diff --git a/SurfRoughing.cpp b/SurfRoughing.cpp
index d7af495..28f02d5 100644
--- a/SurfRoughing.cpp
+++ b/SurfRoughing.cpp
@@ -250,7 +250,7 @@ SurfRoughing::SurfRoughing( void)
    m_nPaths = 0 ;
    m_dMaxHelixRad = INFINITO ;
    m_dSubStepToler = 2.0 / 2 ;
-   m_bDetectPlaneZ = true ;
+   m_bDetectPlaneZ = false ;
 }
 
 //----------------------------------------------------------------------------
@@ -1220,6 +1220,10 @@ SurfRoughing::ProcessPath( int nPathId, int nTempId, int nPvId, int nClId)
   // assegno il versore fresa
    Vector3d vtTool = vtExtr ;
 
+  // controllo se richiesto PlaneZDetection
+   bool bPlaneZDetection = false ;
+   m_bDetectPlaneZ = ( FromString( ExtractInfo( m_Params.m_sUserNotes, "PlaneZ="), bPlaneZDetection)  &&  bPlaneZDetection) ;
+
   // non prevista gestione anteprima di lavorazione
 
   // se richiesta lavorazione