diff --git a/EgtMachKernel.rc b/EgtMachKernel.rc
index 2892464..d266acd 100644
Binary files a/EgtMachKernel.rc and b/EgtMachKernel.rc differ
diff --git a/Machine.cpp b/Machine.cpp
index 061e13a..da2d70a 100644
--- a/Machine.cpp
+++ b/Machine.cpp
@@ -1097,6 +1097,13 @@ Machine::IsLinkedRawPart( int nRawId) const
    return ( find( m_vLinkedRawParts.begin(), m_vLinkedRawParts.end(), nRawId) != m_vLinkedRawParts.end()) ;
 }
 
+//----------------------------------------------------------------------------
+const INTVECTOR&
+Machine:: GetAllLinkedRawParts( void) const
+{
+   return m_vLinkedRawParts ;
+}
+
 //----------------------------------------------------------------------------
 bool
 Machine::UnlinkRawPartFromGroup( int nRawPartId)
diff --git a/Machine.h b/Machine.h
index bde783f..ececbb0 100644
--- a/Machine.h
+++ b/Machine.h
@@ -151,6 +151,7 @@ class Machine
                { return m_nMachineLook ; }
       bool LinkRawPartToGroup( int nRawPartId, const std::string& sGroupName) ;
       bool IsLinkedRawPart( int nRawId) const ;
+      const INTVECTOR& GetAllLinkedRawParts( void) const ;
       bool UnlinkRawPartFromGroup( int nRawPartId) ;
       bool UnlinkAllRawPartsFromGroups( void) ;
       bool LinkFixtureToGroup( int nFxtId, const std::string& sGroupName) ;
@@ -321,6 +322,7 @@ class Machine
       static int LuaEmtGetAxesPos( lua_State* L) ;
       static int LuaEmtGetBackAuxDir( lua_State* L) ;
       static int LuaEmtLinkRawPartToGroup( lua_State* L) ;
+      static int LuaEmtGetAllLinkedRawParts( lua_State* L) ;
       static int LuaEmtUnlinkRawPartFromGroup( lua_State* L) ;
       static int LuaEmtUnlinkAllRawPartsFromGroups( lua_State* L) ;
       static int LuaEmtLinkFixtureToGroup( lua_State* L) ;
diff --git a/MachineLua.cpp b/MachineLua.cpp
index 4e930d5..b63d858 100644
--- a/MachineLua.cpp
+++ b/MachineLua.cpp
@@ -96,6 +96,7 @@ Machine::LuaInit( const string& sMachineName)
    m_LuaMgr.RegisterFunction( "EmtModifyHeadAuxDirection", Machine::LuaEmtModifyHeadAuxDirection) ;
    m_LuaMgr.RegisterFunction( "EmtModifyExitPosition", Machine::LuaEmtModifyExitPosition) ;
    m_LuaMgr.RegisterFunction( "EmtLinkRawPartToGroup", Machine::LuaEmtLinkRawPartToGroup) ;
+   m_LuaMgr.RegisterFunction( "EmtGetAllLinkedRawParts", Machine::LuaEmtGetAllLinkedRawParts) ;
    m_LuaMgr.RegisterFunction( "EmtUnlinkRawPartFromGroup", Machine::LuaEmtUnlinkRawPartFromGroup) ;
    m_LuaMgr.RegisterFunction( "EmtUnlinkAllRawPartsFromGroups", Machine::LuaEmtUnlinkAllRawPartsFromGroups) ;
    m_LuaMgr.RegisterFunction( "EmtLinkFixtureToGroup", Machine::LuaEmtLinkFixtureToGroup) ;
@@ -984,6 +985,22 @@ Machine::LuaEmtUnlinkRawPartFromGroup( lua_State* L)
    return 1 ;
 }
 
+//----------------------------------------------------------------------------
+int
+Machine::LuaEmtGetAllLinkedRawParts( lua_State* L)
+{
+  // nessun parametro
+   LuaClearStack( L) ;
+  // verifico ci sia una macchina attiva
+   if ( m_pMchLua == nullptr)
+      return luaL_error( L, " Unknown Machine") ;
+  // recupero l'elenco dei grezzi agganciati ad un gruppo macchina
+   const INTVECTOR& vLinkedRawParts = m_pMchLua->GetAllLinkedRawParts() ;
+  // assegno risultato
+   LuaSetParam( L, vLinkedRawParts) ;
+   return 1 ;
+}
+
 //----------------------------------------------------------------------------
 int
 Machine::LuaEmtUnlinkAllRawPartsFromGroups( lua_State* L)
diff --git a/Operation.cpp b/Operation.cpp
index d99ea44..646112f 100644
--- a/Operation.cpp
+++ b/Operation.cpp
@@ -372,7 +372,7 @@ Operation::GetPointUnderRaw( const Point3d& ptP, const Vector3d& vtTool, double
          int nStmId = m_pGeomDB->GetFirstNameInGroup( nRawId, MACH_RAW_SOLID) ;
          BBox3d b3Raw ;
          m_pGeomDB->GetGlobalBBox( nStmId, b3Raw) ;
-         b3Raw.Expand( 0.5 * dSafeZ) ;
+         b3Raw.Expand( 0.5 * dSafeZ, 0.5 * dSafeZ, 0) ;
          if ( ! b3Raw.IsEmpty()  &&  b3Raw.OverlapsXY( b3Tool)  &&  ptP.z + dExtraZ < b3Raw.GetMin().z - 10 * EPS_SMALL) {
             double dRawCentZ = ( b3Raw.GetMin().z + b3Raw.GetMax().z) / 2 ;
             double dRawDimZ = b3Raw.GetMax().z - b3Raw.GetMin().z ;