diff --git a/LuaLibs/ProcessLongCut.lua b/LuaLibs/ProcessLongCut.lua
index f2a325a..891ac4f 100644
--- a/LuaLibs/ProcessLongCut.lua
+++ b/LuaLibs/ProcessLongCut.lua
@@ -115,10 +115,10 @@ function GetProcessSpecificVectors( Proc, nFacet, nFaceUse, bInvert, sMachining)
          vtTg = ptP2 - ptP1 ;   vtTg:normalize()
       end
    end
-   local bWsRight = ( not bInvert)
+   local bWsRight = ( bInvert)
    -- Versore di riferimento
    local vtRef = Vector3d( vtTg)
-   vtRef:rotate( vtN, EgtIf( bInvert, -90, 90))
+   vtRef:rotate( vtN, 90)
    -- Versore esterno
    local vtOut = vtRef - vtRef * vtTg * vtTg ;   vtOut:normalize()
    -- Versore ausiliario (direzione braccio)
@@ -169,7 +169,7 @@ function ProcessLongCut.GetSCC( Proc, nFacet, sMachining, nFaceUse, bInvert, nCu
    elseif not BD.C_SIMM and AreSameVectorApprox( vtN, Z_AX()) then
       nSCC = MCH_SCC.ADIR_YM
    -- se Fast ( escluso caso speciale con taglio non passante e inclinato in X) posiziono l'aggregato in X per ottimizzare il pinzaggio
-   elseif not BD.C_SIMM and ( not ( bCustUseBlade and abs(vtN:getX()) > 0.009 + 5 * GEO.EPS_SMALL) or not bIsBlade) then
+   elseif not BD.C_SIMM and ( not ( bCustUseBlade and abs(vtN:getX()) > 0.009) or not bIsBlade) then
       if bAreCuttingStepsTowardsHead then
          nSCC = EgtIf( ( not ( nCuttingStep == 1 or nCuttingStep == nC - 1)), MCH_SCC.ADIR_XP, MCH_SCC.ADIR_XM)
       else
@@ -187,7 +187,12 @@ function ProcessLongCut.GetSCC( Proc, nFacet, sMachining, nFaceUse, bInvert, nCu
       end
    -- per PF o simili e lama con aggregato lo posiziono per stare il più lontano possibile dalla trave
    elseif ( bIsBlade and bIsTopBlade) then
-      nSCC = MCH_SCC.ADIR_XP
+      if abs( vtN:getX()) > 0.009 then
+         local vtAux = GetProcessSpecificVectors( Proc, nFacet, nFaceUse, bInvert, sMachining)
+         nSCC = EgtIf( ( vtAux:getY() > -GEO.EPS_SMALL), MCH_SCC.ADIR_YP, MCH_SCC.ADIR_YM)
+      else
+         nSCC = MCH_SCC.ADIR_XP
+      end
    -- per PF o simili e lama senza aggregato o fresa non do alcuna preferenza
    else
       nSCC = MCH_SCC.NONE