diff --git a/LuaLibs/FacesBySaw.lua b/LuaLibs/FacesBySaw.lua
index 9bbb09d..83d6c26 100644
--- a/LuaLibs/FacesBySaw.lua
+++ b/LuaLibs/FacesBySaw.lua
@@ -192,7 +192,7 @@ local function GetNameSolidFaceIncludingLine( b3Solid, ptP1Comp, ptP2Comp)
 end
 
 ---------------------------------------------------------------------
-function FacesBySaw.MakeOne( nSurfId, nFacet, sCutting, dSawDiam, Par5, dVzLimDwnUp, dCutExtra, dCutSic, dCutOffset, dAccStart, dAccEnd, sNotes, b3Raw, bForceInvert, bMaximizeVerticalDepth, bSpecialTangentLeadInOut, bForceTangentLeadInOut)
+function FacesBySaw.MakeOne( nSurfId, nFacet, sCutting, dSawDiam, Par5, dVzLimDwnUp, dCutExtra, dCutSic, dCutOffset, dAccStart, dAccEnd, sNotes, b3Raw, bForceInvert, bMaximizeVerticalDepth, bSpecialTangentLeadInOut, bForceTangentLeadInOut, Par5Alternative)
    -- se lama con asse parallelo alla faccia, passo alla apposita funzione
    if ( Par5 == MCH_MILL_FU.PARAL_DOWN or
         Par5 == MCH_MILL_FU.PARAL_TOP or
@@ -209,6 +209,8 @@ function FacesBySaw.MakeOne( nSurfId, nFacet, sCutting, dSawDiam, Par5, dVzLimDw
    -- risolvo parametro ambiguo
    local nOrthoOpposite
    local vtOrthO
+   local nOrthoOppositeAlternative
+   local vtOrthOAlternative
    if isVector3d( Par5) then
       nOrthoOpposite = BL.GetNearestOrthoOpposite( Par5, vtN)
       vtOrthO = Vector3d( Par5)
@@ -216,6 +218,15 @@ function FacesBySaw.MakeOne( nSurfId, nFacet, sCutting, dSawDiam, Par5, dVzLimDw
       nOrthoOpposite = Par5
       vtOrthO = BL.GetVersRef( Par5)
    end
+   if Par5Alternative then
+      if isVector3d( Par5Alternative) then
+         nOrthoOppositeAlternative = BL.GetNearestOrthoOpposite( Par5Alternative, vtN)
+         vtOrthOAlternative = Vector3d( Par5Alternative)
+      else
+         nOrthoOppositeAlternative = Par5Alternative
+         vtOrthOAlternative = BL.GetVersRef( Par5Alternative)
+      end
+   end
    EgtOutLog( 'VtOrthO='..tostring( vtOrthO)..' FaceUse='..tostring( nOrthoOpposite), 3)
    -- verifico se testa da sotto oppure se lavorazione sotto con testa da sopra
    if not dVzLimDwnUp then dVzLimDwnUp = BL.GetNzLimDownUp( b3Raw, vtN, vtOrthO) end
@@ -235,13 +246,26 @@ function FacesBySaw.MakeOne( nSurfId, nFacet, sCutting, dSawDiam, Par5, dVzLimDw
    end
    local bIsSawCCW = ( EgtMdbGetCurrMachiningParam( MCH_MP.SPEED) < 0)
    local bInvert = bForceInvert
-   -- se la lama ruota in senso antiorario inverto la direzione di lavorazione, per avere rotazione lama opposta a avanzamento
+   -- l'inversione può essere comandata da rotazione lama (direzione concorde, legata anche a DownUp) oppure da direzione Z del percorso (si preferisce lavorare dal basso verso l'alto per limitare le corse)
+   -- se c'è disaccordo tra rotazione e direzione si cambia il lato di lavoro, se possibile. Se ciò non è possbile comanda la direzione.
    if bInvert == nil then
       if not BD.TURN or abs( ptP2:getY() - ptP1:getY()) < 250 then
-         if bIsSawCCW ~= bDownUp then
-            bInvert = ( ptP2:getZ() < ptP1:getZ() + 100 * GEO.EPS_SMALL)
+         local bIsMachiningDownwards = ( ptP2:getZ() < ptP1:getZ() - 100 * GEO.EPS_SMALL)
+         local bIsMachiningUpwards = ( ptP2:getZ() > ptP1:getZ() + 100 * GEO.EPS_SMALL)
+         if ( bIsSawCCW ~= bDownUp) and bIsMachiningDownwards then
+            bInvert = true
+         elseif ( ( bIsSawCCW ~= bDownUp) ~= bIsMachiningDownwards) then
+            if Par5Alternative then
+               bInvert = true
+               nOrthoOpposite = nOrthoOppositeAlternative
+               vtOrthO = vtOrthOAlternative
+            elseif bIsMachiningDownwards or not bIsMachiningUpwards then
+               bInvert = true
+            else
+               bInvert = false
+            end
          else
-            bInvert = ( ptP2:getZ() < ptP1:getZ() - 100 * GEO.EPS_SMALL)
+            bInvert = false
          end
       else
          local vtTmp = ptP2 - ptP1 ; vtTmp:normalize()
diff --git a/LuaLibs/ProcessCut.lua b/LuaLibs/ProcessCut.lua
index 9a9af10..0aab253 100644
--- a/LuaLibs/ProcessCut.lua
+++ b/LuaLibs/ProcessCut.lua
@@ -577,7 +577,11 @@ local function MakeFromTop( sCutting, Proc, nPhase, nRawId, nPartId, dOvmHead, b
                      dVzLimDwnUp = -0.708
                   end
                   local bSpecialTangentLeadInOut = ( i % 2 == 0) and ( Proc.AffectedFaces.Left or Proc.AffectedFaces.Right)
-                  local bOk, sErr = Fbs.MakeOne( vCuts[i][j], 0, sCutting, dSawDiam, vtOrthoO, dVzLimDwnUp, dExtraCut, BD.CUT_SIC, 0, 0, 0, sNotes, b3Raw, nil, nil, bSpecialTangentLeadInOut)
+                  local vtOrthoOAlternative
+                  if ( i % 2 == 0) and ( Proc.Fct == 1) and bNoPerpCuts then
+                     vtOrthoOAlternative = - vtOrthoO
+                  end
+                  local bOk, sErr = Fbs.MakeOne( vCuts[i][j], 0, sCutting, dSawDiam, vtOrthoO, dVzLimDwnUp, dExtraCut, BD.CUT_SIC, 0, 0, 0, sNotes, b3Raw, nil, nil, bSpecialTangentLeadInOut, nil, vtOrthoOAlternative)
                   if not bOk then return bOk, sErr end
                end
             end