diff --git a/SurfFinishing.cpp b/SurfFinishing.cpp
index 1be3c5d..2c69d9c 100644
--- a/SurfFinishing.cpp
+++ b/SurfFinishing.cpp
@@ -4111,7 +4111,7 @@ SurfFinishing::AddProjection( ICAvToolSurfTm* pCAvTlStm, const SURFLOCALVECTOR&
       if ( ! vCrvToProj[i]->ApproxWithLines( EPS_SMALL, ANG_TOL_STD_DEG, ICurve::APL_STD, PL))
          return false ;
      // recupero la distanza di traslazione della Polyline e la traslo
-      PL.Translate( BBox3Loc.GetMin().z * vtTool) ;
+      PL.Translate( -dDepth * vtTool) ;
      // calcolo direzione di allontanamento dalle superfici
       const double MIN_DIST = 1. ;
       const double MAX_DIST = 50. ;