diff --git a/SurfRoughing.cpp b/SurfRoughing.cpp
index ff7666b..9a4d783 100644
--- a/SurfRoughing.cpp
+++ b/SurfRoughing.cpp
@@ -30,6 +30,7 @@
 #include "/EgtDev/Include/EGkSurfTriMesh.h"
 #include "/EgtDev/Include/EGkSurfBezier.h"
 #include "/EgtDev/Include/EGkSfrCreate.h"
+#include "/EgtDev/Include/EGkStmStandard.h"
 #include "/EgtDev/Include/EGkCalcPocketing.h"
 #include "/EgtDev/Include/EGkSurfLocal.h"
 #include "/EgtDev/Include/EGkCAvSilhouetteSurfTm.h"
@@ -2332,75 +2333,73 @@ SurfRoughing::GetToolCollisionRegion( const ISurfFlatRegion* pSfrSgro, double& d
   // definisco la distanza di sicurezza
    double const SAFE_TOL = 5. * EPS_SMALL ;
 
-  // --- tavola
-   BBox3d b3Area ; // z = 0
-   if ( m_pMchMgr->GetTableArea( 1, b3Area)  &&  ! b3Area.IsEmpty()) {
-      // caso sgrossatura in Z
-      if ( AreSameVectorApprox( pSfrSgro->GetNormVersor(), Z_AX)) {
-        // controllo se limitare la Depth della tavola
-         double dTabDist = abs( ( ptCen - b3Area.GetMax()) * pSfrSgro->GetNormVersor()) ;
-         if ( dDepth > dTabDist - DIST_TABLE) {
-            dDepth = dTabDist - DIST_TABLE ;
-            string sWarn = "Warning in SurfRoughing : Depth reduced at " + ToString( dDepth, 3) ;
-            m_pMchMgr->SetWarning( 3057, sWarn) ;
-         }
-      }
-     // se orientamento diverso dalla tavola
-      else {
-        // recupero la TriMesh di espansione per evitare collisioni
-         double dTmpTabThick = 0.1 * ( min( b3Area.GetDimX(), b3Area.GetDimY())) ;
-         b3Area.Expand( SAFE_TOL, SAFE_TOL, 0.) ;
-         PtrOwner<ICurveComposite> pCompoTab( CreateCurveComposite()) ;
-         if ( IsNull( pCompoTab))
-            return false ;
-         pCompoTab->AddPoint( b3Area.GetMin()) ;
-         pCompoTab->AddLine( b3Area.GetMin() + X_AX * b3Area.GetDimX()) ;
-         pCompoTab->AddLine( b3Area.GetMax() - Z_AX * b3Area.GetDimZ()) ;
-         pCompoTab->AddLine( b3Area.GetMin() + Y_AX * b3Area.GetDimY()) ;
-         pCompoTab->Close() ;
-         pCompoTab->Translate( - Z_AX * ( dTmpTabThick + SAFE_TOL)) ;
-         #if ENABLE_DEBUG_SFR_COLLISION
-            ICurveComposite* _pCompoBox = CloneCurveComposite( pCompoTab) ;
-            _pCompoBox->SetExtrusion( Z_AX) ;
-            _pCompoBox->SetThickness( dTmpTabThick + 2. * SAFE_TOL) ;
-            int _nTbId = m_pGeomDB->AddGeoObj( GDB_ID_NULL, GDB_ID_ROOT, _pCompoBox) ;
-            m_pGeomDB->SetMaterial( _nTbId, RED) ;
-         #endif
-         CICURVEPVECTOR vpCrvs ;
-         vpCrvs.emplace_back( pCompoTab) ;
-         PtrOwner<ISurfTriMesh> pStmCollTab( GetSurfTriMeshByRegionExtrusion( vpCrvs, Z_AX * ( dTmpTabThick + 2. * SAFE_TOL))) ;
-         if ( IsNull( pStmCollTab)  ||  ! pStmCollTab->IsValid()  ||  pStmCollTab->GetTriangleCount() == 0)
-            return false ;
-        // recupero la sua proiezione nel piano di sgrossatura come regione piana
-         Plane3d plProj ;
-         if ( ! plProj.Set( frLoc.Orig() - dDepth * frLoc.VersZ(), frLoc.VersZ()))
-            return false ;
-         POLYLINEVECTOR vPL ;
-         if ( ! pStmCollTab->GetSilhouette( plProj, EPS_SMALL, vPL)) // proiezione di 6 triangoli, veloce
-            return false ;
-        // se completamente dietro al piano, non influenza la sgrossatura attuale
-         if ( ! vPL.empty()) {
-            SurfFlatRegionByContours SfrByC ;
-            for ( const PolyLine& PL : vPL) {
-               PtrOwner<ICurveComposite> pCompoLoop( CreateCurveComposite()) ;
-               if ( IsNull( pCompoLoop)  ||  ! pCompoLoop->FromPolyLine( PL)  ||
-                    ! SfrByC.AddCurve( Release( pCompoLoop)))
-                  return false ;
+  // Recupero la macchina corrente e gli oggetti di Collisione
+   Machine* pMch = m_pMchMgr->GetCurrMachine() ;
+   if ( pMch != nullptr) {
+      INTVECTOR vTabCollId ;
+      if ( pMch->GetCurrTableCollGroups( vTabCollId)) {
+         for ( const int& nCollId : vTabCollId) {
+           // recupero il Box dell'Oggetto
+            BBox3d BBoxTab ;
+            if ( ! m_pGeomDB->GetGlobalBBox( nCollId, BBoxTab)  ||  BBoxTab.IsEmpty())
+               continue ;
+           // se sgrossatura orientata come la Tavola, quindi Z_AX
+            if ( AreSameVectorApprox( pSfrSgro->GetNormVersor(), Z_AX)) {
+              // controllo se limitare la Depth della tavola
+               double dTabDist = abs( ( ptCen - BBoxTab.GetMax()) * pSfrSgro->GetNormVersor()) ;
+               if ( dDepth > dTabDist - DIST_TABLE) {
+                  dDepth = dTabDist - DIST_TABLE ;
+                  string sWarn = "Warning in SurfRoughing : Depth reduced at " + ToString( dDepth, 3) ;
+                  m_pMchMgr->SetWarning( 3057, sWarn) ;
+               }
+            }
+           // altrimenti
+            else {
+              // espando leggermente il Box per tolleranze
+               BBoxTab.Expand( SAFE_TOL) ;
+              // creo una TriMesh rappresentativa del Box
+               double dDimX = BBoxTab.GetDimX() ;
+               double dDimY = BBoxTab.GetDimY() ;
+               double dDimZ = BBoxTab.GetDimZ() ;
+               PtrOwner<ISurfTriMesh> pStmBox( GetSurfTriMeshBox( dDimX, dDimY, dDimZ, true)) ;
+               if ( IsNull( pStmBox)  ||  ! pStmBox->IsValid())
+                  continue ;
+               Point3d ptBoxC ; BBoxTab.GetCenter( ptBoxC) ;
+               Point3d ptStmC = Point3d( dDimX / 2., dDimY / 2., dDimZ / 2.) ;
+               pStmBox->Translate( ptStmC - ptBoxC) ;
+              // recupero la sua proiezione nel piano di sgrossatura come regione piana
+              // NB. Usando il piano, non considero la parte di superifie nel semipiano negativo
+               Plane3d plProj ;
+               if ( ! plProj.Set( frLoc.Orig() - dDepth * frLoc.VersZ(), frLoc.VersZ()))
+                  return false ;
+               POLYLINEVECTOR vPL ;
+               if ( ! pStmBox->GetSilhouette( plProj, EPS_SMALL, vPL))
+                  return false ;
+              // se esiste una proiezione nel semipiano positivo, ne recupero la regione piana
+               if ( ! vPL.empty()) {
+                  SurfFlatRegionByContours SfrByC ;
+                  for ( const PolyLine& PL : vPL) {
+                     PtrOwner<ICurveComposite> pCompoLoop( CreateCurveComposite()) ;
+                     if ( IsNull( pCompoLoop)  ||  ! pCompoLoop->FromPolyLine( PL)  ||
+                          ! SfrByC.AddCurve( Release( pCompoLoop)))
+                        return false ;
+                  }
+                  PtrOwner<ISurfFlatRegion> pSfrTabColl( SfrByC.GetSurf()) ;
+                  if ( IsNull( pSfrTabColl)  ||  ! pSfrTabColl->IsValid())
+                     return false ;
+                 // aggiorno la regione di collissione per l'utensile
+                  if ( ! pSfrColl->CopyFrom( pSfrTabColl))
+                     return false ;
+                  if ( AreOppositeVectorApprox( pSfrColl->GetNormVersor(), frLoc.VersZ()))
+                     pSfrColl->Invert() ;
+                  #if ENABLE_DEBUG_SFR_COLLISION
+                     ISurfFlatRegion* _pSfrTab = CreateSurfFlatRegion() ;
+                     _pSfrTab->CopyFrom( pSfrColl) ;
+                     int _nSrfTbId = m_pGeomDB->AddGeoObj( GDB_ID_NULL, GDB_ID_ROOT, _pSfrTab) ;
+                     m_pGeomDB->SetMaterial( _nSrfTbId, Color( 255, 0, 0, 50)) ;
+                  #endif
+               }
             }
-            PtrOwner<ISurfFlatRegion> pSfrTabColl( SfrByC.GetSurf()) ;
-            if ( IsNull( pSfrTabColl)  ||  ! pSfrTabColl->IsValid())
-               return false ;
-           // aggiorno la regione di collissione per l'utensile
-            if ( ! pSfrColl->CopyFrom( pSfrTabColl))
-               return false ;
-            if ( AreOppositeVectorApprox( pSfrColl->GetNormVersor(), frLoc.VersZ()))
-               pSfrColl->Invert() ;
-            #if ENABLE_DEBUG_SFR_COLLISION
-               ISurfFlatRegion* _pSfrTab = CreateSurfFlatRegion() ;
-               _pSfrTab->CopyFrom( pSfrColl) ;
-               int _nSrfTbId = m_pGeomDB->AddGeoObj( GDB_ID_NULL, GDB_ID_ROOT, _pSfrTab) ;
-               m_pGeomDB->SetMaterial( _nSrfTbId, Color( 255, 0, 0, 50)) ;
-            #endif
          }
       }
    }