diff --git a/LuaLibs/ProcessFreeContour.lua b/LuaLibs/ProcessFreeContour.lua
index 0b537cd..4b438e7 100644
--- a/LuaLibs/ProcessFreeContour.lua
+++ b/LuaLibs/ProcessFreeContour.lua
@@ -233,14 +233,16 @@ local function MakeByMill( Proc, nPhase, nRawId, nPartId, dOvmHead)
    local dDepth = abs( EgtCurveThickness( AuxId))
    local vtExtr = EgtCurveExtrusion( AuxId, GDB_RT.GLOB)
    local b3Aux = EgtGetBBoxGlob( AuxId, GDB_BB.STANDARD)
-   local bToolInv = ( vtExtr:getZ() < -0.1)
+   local bToolInv = ( vtExtr:getZ() < -0.1 and b3Aux:getDimZ() > b3Raw:getDimZ() - 5)
    local bDown = ( b3Aux:getMin():getZ() < b3Raw:getMin():getZ() + 5)
    -- verifico se in testa o coda
    local bHead = Proc.Head
    -- verifico i parametri Q per profondità smusso e per eseguirlo in esclusiva
    local nChamfer, dDepthCham, sChamfer = VerifyChamfer( Proc, AuxId, nRawId, true)
-      -- recupero la lavorazione
-   local sMilling = ML.FindMilling( 'FreeContour')
+   -- recupero la lavorazione
+   local bTopHead = ( BD.DOWN_HEAD and vtExtr:getZ() > -0.1)
+   local bDownHead = ( BD.DOWN_HEAD and vtExtr:getZ() < 0.1)
+   local sMilling = ML.FindMilling( 'FreeContour', nil, nil, nil, nil, bTopHead, bDownHead)
    if not sMilling then
       local sErr = 'Error : FreeContour not found in library'
       EgtOutLog( sErr)