diff --git a/Machining.cpp b/Machining.cpp
index 1b55645..7436a6f 100644
--- a/Machining.cpp
+++ b/Machining.cpp
@@ -287,12 +287,12 @@ Machining::ToolPreview( int nEntId, int nFlag) const
    Frame3d frHead ;
    m_pGeomDB->GetGroupGlobFrame( nId, frHead) ;
    Frame3d frRef ;
-   if ( vtAux.IsSmall())
+   if ( vtAux.IsSmall()  ||  AreSameOrOppositeVectorApprox( vtAux, vtDir))
       frRef.Set( ptOrig, vtDir) ;
    else
       frRef.Set( ptOrig, vtDir, vtAux) ;
    Frame3d frShow ;
-   if ( vtBAux.IsSmall())
+   if ( vtBAux.IsSmall()  ||  AreSameOrOppositeVectorApprox( vtBAux, vtTool))
       frShow.Set( ptEnd + vtTool * GetToolData().m_dLen, vtTool) ;
    else
       frShow.Set( ptEnd + vtTool * GetToolData().m_dLen, vtTool, vtBAux) ;
diff --git a/Pocketing.cpp b/Pocketing.cpp
index 8b820e9..fc31696 100644
--- a/Pocketing.cpp
+++ b/Pocketing.cpp
@@ -5269,8 +5269,11 @@ Pocketing::AddLeadIn( const Point3d& ptP1, const Point3d& ptStart, const Vector3
          return ( AddLinearMove( ptStart, MCH_CL_LEADIN) != GDB_ID_NULL) ;
       }
      // altrimenti diretto
-      else
+      else {
          nType = POCKET_LI_NONE ;
+         if ( m_TParams.m_nType == TT_MILL_NOTIP)
+            return false ;
+      }
    }
   // Se a scivolo e fattibile
    if ( nType == POCKET_LI_GLIDE) {