diff --git a/MachMgrParts.cpp b/MachMgrParts.cpp
index 7f51a32..cde147c 100644
--- a/MachMgrParts.cpp
+++ b/MachMgrParts.cpp
@@ -88,7 +88,7 @@ MachMgr::AddPartToRawPart( int nPartId, const Point3d& ptPos, int nRawId)
       return false ;
   // recupero box del pezzo
    BBox3d b3Part ;
-   if ( ! m_pGeomDB->GetGlobalBBox( nPartId, b3Part))
+   if ( ! m_pGeomDB->GetGlobalBBox( nPartId, b3Part, BBF_EXACT))
       return false ;
   // recupero il riferimento del pezzo
    Frame3d frPart ;
@@ -184,7 +184,7 @@ MachMgr::RotatePartInRawPart( int nPartId, const Vector3d& vtAx, double dAngRotD
       return false ;
   // recupero box del pezzo in locale (non cambia con la giacitura globale)
    BBox3d b3Box ;
-   if ( ! m_pGeomDB->GetLocalBBox( nPartId, b3Box))
+   if ( ! m_pGeomDB->GetLocalBBox( nPartId, b3Box, BBF_EXACT))
       return false ;
   // ne calcolo il centro e lo porto in globale
    Point3d ptCen ;