diff --git a/Pocketing.cpp b/Pocketing.cpp
index 15fa5f8..599e47b 100644
--- a/Pocketing.cpp
+++ b/Pocketing.cpp
@@ -1558,7 +1558,7 @@ Pocketing::ProcessPath( int nPathId, int nPvId, int nClId)
 
   // sposto l'inizio a metà del tratto più lungo ( o aperto più lungo)
    if ( bMidOpen) {
-      const double LEN_OUT = 5 ;
+      const double LEN_OUT = 5. + ( m_TParams.m_dDiam / 2.) ;
       double dPar ; int nFlag ;
       bMidOpen = ( DistPointCurve( ptMidOpen + LEN_OUT * vtMidOut, *pCompo).GetParamAtMinDistPoint( 0, dPar, nFlag) && pCompo->ChangeStartPoint( dPar)) ;
    }