diff --git a/LuaLibs/ProcessCut.lua b/LuaLibs/ProcessCut.lua
index 96d54ba..e69e809 100644
--- a/LuaLibs/ProcessCut.lua
+++ b/LuaLibs/ProcessCut.lua
@@ -466,23 +466,25 @@ local function MakeFromTop( sCutting, Proc, nPhase, nRawId, nPartId, dOvmHead, b
                end
             end
          end
-
-         local bDoubleCutOk = false
-         local nSurfToCut
-         if i % 2 == 0 then
-            local _, dDiceFaceH = BL.GetFaceHvRefDim( vCuts[i][1], 0)
-            bDoubleCutOk = dDiceFaceH < 2 * ( dMaxDepth - BD.CUT_EXTRA)
-            nSurfToCut = EgtSurfTmBySewing( nAddGrpId, vCuts[i], false)
-         end
+         local _, dDiceFaceH = BL.GetFaceHvRefDim( vCuts[i][1] or GDB_ID.NULL, 0)
          -- caso speciale con rischio cubetto sul motore
-         if bDangerousReliefCut and bDoubleCutOk then
+         if ( i % 2 == 0) and bDangerousReliefCut and ( dMaxDepth * 2 > dDiceFaceH + BD.CUT_EXTRA) then
+            local bDoubleCut = false
+            local nSurfToCut
+            local dCutExtra = BD.CUT_EXTRA
+            if dMaxDepth < dDiceFaceH + BD.CUT_EXTRA then
+               bDoubleCut = true
+               dCutExtra = - 0.5 * b3Raw:getDimY() + BD.CUT_EXTRA
+            end
+            nSurfToCut = EgtSurfTmBySewing( nAddGrpId, vCuts[i], false)
             local nFaceUseCut1, nFaceUseCut2 = MCH_MILL_FU.ORTHO_BACK, MCH_MILL_FU.ORTHO_FRONT
             if Proc.Tail then
                nFaceUseCut1, nFaceUseCut2 = nFaceUseCut2, nFaceUseCut1
             end
-            local dCutExtra = - 0.5 * b3Raw:getDimY() + BD.CUT_EXTRA_MIN
-            local bOk, sErr = Fbs.MakeOne( nSurfToCut, 0, sCutting, dSawDiam, nFaceUseCut1, nil, dCutExtra, BD.CUT_SIC, 0, 0, 0, '', b3Raw, true)
-            if not bOk then return false, sErr end
+            if bDoubleCut then
+               local bOk, sErr = Fbs.MakeOne( nSurfToCut, 0, sCutting, dSawDiam, nFaceUseCut1, nil, dCutExtra, BD.CUT_SIC, 0, 0, 0, '', b3Raw, true)
+               if not bOk then return false, sErr end
+            end
             local bOk2, sErr2 = Fbs.MakeOne( nSurfToCut, 0, sCutting, dSawDiam, nFaceUseCut2, nil, dCutExtra, BD.CUT_SIC, 0, 0, 0, '', b3Raw)
             if not bOk2 then return false, sErr2 end
          -- caso standard