diff --git a/EgtMachKernel.rc b/EgtMachKernel.rc
index 2a92867..7e996f8 100644
Binary files a/EgtMachKernel.rc and b/EgtMachKernel.rc differ
diff --git a/Milling.cpp b/Milling.cpp
index 993fc0c..6574bda 100644
--- a/Milling.cpp
+++ b/Milling.cpp
@@ -107,7 +107,7 @@ Milling*
 Milling::Clone( void) const
 {
   // alloco oggetto
-   Milling* pMill = new(nothrow) Milling ;
+   Milling* pMill = new( nothrow) Milling ;
   // eseguo copia dei dati
    if ( pMill != nullptr) {
       try {
@@ -4414,7 +4414,8 @@ Milling::AddSawBladeSideApproach( const Point3d& ptP, const Vector3d& vtAppr, co
       Vector3d vtMove = Vector3d( vtTool.x, vtTool.y, 0) ;
       if ( vtMove.Normalize()) {
          if ( m_bAboveHead  &&  vtAppr.z < LIM_DOWN_APPRZ) {
-            double dExtraElev ;
+           // deve essere inizializzata a zero
+            double dExtraElev = 0 ;
             if ( GetAhPointUnderRaw( ptP1a, vtTool, m_TParams.m_dTDiam / 2,
                                      GetRadiusForStartEndElevation( false),
                                      m_TParams.m_dLen, true, dSafeZ, vtMove, dExtraElev)) {
@@ -4436,7 +4437,8 @@ Milling::AddSawBladeSideApproach( const Point3d& ptP, const Vector3d& vtAppr, co
             }
          }
          else if ( ! m_bAboveHead  &&  vtAppr.z > -LIM_DOWN_APPRZ) {
-            double dExtraElev ;
+           // deve essere inizializzata a zero
+            double dExtraElev = 0 ;
             if ( GetUhPointAboveRaw( ptP1a, vtTool, m_TParams.m_dTDiam / 2,
                                      GetRadiusForStartEndElevation( false),
                                      m_TParams.m_dLen, true, dSafeZ, vtMove, dExtraElev)) {
@@ -4630,7 +4632,8 @@ Milling::AddSawBladeSideRetract( const Point3d& ptP, const Vector3d& vtRetr, con
       vtMove = Vector3d( vtTool.x, vtTool.y, 0) ;
       if ( vtMove.Normalize()) {
          if ( m_bAboveHead  &&  vtRetr.z < LIM_DOWN_APPRZ) {
-            double dExtraElev ;
+           // deve essere inizializzata a zero
+            double dExtraElev = 0 ;
             if ( GetAhPointUnderRaw( ptP4, vtTool, m_TParams.m_dTDiam / 2,
                                      GetRadiusForStartEndElevation( false),
                                      m_TParams.m_dLen, true, dSafeZ, vtMove, dExtraElev)) {
@@ -4641,7 +4644,8 @@ Milling::AddSawBladeSideRetract( const Point3d& ptP, const Vector3d& vtRetr, con
             }
          }
          else if ( ! m_bAboveHead  &&  vtRetr.z > -LIM_DOWN_APPRZ) {
-            double dExtraElev ;
+           // deve essere inizializzata a zero
+            double dExtraElev = 0 ;
             if ( GetUhPointAboveRaw( ptP4, vtTool, m_TParams.m_dTDiam / 2,
                                      GetRadiusForStartEndElevation( false),
                                      m_TParams.m_dLen, true, dSafeZ, vtMove, dExtraElev)) {
@@ -6394,7 +6398,7 @@ Milling::CalcAndSetCorrAuxDir( const ICurveComposite* pCompo, double dU, bool bI
 
 //----------------------------------------------------------------------------
 Vector3d
-Milling::CalcCorrDir( const ICurveComposite* pCompo, double dU, bool bInvertSide, bool bSawSpecial)
+Milling::CalcCorrDir( const ICurveComposite* pCompo, double dU, bool bInvertSide, bool bSawSpecial) const
 {
   // verifico curva
    if ( pCompo == nullptr)
@@ -6465,7 +6469,7 @@ Milling::CalcCorrDir( const ICurveComposite* pCompo, double dU, bool bInvertSide
 
 //----------------------------------------------------------------------------
 bool
-Milling::CalcOffset( ICurveComposite* pCompo, double dSignOffs)
+Milling::CalcOffset( ICurveComposite* pCompo, double dSignOffs) const
 {
   // determino opzioni di offset
    int nFlag = ICurve::OFF_FILLET ;
diff --git a/Milling.h b/Milling.h
index 71d7955..ca5080f 100644
--- a/Milling.h
+++ b/Milling.h
@@ -129,8 +129,8 @@ class Milling : public Machining
       bool GetPointAboveRaw( const Point3d& ptP, const Vector3d& vtTool) const ;
       bool GetPointBelowRaw( const Point3d& ptP, const Vector3d& vtTool) const ;
       bool CalcAndSetCorrAuxDir( const ICurveComposite* pCompo, double dU, bool bInvertSide = false, bool bSawSpecial = false) ;
-      Vector3d CalcCorrDir( const ICurveComposite* pCompo, double dU, bool bInvertSide = false, bool bSawSpecial = false) ;
-      bool CalcOffset( ICurveComposite* pCompo, double dSignOffs) ;
+      Vector3d CalcCorrDir( const ICurveComposite* pCompo, double dU, bool bInvertSide = false, bool bSawSpecial = false) const ;
+      bool CalcOffset( ICurveComposite* pCompo, double dSignOffs) const ;
       bool TrimExtendCurveToClosedStm( ICurveComposite* pCompo, int nCstmId, bool bInvert) ;
 
    private :