diff --git a/LuaLibs/ProcessLapJoint.lua b/LuaLibs/ProcessLapJoint.lua
index b35d75c..e431417 100644
--- a/LuaLibs/ProcessLapJoint.lua
+++ b/LuaLibs/ProcessLapJoint.lua
@@ -2865,7 +2865,10 @@ local function MakeByMillAsSaw( Proc, nPhase, nRawId, nPartId, nFacInd,
       if vtN:getZ() < dVzLimDwnUp then dOffs = dOffs + dSawThick end
       -- forzatura lavorazione discorde in base a parametro Q su feature
       local nQ14Param = EgtGetInfo( Proc.Id, Q_MILL_AS_BLADE_CONVENTIONAL, 'd') or 0
-      local bForceInvert = nQ14Param == 1 or ( nQ14Param == 2 and vtN:getX() < 0.1)
+      local bForceInvert = nQ14Param == 1 or ( nQ14Param == 2 and vtN:getX() < 0.1 and Proc.AffectedFaces.Bottom)
+      if bForceInvert and i == 1 then
+         dStartDist, dEndDist = dEndDist, dStartDist
+      end
       local bOk, sErr, nMchId = Fbs.MakeOne( Proc.Id, nFacAdj, sCutting, dSawDiam, nFaceUse, dVzLimDwnUp, 0, BD.CUT_SIC, dOffs, dStartDist, dEndDist, nil, b3Raw, bForceInvert)
       if not bOk then return bOk, sErr end
       -- setto l'elevazione