diff --git a/MachMgr.h b/MachMgr.h
index 7442ada..4aa8569 100644
--- a/MachMgr.h
+++ b/MachMgr.h
@@ -328,9 +328,9 @@ class MachMgr : public IMachMgr
       bool GetClEntAxesStatus( int nEntId, int& nStatus) const override ;
       bool GetClEntAxesMask( int nEntId, int& nMask) const override ;
       bool GetClEntAxesVal( int nEntId, DBLVECTOR& vAxes) const override ;
-      bool GetClEntTDir( int nEntId, Vector3d& vTDir) const override ;
-      bool GetClEntCDir( int nEntId, Vector3d& vCDir) const override ;
-      bool GetClEntADir( int nEntId, Vector3d& vADir) const override ;
+      bool GetClEntTDir( int nEntId, Vector3d& vtTDir) const override ;
+      bool GetClEntCDir( int nEntId, Vector3d& vtCDir) const override ;
+      bool GetClEntADir( int nEntId, Vector3d& vtADir) const override ;
      // Simulation
       bool SimInit( void) override ;
       bool SimStart( bool bFirst) override ;
diff --git a/MachMgrClEntities.cpp b/MachMgrClEntities.cpp
index 290605e..78c75f1 100644
--- a/MachMgrClEntities.cpp
+++ b/MachMgrClEntities.cpp
@@ -150,10 +150,10 @@ MachMgr::GetClEntAxesVal( int nEntId, DBLVECTOR& vAxes) const
 
 //----------------------------------------------------------------------------
 bool
-MachMgr::GetClEntTDir( int nEntId, Vector3d& vTDir) const
+MachMgr::GetClEntTDir( int nEntId, Vector3d& vtTDir) const
 {
   // default
-   vTDir = V_NULL ;
+   vtTDir = V_NULL ;
   // verifico validità GeomBD
    if ( m_pGeomDB == nullptr)
       return false ;
@@ -161,17 +161,17 @@ MachMgr::GetClEntTDir( int nEntId, Vector3d& vTDir) const
    const CamData* pCamData = GetCamData( m_pGeomDB->GetUserObj( nEntId)) ;
    if ( pCamData == nullptr)
       return false ;
-  // recupero vTDir
-   vTDir = pCamData->GetToolDir() ;
+  // recupero TDir
+   vtTDir = pCamData->GetToolDir() ;
    return true ;
 }
 
 //----------------------------------------------------------------------------
 bool
-MachMgr::GetClEntCDir( int nEntId, Vector3d& vCDir) const
+MachMgr::GetClEntCDir( int nEntId, Vector3d& vtCDir) const
 {
   // default
-   vCDir = V_NULL ;
+   vtCDir = V_NULL ;
   // verifico validità GeomDB
    if ( m_pGeomDB == nullptr)
       return false ;
@@ -179,17 +179,17 @@ MachMgr::GetClEntCDir( int nEntId, Vector3d& vCDir) const
    const CamData* pCamData = GetCamData( m_pGeomDB->GetUserObj( nEntId)) ;
    if ( pCamData == nullptr)
       return false ;
-  // recupero vCDir
-   vCDir = pCamData->GetCorrDir() ;
+  // recupero CDir
+   vtCDir = pCamData->GetCorrDir() ;
    return true ;
 }
 
 //----------------------------------------------------------------------------
 bool
-MachMgr::GetClEntADir( int nEntId, Vector3d& vADir) const
+MachMgr::GetClEntADir( int nEntId, Vector3d& vtADir) const
 {
   // default
-   vADir = V_NULL ;
+   vtADir = V_NULL ;
   // verifico validità GeomDB
    if ( m_pGeomDB == nullptr)
       return false ;
@@ -198,6 +198,6 @@ MachMgr::GetClEntADir( int nEntId, Vector3d& vADir) const
    if ( pCamData == nullptr)
       return false ;
   // recupero ADir
-   vADir = pCamData->GetAuxDir() ;
+   vtADir = pCamData->GetAuxDir() ;
    return true ;
 }
diff --git a/Operation.cpp b/Operation.cpp
index 12a79bb..5feeadf 100644
--- a/Operation.cpp
+++ b/Operation.cpp
@@ -2214,8 +2214,8 @@ Operation::MyCalculateClPathMcentAxesValues( int nClPathId, double dAngDeltaMinF
                double dCoeff = double( i) / nNumStep ;
                Point3d ptCurr = Media( ptPrec, ptP, dCoeff) ;
                DBLVECTOR vAng( vAxRot.size()) ;
-               for ( int i = 0 ; i < int( vAxRot.size()) ; ++ i)
-                  vAng[i] = vAxRotPrec[i] * ( 1 - dCoeff) + vAxRot[i] * dCoeff ;
+               for ( int j = 0 ; j < ssize( vAxRot) ; ++ j)
+                  vAng[j] = vAxRotPrec[j] * ( 1 - dCoeff) + vAxRot[j] * dCoeff ;
                int nStat = 0 ;
                bool bPaOk = pMachine->VerifyProtectedAreas( ptCurr.x, ptCurr.y, ptCurr.z, vAng, nStat) ;
                if ( ! bPaOk  ||  nStat != 0) {
@@ -2240,8 +2240,8 @@ Operation::MyCalculateClPathMcentAxesValues( int nClPathId, double dAngDeltaMinF
          ptMid.Rotate( ptCen, vtN, - dAngCen / 2) ;
         // determino i valori degli assi al punto medio
          DBLVECTOR vAngMid( vAxRot.size()) ;
-         for ( size_t i = 0 ; i < vAxRot.size() ; ++ i)
-            vAngMid[i] = ( vAxRotPrec[i] + vAxRot[i]) / 2 ;
+         for ( int j = 0 ; j < ssize( vAxRot) ; ++ j)
+            vAngMid[j] = ( vAxRotPrec[j] + vAxRot[j]) / 2 ;
          double dXmid, dYmid, dZmid ;
          bool bLmidOk = m_pMchMgr->GetCalcPositions( ptMid, vAngMid, dXmid, dYmid, dZmid) ;
          if ( ! bLmidOk) {
@@ -2253,8 +2253,8 @@ Operation::MyCalculateClPathMcentAxesValues( int nClPathId, double dAngDeltaMinF
          Point3d ptEnd = ptP - dDeltaN * vtN ;
         // determino i valori degli assi al punto finale
          DBLVECTOR vAngEnd( vAxRot.size()) ;
-         for ( size_t i = 0 ; i < vAxRot.size() ; ++ i)
-            vAngEnd[i] = vAxRot[i] ;
+         for ( int j = 0 ; j < ssize( vAxRot) ; ++ j)
+            vAngEnd[j] = vAxRot[j] ;
          double dXend, dYend, dZend ;
          bool bLendOk = m_pMchMgr->GetCalcPositions( ptEnd, vAngEnd, dXend, dYend, dZend) ;
          if ( ! bLendOk) {
@@ -2312,8 +2312,8 @@ Operation::MyCalculateClPathMcentAxesValues( int nClPathId, double dAngDeltaMinF
                   double dCoeff = double( i) / NUM_VERIF_STEP ;
                   Point3d ptCurr = ptCen + vtCurr + vtN * dDeltaN * dCoeff ;
                   DBLVECTOR vAng( vAxRot.size()) ;
-                  for ( size_t i = 0 ; i < vAxRot.size() ; ++ i)
-                     vAng[i] = vAxRotPrec[i] * ( 1 - dCoeff) + vAxRot[i] * dCoeff ;
+                  for ( int j = 0 ; j < ssize( vAxRot) ; ++ j)
+                     vAng[j] = vAxRotPrec[j] * ( 1 - dCoeff) + vAxRot[j] * dCoeff ;
                   int nStat ;
                   bool bOsOk = m_pMchMgr->VerifyOutstroke( ptCurr.x, ptCurr.y, ptCurr.z, vAng, false, nStat) ;
                   if ( ! bOsOk  ||  nStat != 0) {