diff --git a/LuaLibs/FacesBySaw.lua b/LuaLibs/FacesBySaw.lua
index 83d6c26..6a6e0fd 100644
--- a/LuaLibs/FacesBySaw.lua
+++ b/LuaLibs/FacesBySaw.lua
@@ -259,6 +259,14 @@ function FacesBySaw.MakeOne( nSurfId, nFacet, sCutting, dSawDiam, Par5, dVzLimDw
                bInvert = true
                nOrthoOpposite = nOrthoOppositeAlternative
                vtOrthO = vtOrthOAlternative
+               -- avendo riassegnato la direzione di lavoro, i dati della linea vanno ricalcolati
+               ptP1, ptPm, ptP2, vtV1, vtV2, dLen, dWidth = EgtSurfTmFacetOppositeSide( nSurfId, nFacet, BL.GetVersRef( nOrthoOpposite), GDB_ID.ROOT)
+               if not dLen or dLen < 1.1 or not dWidth or dWidth < 1.1 then
+                  local sWarn = 'Face ' .. string.format( '%d,%d', nSurfId, nFacet) .. ' skipped : too small'
+                  EgtOutLog( sWarn, 1)
+                  return true, ''
+               end
+               vtV1 = - vtV1
             elseif bIsMachiningDownwards or not bIsMachiningUpwards then
                bInvert = true
             else