diff --git a/LuaLibs/PreSimulationLib.lua b/LuaLibs/PreSimulationLib.lua
index 417d128..ef2d5ba 100644
--- a/LuaLibs/PreSimulationLib.lua
+++ b/LuaLibs/PreSimulationLib.lua
@@ -301,16 +301,14 @@ local function MoveMachineAxesToPosition( ptOnToolTipCenter, vtHead, vtAux)
       EgtSetAxisPos( AxesNames[6], dRotative3)
    end
 
-   return dTHome - dLinear1, AxesNames
+   return dLinear1 - dTHome
 end
 
 -------------------------------------------------------------------------------------------------------------
 local function CheckCollisionPoint( sAxis, ptOnToolTipCenter, vtHead, vtAux, Part, bCannotSplitRestLength, sRestLengthSideForPreSimulation, bCheckOnlyRestlength)
 
    -- spostamento assi macchina in posizione
-   local dDeltaXBeamOffset = MoveMachineAxesToPosition( ptOnToolTipCenter, vtHead, vtAux)
-   -- spostamento trave in posizione macchina (è da riportare in posizione originale prima di return)
-   EgtMove( Part.idRaw, Vector3d( dDeltaXBeamOffset, 0, 0), GDB_RT.GLOB)
+   local dDeltaXHeadOffset = MoveMachineAxesToPosition( ptOnToolTipCenter, vtHead, vtAux)
 
    -- si recuperano gli id delle geometrie dell'asse con cui controllare la collisione
    local idCollisionGroup = EgtGetFirstNameInGroup( EgtGetAxisId( sAxis), 'COLLISION')
@@ -321,14 +319,18 @@ local function CheckCollisionPoint( sAxis, ptOnToolTipCenter, vtHead, vtAux, Par
    local CollisionSurfTmId = {}
    for i = 1, #CollisionGroupEntitiesId do
       if EgtGetType( CollisionGroupEntitiesId[i]) == GDB_TY.SRF_MESH then
-         table.insert( CollisionSurfTmId, CollisionGroupEntitiesId[i])
+         local idCollisionSurfTmCopy = EgtCopyGlob( CollisionGroupEntitiesId[i], Part.idTempGroup)
+         EgtMove( idCollisionSurfTmCopy, Vector3d( dDeltaXHeadOffset, 0, 0), GDB_RT.GLOB)
+         table.insert( CollisionSurfTmId, idCollisionSurfTmCopy)
       end
    end
    -- se presenti geometrie nel gruppo other si aggiungono anche quelle
    if CollisionGroupOtherEntitiesId and #CollisionGroupOtherEntitiesId > 0 then
-      for i = 1, #CollisionGroupEntitiesId do
-         if EgtGetType( CollisionGroupEntitiesId[i]) == GDB_TY.SRF_MESH then
-            table.insert( CollisionSurfTmId, CollisionGroupEntitiesId[i])
+      for i = 1, #CollisionGroupOtherEntitiesId do
+         if EgtGetType( CollisionGroupOtherEntitiesId[i]) == GDB_TY.SRF_MESH then
+            local idCollisionOtherSurfTmCopy = EgtCopyGlob( CollisionGroupOtherEntitiesId[i], Part.idTempGroup)
+            EgtMove( idCollisionOtherSurfTmCopy, Vector3d( dDeltaXHeadOffset, 0, 0), GDB_RT.GLOB)
+            table.insert( CollisionSurfTmId, idCollisionOtherSurfTmCopy)
          end
       end
    end
@@ -357,8 +359,6 @@ local function CheckCollisionPoint( sAxis, ptOnToolTipCenter, vtHead, vtAux, Par
 
       -- se trovata collisione con pezzo è inutile procedere con il grezzo
       if bCollisionFoundPiece then
-         -- si riporta la trave in posizione originale
-         EgtMove( Part.idRaw, Vector3d( -dDeltaXBeamOffset, 0, 0), GDB_RT.GLOB)
 
          return true
       end
@@ -368,7 +368,6 @@ local function CheckCollisionPoint( sAxis, ptOnToolTipCenter, vtHead, vtAux, Par
    local bCollisionFoundRestLength = false
    if not ( bCollisionFoundPiece or bCannotSplitRestLength) then
       local idRestLengthSurfFr = GetRestlengthSurfTm( Part, sRestLengthSideForPreSimulation)
-      EgtMove( idRestLengthSurfFr, Vector3d( dDeltaXBeamOffset, 0, 0), GDB_RT.GLOB)
       if idRestLengthSurfFr then
          for i = 1, #CollisionSurfTmId do
             bCollisionFoundRestLength = EgtCDeSolidSolid( idRestLengthSurfFr, CollisionSurfTmId[i], BeamData.COLL_SIC)
@@ -385,9 +384,6 @@ local function CheckCollisionPoint( sAxis, ptOnToolTipCenter, vtHead, vtAux, Par
       end
    end
 
-   -- si riporta la trave in posizione originale
-   EgtMove( Part.idRaw, Vector3d( -dDeltaXBeamOffset, 0, 0), GDB_RT.GLOB)
-
    return false, bCollisionFoundRestLength
 end
 
diff --git a/StrategyLibs/FACEBYBLADE.lua b/StrategyLibs/FACEBYBLADE.lua
index c81c03a..1a6585d 100644
--- a/StrategyLibs/FACEBYBLADE.lua
+++ b/StrategyLibs/FACEBYBLADE.lua
@@ -232,6 +232,9 @@ function FACEBYBLADE.Make( Proc, Part, FaceToMachine, EdgeToMachine, OptionalPar
          Tool = TOOLS[Cutting.nToolIndex],
          dDepthToMachine = dDepthToMachine
       }
+      if OppositeToolDirectionMode == 'Enabled' then
+         BladeEngagementParameters.Edge = EdgeToMachineOpposite
+      end
       local BladeEngagementOptionalParameters = {
          bIsDicing = bIsDicing,
          sRestLengthSideForPreSimulation = sRestLengthSideForPreSimulation,