diff --git a/EgtMachKernel.rc b/EgtMachKernel.rc
index fea7b8c..0722d82 100644
Binary files a/EgtMachKernel.rc and b/EgtMachKernel.rc differ
diff --git a/Operation.cpp b/Operation.cpp
index 3b2c772..66c7f2c 100644
--- a/Operation.cpp
+++ b/Operation.cpp
@@ -2930,7 +2930,7 @@ Operation::CalcDeltaZForHeadRotation( const DBLVECTOR& vAxStart, const DBLVECTOR
 bool
 Operation::GetExtraZ( const DBLVECTOR& vAx1, const Vector3d& vtTool1,
                       const DBLVECTOR& vAx2, const Vector3d& vtTool2,
-                      double dSafeZ, double& dExtraZ) const
+                      double dHomeZ, double& dExtraZ) const
 {
   // Recupero macchina corrente
    Machine* pMch = ( m_pMchMgr != nullptr ?  m_pMchMgr->GetCurrMachine() : nullptr) ;
@@ -2952,12 +2952,12 @@ Operation::GetExtraZ( const DBLVECTOR& vAx1, const Vector3d& vtTool1,
    if ( SpecialGetMaxZ( vAx1, vtTool1, vAx2, vtTool2, dMaxZ)) {
      // se caso standard
       if ( ! bZHomeDown) {
-         dExtraZ = min( dMaxZ, dAxZmax) - dSafeZ ;
+         dExtraZ = min( dMaxZ, dAxZmax) - dHomeZ ;
          return ( dExtraZ > EPS_SMALL) ;
       }
      // altrimenti caso con posizione sicura in basso (teste da sotto)
       else {
-         dExtraZ = max( dMaxZ, dAxZmin) - dSafeZ ;
+         dExtraZ = max( dMaxZ, dAxZmin) - dHomeZ ;
          return ( dExtraZ < EPS_SMALL) ;
       }
    }
@@ -2982,14 +2982,14 @@ Operation::GetExtraZ( const DBLVECTOR& vAx1, const Vector3d& vtTool1,
       if ( ! bZHomeDown) {
          double dZmax ;
          pMch->GetCurrAxisMax( 2, dZmax) ;
-         dExtraZ = min( vdVal[0], dZmax - dSafeZ) ;
+         dExtraZ = min( vdVal[0], dZmax - dHomeZ) ;
          return ( dExtraZ > EPS_SMALL) ;
       }
      // altrimenti caso con posizione sicura in basso (teste da sotto)
       else {
          double dZmin ;
          pMch->GetCurrAxisMin( 2, dZmin) ;
-         dExtraZ = max( vdVal[0], dZmin - dSafeZ) ;
+         dExtraZ = max( vdVal[0], dZmin - dHomeZ) ;
          return ( dExtraZ < EPS_SMALL) ;
       }
    }
diff --git a/Operation.h b/Operation.h
index a841f84..84bb986 100644
--- a/Operation.h
+++ b/Operation.h
@@ -136,7 +136,7 @@ class Operation : public IUserObj
       bool   CalcDeltaZForHeadRotation( const DBLVECTOR& vAxStart, const DBLVECTOR& vAxEnd, double& dDeltaZ) const ;
       bool   GetExtraZ( const DBLVECTOR& vAx1, const Vector3d& vtTool1,
                         const DBLVECTOR& vAx2, const Vector3d& vtTool2,
-                        double dSafeZ, double& dExtraZ) const ;
+                        double dHomeZ, double& dExtraZ) const ;
       bool   SpecialGetMaxZ( const DBLVECTOR& vAx1, const Vector3d& vtTool1,
                              const DBLVECTOR& vAx2, const Vector3d& vtTool2,
                              double& dMaxZ) const ;