diff --git a/EGkCurvePointDiffGeom.h b/EGkCurvePointDiffGeom.h
index d1e7afd..6255582 100644
--- a/EGkCurvePointDiffGeom.h
+++ b/EGkCurvePointDiffGeom.h
@@ -55,7 +55,7 @@ ThereIsDiscontinuity( CrvPointDiffGeom& oDiffGp, CrvPointDiffGeom& oDiffGs)
         ( oDiffGs.nStatus & CrvPointDiffGeom::POS) == 0)
       return false ;
   // verifico che il parametro e i punti coincidano
-   if ( fabs ( oDiffGp.dU - oDiffGs.dU) > EPS_ZERO  ||
+   if ( fabs ( oDiffGp.dU - oDiffGs.dU) > EPS_PARAM  ||
         ! AreSamePointApprox( oDiffGp.ptP, oDiffGs.ptP))
       return false ;
   // verifico che siano definite le tangenti
diff --git a/EGkGeoConst.h b/EGkGeoConst.h
index 849d499..b0d4c90 100644
--- a/EGkGeoConst.h
+++ b/EGkGeoConst.h
@@ -21,8 +21,8 @@ const double ONEINCH = 25.4 ;
 
 // epsilon per lunghezze, versori e parametri
 const double EPS_SMALL = 1e-3 ;
-const double EPS_ZERO  = 1e-7 ;
-const double EPS_PARAM = 1e-7 ;
+const double EPS_ZERO  = 1e-8 ;
+const double EPS_PARAM = 1e-8 ;
 const double SPAN_PARAM = 1.0 ;    // intervallo di curva o superficie semplici
 
 // infinito per lunghezze
diff --git a/EGkIntervals.h b/EGkIntervals.h
index 96c9f5c..b7baa85 100644
--- a/EGkIntervals.h
+++ b/EGkIntervals.h
@@ -13,6 +13,7 @@
 
 #pragma once
 
+#include <algorithm>
 #include <list>
 
 //----------------------- Macro per import/export ----------------------------
@@ -28,7 +29,9 @@ class Intervals
 {
    public :
       EGK_EXPORT Intervals( void)
-                    : m_Iter( m_lInts.end()) {}
+                    : m_dToler( EPS_SMALL), m_Iter( m_lInts.end()) {}
+      EGK_EXPORT Intervals( double dToler)
+                    : m_dToler( std::max( dToler, EPS_ZERO)), m_Iter( m_lInts.end()) {}
 
    public :
       EGK_EXPORT void Reset( void) ;
@@ -52,6 +55,7 @@ class Intervals
       typedef INTERVLIST::const_iterator  INTL_CINT ; // iteratore costante a lista di intervalli
 
    private :
+      double     m_dToler ;
       INTERVLIST m_lInts ;
       INTL_CINT  m_Iter ;
 } ;
diff --git a/EInAPI.h b/EInAPI.h
index 97e441e..ac29032 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -437,7 +437,7 @@ EIN_EXPORT BOOL __stdcall EgtPackPart( int nId, double dXmin, double dYmin,
 EIN_EXPORT BOOL __stdcall EgtPackCluster( int nId[], int nCount, double dXmin, double dYmin,
                                           double dXmax, double dYmax, double dOffs, BOOL bBottomUp) ;
 EIN_EXPORT BOOL __stdcall EgtGetClusterBBoxGlob( int nId[], int nCount, double ptMin[3], double ptMax[3]) ;
-EIN_EXPORT BOOL __stdcall EgtMoveCluster( int nId[], int nCount, const double vtMove[3],
+EIN_EXPORT BOOL __stdcall EgtMoveCluster( int nId[], int nCount, double vtMove[3],
                                           double dXmin, double dYmin, double dXmax, double dYmax, double dOffs) ;
 
 // Machining
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 8622e0e..c2846e0 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -446,7 +446,7 @@ EXE_EXPORT bool ExePackPart( int nId, double dXmin, double dYmin,
 EXE_EXPORT bool ExePackCluster( const INTVECTOR& vIds, double dXmin, double dYmin,
                                 double dXmax, double dYmax, double dOffs, bool bBottomUp) ;
 EXE_EXPORT bool ExeGetClusterBBoxGlob( const INTVECTOR& vIds, BBox3d& b3Box) ;
-EXE_EXPORT bool ExeMoveCluster( const INTVECTOR& vIds, const Vector3d& vtMove,
+EXE_EXPORT bool ExeMoveCluster( const INTVECTOR& vIds, Vector3d& vtMove,
                                 double dXmin, double dYmin, double dXmax, double dYmax, double dOffs) ;
 
 // Machining