From ffa9b78df19931ebb8a561257b552f2be82d14d0 Mon Sep 17 00:00:00 2001
From: Russell Johnson <47639332+Russ4262@users.noreply.github.com>
Date: Tue, 1 Dec 2020 09:20:40 -0600
Subject: [PATCH] Path: Address problem with rounding issue

Translate removal shape down into buffer zone to offset rounding issue.
---
 src/Mod/Path/PathScripts/PathMillFace.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Mod/Path/PathScripts/PathMillFace.py b/src/Mod/Path/PathScripts/PathMillFace.py
index 172891a466..45a620dc26 100644
--- a/src/Mod/Path/PathScripts/PathMillFace.py
+++ b/src/Mod/Path/PathScripts/PathMillFace.py
@@ -203,9 +203,11 @@ class ObjectFace(PathPocketBase.ObjectPocket):
                                                 plane=planeshape)
             ofstShape.translate(FreeCAD.Vector(0.0, 0.0, psZMin - ofstShape.BoundBox.ZMin))
 
-            custDepthparams = self._customDepthParams(obj, obj.StartDepth.Value + 0.1, obj.FinalDepth.Value - 0.1)  # only an envelope
+            # Calculate custom depth params for removal shape envelope, with start and final depth buffers
+            custDepthparams = self._customDepthParams(obj, obj.StartDepth.Value + 0.2, obj.FinalDepth.Value - 0.1)  # only an envelope
             ofstShapeEnv = PathUtils.getEnvelope(partshape=ofstShape, depthparams=custDepthparams)
             env = ofstShapeEnv.cut(baseShape)
+            env.translate(FreeCAD.Vector(0.0, 0.0, -0.000001))  # lower removal shape into buffer zone
 
         if holeShape:
             PathLog.debug("Processing holes and face ...")