diff --git a/EXE_GdbModifyVol.cpp b/EXE_GdbModifyVol.cpp
index d29a16e..f80c209 100644
--- a/EXE_GdbModifyVol.cpp
+++ b/EXE_GdbModifyVol.cpp
@@ -330,6 +330,28 @@ ExeVolZmapSetChiselTool( const INTVECTOR& vIds, const string& sToolName,
    return bOk ;
 }
 
+//----------------------------------------------------------------------------
+bool
+ExeVolZmapResetTool( const INTVECTOR& vIds)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // recupero gli Zmap e assegno i dati dell'utensile
+   bool bOk = true ;
+   for ( int i = 0 ; i < int( vIds.size()) ; ++ i) {
+      IVolZmap* pVZM = GetVolZmap( pGeomDB->GetGeoObj( vIds[i])) ;
+      bOk = ( pVZM != nullptr && pVZM->ResetTool() && bOk) ;
+   }
+  // se richiesto, salvo il comando Lua equivalente
+   if ( IsCmdLog()) {
+      string sLua = "EgtVolZmapResetTool({" + IdListToString( vIds) + "})" +
+                    " -- Ok=" + ToString( bOk) ;
+      LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
+   }
+  // restituisco risultato
+   return bOk ;
+}
+
 //----------------------------------------------------------------------------
 int
 MyVolZmapGetToolOutline( int nId, int nDestGrpId, bool bApprox)
diff --git a/LUA_GdbModifyVol.cpp b/LUA_GdbModifyVol.cpp
index d1a1472..69315f7 100644
--- a/LUA_GdbModifyVol.cpp
+++ b/LUA_GdbModifyVol.cpp
@@ -234,6 +234,21 @@ LuaVolZmapSetChiselTool( lua_State* L)
    return 1 ;
 }
 
+//----------------------------------------------------------------------------
+static int
+LuaVolZmapResetTool( lua_State* L)
+{
+  // 1 parametro : vIds
+   INTVECTOR vIds ;
+   LuaCheckParam( L, 1, vIds)
+   LuaClearStack( L) ;
+  // reset utensile a Zmap indicati
+   bool bOk = ExeVolZmapResetTool( vIds) ;
+  // restituisco il risultato
+   LuaSetParam( L, bOk) ;
+   return 1 ;
+}
+
 //----------------------------------------------------------------------------
 static int
 LuaVolZmapGetToolOutline( lua_State* L)
@@ -447,6 +462,7 @@ LuaInstallGdbModifyVol( LuaMgr& luaMgr)
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapSetGenTool", LuaVolZmapSetGenTool) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapSetMortiserTool", LuaVolZmapSetMortiserTool) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapSetChiselTool", LuaVolZmapSetChiselTool) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapResetTool", LuaVolZmapResetTool) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapGetToolOutline", LuaVolZmapGetToolOutline) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapMillingStep", LuaVolZmapMillingStep) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapGetDepth", LuaVolZmapGetDepth) ;