diff --git a/EXE_GdbModifyCurve.cpp b/EXE_GdbModifyCurve.cpp
index f483892..c55b35b 100644
--- a/EXE_GdbModifyCurve.cpp
+++ b/EXE_GdbModifyCurve.cpp
@@ -1413,7 +1413,7 @@ ExeExplodeCurveCompo( int nId, int* pnCount)
 
 //-------------------------------------------------------------------------------
 bool
-ExeMergeCurvesInCurveCompo( int nId, double dLinTol)
+ExeMergeCurvesInCurveCompo( int nId, double dLinTol, bool bStartEnd)
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
@@ -1422,12 +1422,13 @@ ExeMergeCurvesInCurveCompo( int nId, double dLinTol)
    bool bOk = ( pCompo != nullptr) ;
   // lancio il merge delle curve componenti
    const double ANG_TOL_STD_DEG = 15 ;
-   bOk = bOk && pCompo->MergeCurves( dLinTol, ANG_TOL_STD_DEG) ;
+   bOk = bOk && pCompo->MergeCurves( dLinTol, ANG_TOL_STD_DEG, bStartEnd) ;
    ExeSetModified() ;
   // se richiesto, salvo il comando Lua equivalente
    if ( IsCmdLog()) {
       string sLua = "EgtMergeCurvesInCurveCompo(" + ToString( nId) + "," +
-                                                    ToString( dLinTol) + ")" +
+                                                    ToString( dLinTol) + "," +
+                                                    ( bStartEnd ? "true" : "false") + ")" +
                     " -- Ok=" + ToString( bOk) ;
       LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
    }
diff --git a/EXE_MachMgr.cpp b/EXE_MachMgr.cpp
index 17dbfd3..57358be 100644
--- a/EXE_MachMgr.cpp
+++ b/EXE_MachMgr.cpp
@@ -1898,7 +1898,7 @@ ExeGetCalcTipFromPositions( double dX, double dY, double dZ, double dAngA, doubl
    GseContext* pGseCtx = GetCurrGseContext() ;
    VERIFY_CTX_MACHMGR( pGseCtx, false)
   // calcolo il tip utensile dagli assi macchina
-   return pGseCtx->m_pMachMgr->GetCalcTipFromPositions( dX, dY, dZ, dAngA, dAngB, bBottom, ptTip) ;
+   return pGseCtx->m_pMachMgr->GetCalcTipFromPositions( dX, dY, dZ, dAngA, dAngB, false, bBottom, ptTip) ;
 }
 
 //-----------------------------------------------------------------------------
diff --git a/EXE_NstCreateFlatParts.cpp b/EXE_NstCreateFlatParts.cpp
index 49111f1..a903f6c 100644
--- a/EXE_NstCreateFlatParts.cpp
+++ b/EXE_NstCreateFlatParts.cpp
@@ -626,7 +626,7 @@ ExeAdjustFlatPartLayer( int nLayerId)
      // Se curva composita
       if ( pGeomDB->GetGeoType( nId) == CRV_COMPO) {
         // Compatto
-         bOk = ExeMergeCurvesInCurveCompo( nId, 10 * EPS_SMALL) ;
+         bOk = ExeMergeCurvesInCurveCompo( nId, 10 * EPS_SMALL, true) ;
         // Esplodo in curve semplici
          bOk = bOk && ExeExplodeCurveCompo( nId, nullptr) ;
       }
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index c1544b7..c64b90e 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_GdbModifyCurve.cpp b/LUA_GdbModifyCurve.cpp
index f0d2b3d..de5bc87 100644
--- a/LUA_GdbModifyCurve.cpp
+++ b/LUA_GdbModifyCurve.cpp
@@ -623,14 +623,18 @@ LuaExplodeCurveCompo( lua_State* L)
 static int
 LuaMergeCurvesInCurveCompo( lua_State* L)
 {
-  // 1 o 2 parametri : Id [, dLinTol]
+  // 1 o 2 o 3 parametri : Id [, dLinTol] [, bStartEnd]
    int nId ;
    LuaCheckParam( L, 1, nId)
    double dLinTol = 0.01 ;
-   LuaGetParam( L, 2, dLinTol) ;
+   bool bStartEnd = true ;
+   if ( LuaGetParam( L, 2, dLinTol))
+      LuaGetParam( L, 3, bStartEnd) ;
+   else
+      LuaGetParam( L, 2, bStartEnd) ;
    LuaClearStack( L) ;
   // esplosione della curva composita
-   bool bOk = ExeMergeCurvesInCurveCompo( nId, dLinTol) ;
+   bool bOk = ExeMergeCurvesInCurveCompo( nId, dLinTol, bStartEnd) ;
    LuaSetParam( L, bOk) ;
    return 1 ;
 }