Adding draft example to docs

docs/examples_1.rst

@@ -34,6 +34,11 @@ Most of the examples show the builder and algebra modes.
             :link: examples-canadian_flag
             :link-type: ref
 
+    .. grid-item-card:: Cast Bearing Unit |Builder|
+            :img-top: assets/examples/cast_bearing_unit.png
+            :link: examples-cast_bearing_unit
+            :link-type: ref
+
     .. grid-item-card:: Circuit Board With Holes |Builder| |Algebra|
             :img-top: assets/examples/thumbnail_circuit_board_01.png
             :link: examples-circuit_board
@@ -204,6 +209,23 @@ The builder mode example also generates the SVG file `logo.svg`.
         :end-before: [End]
 
 
+.. _examples-cast_bearing_unit:
+
+Cast Bearing Unit
+-----------------
+.. image:: assets/examples/cast_bearing_unit.png
+    :align: center
+
+This example demonstrates the creation of a castable flanged bearing housing
+using the `draft` operation to add appropriate draft angles for mold release.
+
+
+.. dropdown:: |Builder| Reference Implementation (Builder Mode)
+
+    .. literalinclude:: ../examples/cast_bearing_unit.py
+        :start-after: [Code]
+        :end-before: [End]
+
 .. _examples-canadian_flag:
 
 Canadian Flag Blowing in The Wind

examples/cast_bearing_unit.py

@@ -0,0 +1,86 @@
+"""
+An oval flanged bearing unit with tapered sides created with the draft operation.
+
+name: cast_bearing_unit.py
+by:   Gumyr
+date: May 25, 2025
+
+desc:
+
+    This example demonstrates the creation of a castable flanged bearing housing
+    using the `draft` operation to add appropriate draft angles for mold release.
+
+    ### Highlights:
+
+    - **Component Integration**: The design incorporates a press-fit bore for a
+    `SingleRowAngularContactBallBearing` and mounting holes for
+    `SocketHeadCapScrew` fasteners.
+    - **Draft Angle Application**: Vertical side faces are identified and modified
+    with a 4-degree draft angle using the `draft()` function. This simulates the
+    taper needed for cast parts to be removed cleanly from a mold.
+    - **Filleting**: All edges are filleted to reflect casting-friendly geometry and
+    improve aesthetics.
+    - **Parametric Design**: Dimensions such as bolt spacing, bearing size, and
+    housing depth are parameterized for reuse and adaptation to other sizes.
+
+    The result is a realistic, fabrication-aware model that can be used for
+    documentation, simulation, or manufacturing workflows. The final assembly
+    includes the housing, inserted bearing, and positioned screws, rendered with
+    appropriate coloring for clarity.
+
+license:
+
+    Copyright 2025 Gumyr
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+"""
+
+# [Code]
+import copy
+
+from bd_warehouse.bearing import PressFitHole, SingleRowAngularContactBallBearing
+from bd_warehouse.fastener import ClearanceHole, SocketHeadCapScrew
+from build123d import *
+from ocp_vscode import show
+
+bearing = SingleRowAngularContactBallBearing("M17-47-14")
+screw = SocketHeadCapScrew("M10-1.5", length=30 * MM, simple=False)
+
+A, A1, Db2, H, J = 26, 11, 57, 98.5, 76.5
+with BuildPart() as oval_flanged_bearing_unit:
+    with BuildSketch() as plan:
+        housing = Circle(Db2 / 2)
+        with GridLocations(J, 0, 2, 1) as bolt_centers:
+            Circle((H - J) / 2)
+        make_hull()
+    extrude(amount=A1)
+    extrude(housing, amount=A)
+    drafted_faces = oval_flanged_bearing_unit.faces().filter_by(Axis.Z, reverse=True)
+    draft(drafted_faces, Plane.XY, 4)
+    fillet(oval_flanged_bearing_unit.edges(), 1)
+    with Locations(oval_flanged_bearing_unit.faces().sort_by(Axis.Z)[-1]):
+        PressFitHole(bearing)
+    with Locations(Pos(Z=A1)):
+        with Locations(*bolt_centers):
+            ClearanceHole(screw, counter_sunk=False)
+
+oval_flanged_bearing_unit.part.color = Color(0x4C6377)
+
+# Create an assembly of all the positioned parts
+oval_flanged_bearing_unit_assembly = Compound(
+    children=[oval_flanged_bearing_unit.part, bearing.moved(bearing.hole_locations[0])]
+    + [copy.copy(screw).moved(l) for l in screw.hole_locations]
+)
+show(oval_flanged_bearing_unit_assembly)
+# [End]