diff --git a/LuaLibs/ProcessLapJoint.lua b/LuaLibs/ProcessLapJoint.lua
index e9de2f6..2ca42cd 100644
--- a/LuaLibs/ProcessLapJoint.lua
+++ b/LuaLibs/ProcessLapJoint.lua
@@ -5458,7 +5458,7 @@ function SawPlusChain.Chainsaw.CalculateMachiningParameters( Proc, FaceToMachine
    Mortising.SuggestedAngles = {}
    Mortising.SuggestedAngles.Index = 1
    Mortising.SuggestedAngles.VtN = FaceToMachine.VtN
-   Mortising.SuggestedAngles.VtOrthO = EdgeToMachine.ToolDirection
+   Mortising.SuggestedAngles.VtOrtho = EdgeToMachine.ToolDirection
    -- approccio e retrazione
    Mortising.LeadIn, Mortising.LeadOut = SawPlusChain.CalculateLeadInOut( Mortising, EdgeToMachine)
    -- eventuale step verticale