diff --git a/LuaLibs/BeamExec.lua b/LuaLibs/BeamExec.lua
index 562448b..9655cdb 100644
--- a/LuaLibs/BeamExec.lua
+++ b/LuaLibs/BeamExec.lua
@@ -571,29 +571,31 @@ local function GetFeatureForcedStrategy( Proc)
    if sStrategyId then
       -- eseguo file config con i parametri di default
       local StrategyData = require( sStrategyId .. '\\' .. sStrategyId .. 'Config')
-      
+
       -- se ID strategia non esiste oppure ID letto in NGE è differente da quello letto nella strategia, esco subito
       if not StrategyData or StrategyData.sStrategyId ~= sStrategyId then
          return nil
       end
-      
+
+      -- si copiano i dati
+      local UpdatedParamList = BeamLib.TableCopyDeep( StrategyData)
       -- salvo che questa strategia è stata forzata, e che quindi ho già letto il file config con i parametri di default
       -- quando si calcolerà la lavorazione non servirà leggere/riverificare i parametri di default
-      StrategyData.bForcedStrategy = true
+      UpdatedParamList.bForcedStrategy = true
       
       -- cerco e aggiorno i parametri come sono settati nel processing
-      for i = 1, #StrategyData.Parameters do
-         local sParameterToRead = StrategyData.sStrategyId .. '_' .. StrategyData.Parameters[i].sNameNge
+      for i = 1, #UpdatedParamList.Parameters do
+         local sParameterToRead = UpdatedParamList.sStrategyId .. '_' .. UpdatedParamList.Parameters[i].sNameNge
          local sForcedParameterForProc = EgtGetInfo( Proc.id, sParameterToRead, 's')
          -- se ho trovato il valore, lo sovrascrivo al default
          if sForcedParameterForProc then
-            StrategyData.Parameters[i].sValue = sForcedParameterForProc
+            UpdatedParamList.Parameters[i].sValue = sForcedParameterForProc
          end
       end
 
       -- ritorno la lista strategia con parametri
       local StrategyToProc = {}
-      table.insert( StrategyToProc, StrategyData)
+      table.insert( StrategyToProc, UpdatedParamList)
       return StrategyToProc
    end
    return nil
@@ -783,7 +785,7 @@ local function GetFeatureInfoAndDependency( vProcSingleRot, Part)
 end
 
 -------------------------------------------------------------------------------------------------------------
--- TODO contemplare anche strategie speciali
+-- caricamento librerie strategie (standard o speciali) se presenti nella Proc come strategie disponibili per questo Processing 
 local function RunStrategyLibraries( sStrategyId)
    local StrategyConfigName = sStrategyId .. '\\' .. sStrategyId .. 'Config'
    local StrategyScriptName = sStrategyId .. '\\' .. sStrategyId
diff --git a/LuaLibs/BeamLib.lua b/LuaLibs/BeamLib.lua
index 73c7ae4..d94f64d 100644
--- a/LuaLibs/BeamLib.lua
+++ b/LuaLibs/BeamLib.lua
@@ -384,16 +384,21 @@ end
 -- N.B. : I parametri personalizzati non più presenti tra i default della strategia, verranno ignorati. Quelli extra avranno valore di default
 -- Il controllo deve essere fatto SEMPRE all'inizio di ogni strategia, per controllare conformità parametri custom
 function BeamLib.GetUpdateCustomParameters( CustomStrategyParamList, DefaultStrategyParamList)
-   if CustomStrategyParamList and #CustomStrategyParamList > 0 then
-      for i = 1, #DefaultStrategyParamList do
-         for j = 1, #CustomStrategyParamList do
-            if DefaultStrategyParamList[i].sName == CustomStrategyParamList[j].sName then
-               DefaultStrategyParamList[i].sValue = CustomStrategyParamList[j].sValue
+   local UpdatedParamList = BeamLib.TableCopyDeep( DefaultStrategyParamList)
+   -- se esistono i parametri di default (normalmente ce n'è sempre almeno uno)
+   if UpdatedParamList then
+      for i = 1, #UpdatedParamList do
+         table.insert( UpdatedParamList, UpdatedParamList[i])
+         if CustomStrategyParamList then
+            for j = 1, #CustomStrategyParamList do
+               if UpdatedParamList[i].sName == CustomStrategyParamList[j].sName then
+                  UpdatedParamList[i].sValue = CustomStrategyParamList[j].sValue
+               end
             end
          end
       end
    end
-   return DefaultStrategyParamList
+   return UpdatedParamList
 end
 
 -------------------------------------------------------------------------------------------------------------
diff --git a/LuaLibs/MachiningLib.lua b/LuaLibs/MachiningLib.lua
index df79ed5..acdf399 100644
--- a/LuaLibs/MachiningLib.lua
+++ b/LuaLibs/MachiningLib.lua
@@ -216,9 +216,9 @@ function MachiningLib.FindMill( Proc, ToolSearchParameters)
       -- controlli standard
       elseif ToolSearchParameters.dMaxToolDiameter and TOOLS[i].dDiameter > ToolSearchParameters.dMaxToolDiameter then
          bIsToolCompatible = false
-      elseif ToolSearchParameters.vtToolDirection:getZ() < TOOLS[i].SetupInfo.GetMinNz( ToolSearchParameters.vtToolDirection) - GEO.EPS_ZERO and TOOLS[i].SetupInfo.HeadType.bTop then
+      elseif TOOLS[i].SetupInfo.HeadType.bTop and ToolSearchParameters.vtToolDirection:getZ() < TOOLS[i].SetupInfo.GetMinNz( ToolSearchParameters.vtToolDirection) - GEO.EPS_ZERO then
          bIsToolCompatible = false
-      elseif ToolSearchParameters.vtToolDirection:getZ() > TOOLS[i].SetupInfo.GetMaxNz( ToolSearchParameters.vtToolDirection) + GEO.EPS_ZERO and TOOLS[i].SetupInfo.HeadType.bBottom then
+      elseif TOOLS[i].SetupInfo.HeadType.bBottom and ToolSearchParameters.vtToolDirection:getZ() > TOOLS[i].SetupInfo.GetMaxNz( ToolSearchParameters.vtToolDirection) + GEO.EPS_ZERO then
          bIsToolCompatible = false
       elseif ToolSearchParameters.sMillShape == 'STANDARD' and  ( TOOLS[i].dSideAngle ~= 0 or TOOLS[i].bIsPen) then
          bIsToolCompatible = false
@@ -334,10 +334,10 @@ function MachiningLib.FindBlade( Proc, ToolSearchParameters)
       end
 
       -- check angolo limite lama
-      if ToolSearchParameters.vtN:getZ() < TOOLS[i].SetupInfo.GetMinNz( ToolSearchParameters.vtN) - GEO.EPS_ZERO then
+      if TOOLS[i].SetupInfo.HeadType.bTop and ToolSearchParameters.vtN:getZ() < TOOLS[i].SetupInfo.GetMinNz( ToolSearchParameters.vtN) - GEO.EPS_ZERO then
          bIsToolCompatible = false
       end
-      if ToolSearchParameters.vtN:getZ() > TOOLS[i].SetupInfo.GetMaxNz( ToolSearchParameters.vtN) + GEO.EPS_ZERO then
+      if TOOLS[i].SetupInfo.HeadType.bBottom and ToolSearchParameters.vtN:getZ() > TOOLS[i].SetupInfo.GetMaxNz( ToolSearchParameters.vtN) + GEO.EPS_ZERO then
          bIsToolCompatible = false
       end