diff --git a/Sawing.cpp b/Sawing.cpp
index 42c4663..568ca54 100644
--- a/Sawing.cpp
+++ b/Sawing.cpp
@@ -1760,10 +1760,11 @@ Sawing::ProcessLine( const ICurve* pCrvP, const ICurveLine* pLineC, const ICurve
   // aggiungo affondamento
    pLine->Translate( - vtCorr * dDepth) ;
   // calcolo elevazione (sui due bordi della striscia, leggermente allargata)
+   const double DELTA_ELEV_THICK = 2.0 ; 
    double dElev, dElev2 ;
    Vector3d vtToolH( vtTool.x, vtTool.y, 0) ;
-   Vector3d vtSafe = vtToolH * ( 10 * EPS_SMALL) ;
-   Vector3d vtThick = vtToolH * ( m_TParams.m_dThick / vtToolH.SqLen() + 10 * EPS_SMALL) ;
+   Vector3d vtSafe = vtToolH * DELTA_ELEV_THICK ;
+   Vector3d vtThick = vtToolH * ( m_TParams.m_dThick / vtToolH.SqLen() + DELTA_ELEV_THICK) ;
    if ( ! GetElevation( m_nPhase, pLine->GetStart() - vtSafe, pLine->GetEnd() - vtSafe, vtCorr, dElev)  ||
         ! GetElevation( m_nPhase, pLine->GetStart() + vtThick, pLine->GetEnd() + vtThick, vtCorr, dElev2) ) {
       m_pMchMgr->SetLastError( 2210, "Error in Sawing : Entity GetElevation") ;