diff --git a/Operation.cpp b/Operation.cpp
index d5e2437..8a3e2e5 100644
--- a/Operation.cpp
+++ b/Operation.cpp
@@ -2138,9 +2138,6 @@ Operation::AddRise( DBLVECTOR& vAxVal, double dDelta, int nClPathId, bool bZHome
 {
    if ( m_pMchMgr == nullptr  ||  m_pGeomDB == nullptr)
       return false ;
-  // se risalita praticamente nulla, esco con successo
-   if ( abs( dDelta) < 10 * EPS_SMALL)
-      return true ;
   // recupero gruppo per geometria di lavorazione (Cutter Location)
    int nClId = m_pGeomDB->GetFirstNameInGroup( GetOwner(), MCH_CL) ;
    if ( nClId == GDB_ID_NULL)
@@ -2161,9 +2158,15 @@ Operation::AddRise( DBLVECTOR& vAxVal, double dDelta, int nClPathId, bool bZHome
    if ( nEntId == GDB_ID_NULL)
       return false ;
   // ne recupero i dati Cam
-   CamData* pCamData = GetCamData( m_pGeomDB->GetUserObj( nEntId)) ;
+   const CamData* pCamData = GetCamData( m_pGeomDB->GetUserObj( nEntId)) ;
    if ( pCamData == nullptr)
       return false ;
+  // se risalita praticamente nulla, esco con successo
+   if ( abs( dDelta) < 10 * EPS_SMALL) {
+     // recupero i valori degli assi
+      vAxVal = pCamData->GetAxesVal() ;
+      return ( vAxVal.size() >= 3) ;
+   }
   // creo oggetto punto per DB geometrico
    PtrOwner<IGeoPoint3d> pGP( CreateGeoPoint3d()) ;
    if ( IsNull( pGP))