diff --git a/EgtMachKernel.rc b/EgtMachKernel.rc
index 166cf40..09b0dd0 100644
Binary files a/EgtMachKernel.rc and b/EgtMachKernel.rc differ
diff --git a/Operation.cpp b/Operation.cpp
index 0a1eb23..4429703 100644
--- a/Operation.cpp
+++ b/Operation.cpp
@@ -842,6 +842,29 @@ Operation::GetRawGlobBox( int nPhase, const BBox3d& b3Test, double dToler, BBox3
    return true ;
 }
 
+//----------------------------------------------------------------------------
+bool
+Operation::GetCurrRawsGlobBox( BBox3d& b3Raw) const
+{
+   if ( m_pMchMgr == nullptr  ||  m_pGeomDB == nullptr)
+      return false ;
+  // inizializzo box
+   b3Raw.Reset() ;
+  // Ciclo sui grezzi attivi
+   int nRawId = m_pMchMgr->GetFirstRawPart() ;
+   while ( nRawId != GDB_ID_NULL) {
+      if ( m_pMchMgr->VerifyRawPartPhase( nRawId, m_nPhase)) {
+         BBox3d b3OneRaw ;
+         int nRawSolidId = m_pGeomDB->GetFirstNameInGroup( nRawId, MACH_RAW_SOLID) ;
+         if ( m_pGeomDB->GetGlobalBBox( nRawSolidId, b3OneRaw)) {
+            b3Raw.Add( b3OneRaw) ;
+         }
+      }
+      nRawId = m_pMchMgr->GetNextRawPart( nRawId) ;
+   }
+   return true ;
+}
+
 //----------------------------------------------------------------------------
 //----------------------------------------------------------------------------
 inline Vector3d
@@ -2193,12 +2216,15 @@ Operation::AdjustStartEndMovements( bool bVerifyPreviousLink)
             else
                return false ;
          }
+        // Recupero box complessivo dei grezzi attivi
+         BBox3d b3Raws ;
+         GetCurrRawsGlobBox( b3Raws) ;
         // Se già a Zmax
          if ( bMaxZ) {
            // non devo fare alcunché
          }
         // se altrimenti richiesta risalita a Zmax
-         else if ( bToZmax  ||  ForcedZmax( vAxVal, vAxIni)) {
+         else if ( bToZmax  ||  ForcedZmax( vAxVal, vAxIni, b3Raws)) {
            // cancello eventuale risalita parziale della lavorazione precedente
             pPrevOp->RemoveRise() ;
            // aggiungo risalita a Zmax
@@ -2429,6 +2455,9 @@ Operation::AdjustOneStartMovement( int nClPathId, int nPrevClPathId, Operation*
    }
   // verifico se la testa interferisce con i pezzi o i bloccaggi sulla tavola
    else {
+     // Recupero box complessivo dei grezzi attivi
+      BBox3d b3Raws ;
+      GetCurrRawsGlobBox( b3Raws) ;
      // recupero se ZHome è in basso
       bool bZHomeDown = GetZHomeDown() ;
      // determino la Z più alta tra le due posizioni
@@ -2437,7 +2466,7 @@ Operation::AdjustOneStartMovement( int nClPathId, int nPrevClPathId, Operation*
       DBLVECTOR vAxPrevTmp = vAxPrev ; vAxPrevTmp[2] = dTopZ ;
       DBLVECTOR vAxCurrTmp = vAxCurr ; vAxCurrTmp[2] = dTopZ ;
      // verifico se forzata risalita a Zmax
-      bool bForcedZMax = ForcedZmax( vAxPrevTmp, vAxCurrTmp) ;
+      bool bForcedZMax = ForcedZmax( vAxPrevTmp, vAxCurrTmp, b3Raws) ;
      // se interferisce
       if ( bForcedZMax  ||  ! TestCollisionAvoid( vAxPrevTmp, vAxCurrTmp)) {
         // recupero HomeZ
@@ -3112,7 +3141,7 @@ Operation::GetRotationAtZmax( void) const
 
 //----------------------------------------------------------------------------
 bool
-Operation::ForcedZmax( const DBLVECTOR& vAxStart, const DBLVECTOR& vAxEnd) const
+Operation::ForcedZmax( const DBLVECTOR& vAxStart, const DBLVECTOR& vAxEnd, const BBox3d& b3Raws) const
 {
   // Recupero macchina corrente
    Machine* pMch = ( m_pMchMgr != nullptr ?  m_pMchMgr->GetCurrMachine() : nullptr) ;
@@ -3130,6 +3159,13 @@ Operation::ForcedZmax( const DBLVECTOR& vAxStart, const DBLVECTOR& vAxEnd) const
    int nHeadId = pMch->GetCurrHead() ;
    DBLVECTOR vdVal ;
    if ( m_pGeomDB->GetInfo( nHeadId, MCH_ZMAXONROT, vdVal) && vdVal.size() >= 1  &&  lround(vdVal[0]) > 0) {
+     // controllo altezza minima grezzi
+      double dHmin = 100 * EPS_SMALL ;
+      if ( vdVal.size() >= 3)
+         dHmin = max( vdVal[2], dHmin) ;
+      if ( b3Raws.GetDimZ() < dHmin)
+         return false ;
+     // controllo variazione angolare minima
       double dAngTol = 100 * EPS_ANG_SMALL ;
       if ( vdVal.size() >= 2)
          dAngTol = max( vdVal[1], dAngTol) ;
diff --git a/Operation.h b/Operation.h
index b98a570..7a02b3f 100644
--- a/Operation.h
+++ b/Operation.h
@@ -99,6 +99,7 @@ class Operation : public IUserObj
       bool   GetDistanceFromRawBottom( int nPhase, int nPathId, double dToler, double& dRbDist, double& dAllRbDist) const ;
       bool   GetRawGlobBox( int nPhase, int nPathId, double dToler, BBox3d& b3Raw) const ;
       bool   GetRawGlobBox( int nPhase, const BBox3d& b3Test, double dToler, BBox3d& b3Raw) const ;
+      bool   GetCurrRawsGlobBox( BBox3d& b3Raw) const ;
 
       bool   AdjustCurveFromSurf( ICurveComposite* pCrvCompo, int nToolDir, int nFaceUse, double dToolThick, int nGrade = 3) ;
       bool   ApproxWithArcsIfUseful( ICurveComposite* pCompo, bool bCareTempProp = false) const ;
@@ -144,7 +145,7 @@ class Operation : public IUserObj
                              const DBLVECTOR& vAx2, const Vector3d& vtTool2,
                              double& dMaxZ) const ;
       bool   GetRotationAtZmax( void) const ;
-      bool   ForcedZmax( const DBLVECTOR& vAxStart, const DBLVECTOR& vAxEnd) const ;
+      bool   ForcedZmax( const DBLVECTOR& vAxStart, const DBLVECTOR& vAxEnd, const BBox3d& b3Raws) const ;
       int    GetUserNotesZmax( void) const ;
       bool   GetZHomeDown( void) const ;
       bool   TestCollisionAvoid( const DBLVECTOR& vAxStart, const DBLVECTOR& vAxEnd) const ;