diff --git a/LuaLibs/ProcessDrill.lua b/LuaLibs/ProcessDrill.lua
index d29dd7c..7856b25 100644
--- a/LuaLibs/ProcessDrill.lua
+++ b/LuaLibs/ProcessDrill.lua
@@ -546,7 +546,7 @@ function ProcessDrill.Make( Proc, nPhase, nRawId, nPartId)
       if bIntersectionOk then
          local dHoleToCutDistance = vDistance[1]
          -- se il taglio accorcia realmente il foro
-         if dHoleToCutDistance > 10 * GEO.EPS_SMALL and dHoleToCutDistance < dLen then
+         if ( dHoleToCutDistance > 10 * GEO.EPS_SMALL or Proc.AffectedFaces.Right) and dHoleToCutDistance < dLen then
             dMaxDepth = dMaxDepthOri
             dMaxElev = dLen - dHoleToCutDistance
             bTryDrill = true