + Z_AX * m_dMaxZ[nGrid] - ptITip) * vtToolDir < -EPS_SMALL) {
             ++ nSkip ;
             continue ;
          }
-         if ( ( ptC - ptI - vtMoveLong) * vtToolDir > EPS_SMALL &&
+         if ( ( ptC + Z_AX * m_dMinZ[nGrid] - ptI - vtMoveLong) * vtToolDir > EPS_SMALL &&
               ( ptC + Z_AX * m_dMaxZ[nGrid] - ptI - vtMoveLong) * vtToolDir > EPS_SMALL) {
             ++ nSkip ;
             continue ;
          }
 
+        // salto il controllo degli spilloni prima del piano di fianco verticale di inizio o dopo il piano di fianco verticale di fine
+         if ( ( ptC + Z_AX * m_dMinZ[nGrid] - ptI + vtPerp * dRad) * vtPerp < -EPS_SMALL  &&
+              ( ptC + Z_AX * m_dMaxZ[nGrid] - ptI + vtPerp * dRad) * vtPerp < -EPS_SMALL) {
+            ++ nSkip ;
+            continue ;
+         }
+         if ( ( ptC + Z_AX * m_dMinZ[nGrid] - ptF - vtPerp * dRad) * vtPerp > EPS_SMALL  &&
+              ( ptC + Z_AX * m_dMaxZ[nGrid] - ptF - vtPerp * dRad) * vtPerp > EPS_SMALL) {
+            ++ nSkip ;
+            continue ;
+         }
+
          Point3d ptInt1, ptInt2 ;
          Vector3d vtN1, vtN2 ;