diff --git a/VolZmapVolume.cpp b/VolZmapVolume.cpp
index 6fba426..c802d37 100644
--- a/VolZmapVolume.cpp
+++ b/VolZmapVolume.cpp
@@ -1807,7 +1807,11 @@ VolZmap::GenTool_ZDrilling( int nGrid, const Point3d& ptS, const Point3d& ptE, c
          Point3d ptCenS = ptI - vtToolDir * ( ptStart.y - ptCen.y) ;
          Point3d ptCenE = ptCenS + vtMove ;
         // Eseguo l'asportazione del materiale
-         CompBall_Milling( nGrid, ptCenS, ptCenE, dRadius) ;
+         if ( m_Tool.GetCuttingFlag())
+            CompBall_Milling( nGrid, ptCenS, ptCenE, dRadius) ;
+         else if ( pCurve->GetTempProp( 1) == 1) {
+            /*SurfSpherePart_Milling( nGrid, ptCenS, ptCenS, vtToolDir, dRadius, double dInfH, double dSupH, bool bOuterCutter)*/ ;      
+         }
         // aggiorno l'altezza
          //dHeight = abs( ptStart.y - ptEnd.y) ;
       }