diff --git a/LuaLibs/ProcessScarfJoint.lua b/LuaLibs/ProcessScarfJoint.lua
index bd7adb9..03d4d1e 100644
--- a/LuaLibs/ProcessScarfJoint.lua
+++ b/LuaLibs/ProcessScarfJoint.lua
@@ -524,9 +524,9 @@ function ProcessScarfJoint.Make( Proc, nPhase, nRawId, nPartId, dOvmHead, dOvmTa
       local dDiamMax
       -- se normale verso Y (in orizzontale)
       if abs(vtRef:getY()) > 0.866 then
-         dDiamMax = EgtIf( abs( frMor:getVersX():getZ()) < abs( frMor:getVersY():getY()), dL, dW)
+         dDiamMax = EgtIf( abs( frMor:getVersX():getZ()) - 10 * GEO.EPS_SMALL < abs( frMor:getVersY():getY()), dL, dW)
       else
-         dDiamMax = EgtIf( abs( frMor:getVersX():getY()) < abs( frMor:getVersY():getY()), dL, dW)
+         dDiamMax = EgtIf( abs( frMor:getVersX():getY()) < abs( frMor:getVersY():getY()) - 10 * GEO.EPS_SMALL, dL, dW)
       end
       -- determino la distanza tra le due facce inclinate per determinare elevazione
       local dDistFaces
@@ -536,9 +536,9 @@ function ProcessScarfJoint.Make( Proc, nPhase, nRawId, nPartId, dOvmHead, dOvmTa
          if vFaceOrd[1] ~= 0 then
             frMor, dL, dW = EgtSurfTmFacetMinAreaRectangle( Proc.Id, vFaceOrd[1]-1, GDB_ID.ROOT)
             if abs(vtRef:getY()) > 0.866 then
-               nElevationFace1 = EgtIf( abs( frMor:getVersX():getZ()) < abs( frMor:getVersY():getY()), dL, dW)
+               nElevationFace1 = EgtIf( abs( frMor:getVersX():getZ()) < abs( frMor:getVersY():getY()) - 10 * GEO.EPS_SMALL, dL, dW)
             else
-               nElevationFace1 = EgtIf( abs( frMor:getVersX():getY()) < abs( frMor:getVersY():getY()), dL, dW)
+               nElevationFace1 = EgtIf( abs( frMor:getVersX():getY()) < abs( frMor:getVersY():getY()) - 10 * GEO.EPS_SMALL, dL, dW)
             end
          end
          dDistFaces = max( abs((ptC[vFaceOrd[2]]-ptC[vFaceOrd[4]])*vtN[vFaceOrd[2]]), nElevationFace1)