diff --git a/LuaLibs/ProcessSplit.lua b/LuaLibs/ProcessSplit.lua
index df09ffe..f64018a 100644
--- a/LuaLibs/ProcessSplit.lua
+++ b/LuaLibs/ProcessSplit.lua
@@ -672,7 +672,8 @@ function ProcessSplit.Make( Proc, nPhase, nRawId, nPartId, nOrd, sDownOrSideOrSt
       local dCutExtra2 = -dMaxVertDepth + dExtra / 2 + BD.CUT_EXTRA_MIN
       local dAccStart = 0
       -- limiti da sotto
-      local dVzLimDwnUp = -2
+      local dVzLimDwnUp
+      if BD.TURN then dVzLimDwnUp = -2 end
       -- eseguo i tagli da sotto necessari
       for i = nCuts, 1, -1 do
          local dCutOffset = ( i - 1) * dOffsL