diff --git a/LuaLibs/WProcessFreeContour.lua b/LuaLibs/WProcessFreeContour.lua
index df6a386..17a2fd2 100644
--- a/LuaLibs/WProcessFreeContour.lua
+++ b/LuaLibs/WProcessFreeContour.lua
@@ -89,7 +89,7 @@ function WPF.Classify( Proc, b3Raw)
    elseif nCntType == 10 or nCntType == 20 then
       return true
    -- se altrimenti profilo verticale che non interessa tutta la sezione e non caso speciale con lamatura affondata
-   elseif ( Proc.Box:getMax():getZ() < b3Raw:getMax():getZ() - 2) and ( ( not nTool_ID == WD.RECESSED_COUNTERBORE_TOOLID) or ( not EgtCurveIsACircle( AuxId))) then
+   elseif ( Proc.Box:getMax():getZ() < b3Raw:getMax():getZ() - 2) and ( ( not nTool_ID == ( WD.RECESSED_COUNTERBORE_TOOLID or 0)) or ( not EgtCurveIsACircle( AuxId))) then
       return false
    -- altrimenti è profilo verticale che interessa tutta la sezione o caso speciale con lamatura affondata
    else
@@ -101,8 +101,8 @@ end
 -- Classificazione del flip della feature per nesting
 -- return nFlip0, nFlip1
 function WPF.FlipClassify( Proc, b3Raw)
-   local nFlip0 = 0 
-   local nFlip1 = 0 
+   local nFlip0 = 0
+   local nFlip1 = 0
    
    -- verifico se di tipo pocket
    local bPocket = ( EgtGetInfo( Proc.Id, 'PCKT', 'i') == 1)
@@ -2187,8 +2187,8 @@ local function MakeByMill( Proc, nRawId, b3Raw)
       EgtSetMachiningParam( MCH_MP.WORKSIDE, MCH_MILL_WS.RIGHT)
    end
    -- se lamatura affondata speciale, setto attacco e stacco al centro
-   local bIsRecessedCounterBore = ( Proc.Box:getMax():getZ() < b3Raw:getMax():getZ() - 10 * GEO.EPS_SMALL) and
-                                  ( nTool_ID == WD.RECESSED_COUNTERBORE_TOOLID) and
+   local bIsRecessedCounterBore = ( Proc.Box:getMax():getZ() < b3Raw:getMax():getZ() + 10 * GEO.EPS_SMALL) and
+                                  ( nTool_ID == WD.RECESSED_COUNTERBORE_TOOLID or 0) and
                                   ( EgtCurveIsACircle( AuxId))
    if bIsRecessedCounterBore then
       local _, _, _, dContourRadius = EgtCurveIsACircle( AuxId)
@@ -2204,6 +2204,16 @@ local function MakeByMill( Proc, nRawId, b3Raw)
       EgtSetMachiningParam( MCH_MP.LOTANG, 0)
       EgtSetMachiningParam( MCH_MP.LOPERP, dContourRadius - 0.5 * dMillDiam)
       EgtSetMachiningParam( MCH_MP.LOELEV, 0)
+      -- imposto step
+      local dMaxMat = EgtTdbGetCurrToolParam( MCH_TP.MAXMAT) or 0
+      local dStep = EgtGetMachiningParam( MCH_MP.STEP)
+      if dStep < GEO.EPS_SMALL then dStep = 0.75 * dMaxMat end
+      local nStep = ceil( ( dDepth - dMaxMat) / dStep)
+      dStep = max( ( dDepth - dMaxMat) / max( nStep, 1), 0)
+      local dMaxElev = max( ( nStep + 1) * dStep - GEO.EPS_SMALL, 0)
+      EgtSetMachiningParam( MCH_MP.STEP, dStep)
+      -- imposto elevazione
+      EgtSetMachiningParam( MCH_MP.USERNOTES, 'MaxElev=' .. EgtNumToString( dMaxElev, 1) .. ';')
    end
    -- posizione braccio porta testa
    local nSCC = MCH_SCC.ADIR_ZP