diff --git a/LuaLibs/FacesBySaw.lua b/LuaLibs/FacesBySaw.lua
index 82812cc..a92a874 100644
--- a/LuaLibs/FacesBySaw.lua
+++ b/LuaLibs/FacesBySaw.lua
@@ -283,7 +283,10 @@ function FacesBySaw.MakeOne( nSurfId, nFacet, sCutting, dSawDiam, Par5, dVzLimDw
    if bInvert then
       ptP1, ptP2 = ptP2, ptP1
       vtV1, vtV2 = vtV2, vtV1
-      dAccStart, dAccEnd = dAccEnd, dAccStart
+      -- se l'inversione è forzata dall'esterno, anche gli accorciamenti che arrivano dall'esterno si prendono per buoni
+      if bForceInvert == nil then
+         dAccStart, dAccEnd = dAccEnd, dAccStart
+      end
    end
    local vtTg = ptP2 - ptP1 ;   vtTg:normalize()
    local dAllStart = 0
diff --git a/LuaLibs/ProcessHeadCut.lua b/LuaLibs/ProcessHeadCut.lua
index a805c87..99557a2 100644
--- a/LuaLibs/ProcessHeadCut.lua
+++ b/LuaLibs/ProcessHeadCut.lua
@@ -252,7 +252,7 @@ local function MakeStandardCuts( Proc, b3Raw, nCuts, dOffsetBetweenCuts, HeadCut
                if not bOk then return false, sErr end
             end
             -- taglio verticale
-            local bOk, sErr = Fbs.MakeOne( Proc.Id, 0, Cutting1Data.sCutting, Cutting1Data.dSawDiam, nOrthoOpposite, nil, dCutExtra, BD.CUT_SIC, dCutXOffset, dAccStart, dAccEnd, '', b3Raw)
+            local bOk, sErr = Fbs.MakeOne( Proc.Id, 0, Cutting1Data.sCutting, Cutting1Data.dSawDiam, nOrthoOpposite, nil, dCutExtra, BD.CUT_SIC, dCutXOffset, dAccStart, dAccEnd, '', b3Raw, true)
             if not bOk then return bOk, sErr end
          end
          return true, sWarn
@@ -290,7 +290,7 @@ local function MakeStandardCuts( Proc, b3Raw, nCuts, dOffsetBetweenCuts, HeadCut
          if i == 1 and HeadCutType.sType =='Precut' then
             dCutOffset = dStartOffset
          end
-         local bOk, sErr = Fbs.MakeOne( Proc.Id, 0, Cutting1Data.sCutting, Cutting1Data.dSawDiam, nOrthoOpposite, nil, dCutExtra, BD.CUT_SIC, dCutOffset, dAccStart, dAccEnd, '', b3Raw)
+         local bOk, sErr = Fbs.MakeOne( Proc.Id, 0, Cutting1Data.sCutting, Cutting1Data.dSawDiam, nOrthoOpposite, nil, dCutExtra, BD.CUT_SIC, dCutOffset, dAccStart, dAccEnd, '', b3Raw, true)
          if not bOk then return false, sErr end
       end
    -- altrimenti necessari tagli da sopra e sotto con testa opportuna
diff --git a/LuaLibs/ProcessSplit.lua b/LuaLibs/ProcessSplit.lua
index c5dc662..36edfbc 100644
--- a/LuaLibs/ProcessSplit.lua
+++ b/LuaLibs/ProcessSplit.lua
@@ -438,7 +438,7 @@ local function MakeStandardCuts( Proc, b3Raw, nCuts, dOffsetBetweenCuts, TailCut
             if i == 1 and TailCutType.sType ~= 'Precut' then
                sInfo = 'Cut'
             end
-            local bOk, sErr = Fbs.MakeOne( Proc.Id, 0, Cutting1Data.sCutting, Cutting1Data.dSawDiam, nOrthoOpposite, nil, dCutExtra, BD.CUT_SIC, dCutXOffset, dAccStart, dAccEnd, sInfo, b3Raw)
+            local bOk, sErr = Fbs.MakeOne( Proc.Id, 0, Cutting1Data.sCutting, Cutting1Data.dSawDiam, nOrthoOpposite, nil, dCutExtra, BD.CUT_SIC, dCutXOffset, dAccStart, dAccEnd, sInfo, b3Raw, true)
             if not bOk then return false, sErr end
          end
          return true, sWarn
@@ -488,7 +488,7 @@ local function MakeStandardCuts( Proc, b3Raw, nCuts, dOffsetBetweenCuts, TailCut
          if i == nCuts and TailCutType.bHorizCut and BD.C_SIMM and not BD.DOWN_HEAD then
             sNotes = EgtSetValInNotes( sNotes, 'StartZmax', 2)
          end
-         local bOk, sErr = Fbs.MakeOne( Proc.Id, 0, Cutting1Data.sCutting, Cutting1Data.dSawDiam, nOrthoOpposite, nil, dCutExtra, BD.CUT_SIC, dCutOffset, dAccStart, dAccEnd, sNotes, b3Raw)
+         local bOk, sErr = Fbs.MakeOne( Proc.Id, 0, Cutting1Data.sCutting, Cutting1Data.dSawDiam, nOrthoOpposite, nil, dCutExtra, BD.CUT_SIC, dCutOffset, dAccStart, dAccEnd, sNotes, b3Raw, true)
          if not bOk then return false, sErr end
       end
    -- altrimenti necessari tagli da sopra e sotto con testa opportuna