diff --git a/LuaLibs/ProcessSplit.lua b/LuaLibs/ProcessSplit.lua
index 5294bdb..b40c9a4 100644
--- a/LuaLibs/ProcessSplit.lua
+++ b/LuaLibs/ProcessSplit.lua
@@ -367,7 +367,7 @@ function ProcessSplit.Make( Proc, nPhase, nRawId, nPartId, nOrd, sDownOrSideOrSt
          elseif 0.5 * b3Raw:getDimY() + BD.CUT_EXTRA_MIN < min( dChainSawMaxMat, dChainSawLen - BD.C_SIMM_ENC) + 10 * GEO.EPS_SMALL then
             bigSectionSplitType = "double vertical"
          -- altrimenti taglio con sega a catena da sopra e con lama da sotto
-         elseif BD.DOWN_HEAD and ( b3Raw:getDimZ() + 2 * BD.CUT_EXTRA_MIN < dSawMaxDepth2 + dChainSawMaxMat + 10 * GEO.EPS_SMALL) then
+         elseif BD.DOWN_HEAD and ( b3Raw:getDimZ() + BD.CUT_EXTRA_MIN < dSawMaxDepth2 + dChainSawMaxMat + 10 * GEO.EPS_SMALL) then
             bigSectionSplitType = "double horizontal"
          end
 
@@ -399,12 +399,12 @@ function ProcessSplit.Make( Proc, nPhase, nRawId, nPartId, nOrd, sDownOrSideOrSt
             if not bOk then return bOk, sErr, nNewPhase end
          elseif bigSectionSplitType == "double horizontal" then
             -- sega a catena da sopra
-            local dChainSawCutDepth = b3Raw:getDimZ() + 2 * BD.CUT_EXTRA_MIN - dSawMaxDepth2
+            local dChainSawCutDepth = b3Raw:getDimZ() + BD.CUT_EXTRA_MIN - dSawMaxDepth2
             local sNotesSplit = 'Presplit;'
             local bOk, sErr = MakeSplitByChainSaw( Proc.Id, MCH_MILL_FU.PARAL_TOP, dChainSawCutDepth, sNotesSplit, dOffs)
             if not bOk then return bOk, sErr, nNewPhase end
             -- lama da sotto
-            local dCutExtra = -dChainSawCutDepth + 2 * BD.CUT_EXTRA_MIN
+            local dCutExtra = -dChainSawCutDepth + BD.CUT_EXTRA_MIN
             local dVzLimDwnUp
             if BD.TURN then dVzLimDwnUp = -2 end
             local sNotes = 'Split;'