diff --git a/LuaLibs/WProcessLapJoint.lua b/LuaLibs/WProcessLapJoint.lua
index bbe2040..02fba41 100644
--- a/LuaLibs/WProcessLapJoint.lua
+++ b/LuaLibs/WProcessLapJoint.lua
@@ -2015,6 +2015,10 @@ local function MakeSideGrooveByMill( Proc, nFacet, nRawId, b3Raw, sCustomMach, d
          local nStep = ceil( ( dThick - dMaxMat) / dStep)
          dStep = max( ( dThick - dMaxMat) / max( nStep, 1), 0)
          local dMaxElev = max( ( nStep + 1) * dStep - GEO.EPS_SMALL, 0)
+         -- tasca aperta sopra non necessita di MaxElev
+         if Proc.Fct == 2 and Proc.AffectedFaces.Top then
+            dMaxElev = nil
+         end
          if nSinglePass and nSinglePass > 0 then
             dStep = 0
             if nSinglePass == 1 then
@@ -2028,7 +2032,9 @@ local function MakeSideGrooveByMill( Proc, nFacet, nRawId, b3Raw, sCustomMach, d
          -- leggo eventuali note esistenti della lavorazione
          local sUserNotes = EgtGetMachiningParam( MCH_MP.USERNOTES)
          -- aggiungo alle note massima elevazione
-         sUserNotes = EgtSetValInNotes( sUserNotes, 'MaxElev', EgtNumToString( dMaxElev, 3))
+         if dMaxElev then
+            sUserNotes = EgtSetValInNotes( sUserNotes, 'MaxElev', EgtNumToString( dMaxElev, 3))
+         end
          -- se lavorazione in doppio aggiungo le rispettive note
          if Proc.Double and Proc.Double == 2 then
             sUserNotes = EgtSetValInNotes( sUserNotes, 'DOUBLE', Proc.Double)
@@ -2880,13 +2886,15 @@ local function MakeMoreFaces( Proc, nRawId, b3Raw)
          -- se ho abilitata lavorazione di fresa di fianco
          if Proc.Fct >= 3 and sMillOnSide and nUseMillOnSide >= 1 and not bIsSmallSlot then
             -- cerco nei parametri utensili la nota di affondamento di fianco SIDEDEPTH
-            local dMaxDepthOnSide = 0
+            local dMaxDepthOnSide = 999
             local dMillDiam = 0
+            local dMillDiamTh = EgtTdbGetCurrToolThDiam() or 60
             if EgtMdbSetCurrMachining( sMillOnSide) then
                local sTuuid = EgtMdbGetCurrMachiningParam( MCH_MP.TUUID)
                if EgtTdbSetCurrTool( EgtTdbGetToolFromUUID( sTuuid) or '') then
                   dMillDiam = EgtTdbGetCurrToolParam( MCH_TP.DIAM) or dMillDiam
-                  dMaxDepthOnSide = EgtTdbGetCurrToolValInNotes( MCH_TP.USERNOTES, 'SIDEDEPTH', 'd') or dMaxDepthOnSide
+                  dMillDiamTh = EgtTdbGetCurrToolThDiam() or dMillDiamTh
+                  dMaxDepthOnSide = min( EgtTdbGetCurrToolValInNotes( MCH_TP.USERNOTES, 'SIDEDEPTH', 'd') or dMaxDepthOnSide, 0.5 * ( dMillDiam - dMillDiamTh))
                end
             end
             local bMakeFirstGroove
@@ -2975,7 +2983,7 @@ local function MakeMoreFaces( Proc, nRawId, b3Raw)
       else
          local sErr = 'Side milling not possible'
          EgtOutLog( sErr)
-         return true, sErr
+         return false, sErr
       end
    -- fessura verticale
    elseif Proc.Stype == 3 then