diff --git a/EGkGdbConst.h b/EGkGdbConst.h
index f94f82b..dba803c 100644
--- a/EGkGdbConst.h
+++ b/EGkGdbConst.h
@@ -21,9 +21,11 @@ const int GDB_ID_SEL = -2 ;
 const int GDB_ID_GRID = -3 ;
 
 //----------------- Costanti posizione di inserimento nel DB geometrico --------
-enum GdbInsPos { GDB_BEFORE = -1,
-                 GDB_SON = 0,
-                 GDB_AFTER = +1} ;
+enum GdbInsPos { GDB_FIRST_SON = 0,
+                 GDB_LAST_SON = 1,
+                 GDB_BEFORE = 2,
+                 GDB_AFTER = 3} ;
+#define IS_GDB_SON(Ins)   ( Ins == GDB_FIRST_SON  ||  Ins == GDB_LAST_SON)
 
 //----------------- Costanti tipo salvataggio del DB geometrico ----------------
 enum GdbSave { GDB_SV_TXT =  0,
diff --git a/EGkGeomDB.h b/EGkGeomDB.h
index c5014f8..6f40bdb 100644
--- a/EGkGeomDB.h
+++ b/EGkGeomDB.h
@@ -67,10 +67,10 @@ class __declspec( novtable) IGeomDB
       virtual bool GetLocalBBox( int nId, BBox3d& b3Loc, int nFlag = BBF_STANDARD) const = 0 ;
       virtual bool GetGlobalBBox( int nId, BBox3d& b3Glob, int nFlag = BBF_STANDARD) const = 0 ;
       virtual bool GetRefBBox( int nId, const Frame3d& frRef, BBox3d& b3Ref, int nFlag = BBF_STANDARD) const = 0 ;
-      virtual int  Copy( int nIdSou, int nIdDest, int nRefId, int nSonBeforeAfter = GDB_SON) = 0 ;
-      virtual int  CopyGlob( int nIdSou, int nIdDest, int nRefId, int nSonBeforeAfter = GDB_SON) = 0 ;
-      virtual bool Relocate( int nId, int nRefId, int nSonBeforeAfter = GDB_SON) = 0  ;
-      virtual bool RelocateGlob( int nId, int nRefId, int nSonBeforeAfter = GDB_SON) = 0 ;
+      virtual int  Copy( int nIdSou, int nIdDest, int nRefId, int nSonBeforeAfter = GDB_LAST_SON) = 0 ;
+      virtual int  CopyGlob( int nIdSou, int nIdDest, int nRefId, int nSonBeforeAfter = GDB_LAST_SON) = 0 ;
+      virtual bool Relocate( int nId, int nRefId, int nSonBeforeAfter = GDB_LAST_SON) = 0  ;
+      virtual bool RelocateGlob( int nId, int nRefId, int nSonBeforeAfter = GDB_LAST_SON) = 0 ;
       virtual bool ChangeId( int nId, int nNewId) = 0 ;
       virtual bool Erase( int nId) = 0 ;
       virtual bool EmptyGroup( int nId) = 0 ;
diff --git a/EInAPI.h b/EInAPI.h
index 48e0477..4386136 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -368,6 +368,10 @@ EIN_EXPORT BOOL __stdcall EgtMirrorGroup( int nId, const double vPnt[3], const d
 EIN_EXPORT BOOL __stdcall EgtShearGroup( int nId, const double vPnt[3], const double vN[3],
                                          const double vDir[3], double dCoeff) ;
 
+// Machining
+EIN_EXPORT BOOL __stdcall EgtInitMachMgr( void) ;
+EIN_EXPORT int  __stdcall EgtAddMachGroup( const wchar_t* wsName, const wchar_t* wsMachineName) ;
+
 // Scene
 EIN_EXPORT BOOL __stdcall EgtInitScene( HWND hWnd, int nDriver, int b2Buff, int nColorBits, int nDepthBits) ;
 EIN_EXPORT BOOL __stdcall EgtGetSceneInfo( wchar_t*& wsInfo) ;
diff --git a/EMkMachMgr.h b/EMkMachMgr.h
new file mode 100644
index 0000000..0093359
--- /dev/null
+++ b/EMkMachMgr.h
@@ -0,0 +1,36 @@
+//----------------------------------------------------------------------------
+//  EgalTech 2015-2015
+//----------------------------------------------------------------------------
+// File : EMkMachMgr.h           Data : 23.03.15          Versione : 1.6c6
+// Contenuto : Dichiarazione della interfaccia IMachMgr.
+//
+//
+//
+// Modifiche : 23.03.15 DS Creazione modulo.
+//
+//
+//----------------------------------------------------------------------------
+
+#pragma once
+
+#include "/EgtDev/Include/EGkGeomDB.h"
+
+//----------------------- Macro per import/export ----------------------------
+#undef EMK_EXPORT
+#if defined( I_AM_EMK)            // da definirsi solo nella DLL
+   #define EMK_EXPORT __declspec( dllexport)
+#else
+   #define EMK_EXPORT __declspec( dllimport)
+#endif
+
+//-----------------------------------------------------------------------------
+class __declspec( novtable) IMachMgr
+{
+   public :
+      virtual ~IMachMgr( void) {} 
+      virtual bool Init( IGeomDB* pGeomDB) = 0 ;
+      virtual int AddMachGroup( const std::string& sName, const std::string& sMachineName) = 0 ;
+} ;
+
+//-----------------------------------------------------------------------------
+EMK_EXPORT IMachMgr* CreateMachMgr( void) ;
\ No newline at end of file