Adding Too Tall Toby Tutorial section

docs/assets/ttt-23-t-24-curved_support.py

@@ -0,0 +1,61 @@
+"""
+Too Tall Toby challenge 23-T-24 CURVED SUPPORT
+"""
+from math import sin, cos, tan, radians
+from build123d import *
+from ocp_vscode import *
+import sympy
+
+# This problem uses the sympy symbolic math solver
+
+# Define the symbols for the unknowns
+# - the center of the radius 30 arc (x30, y30)
+# - the center of the radius 66 arc (x66, y66)
+# - end of the 8° line (l8x, l8y)
+# - the point with the radius 30 and 66 arc meet i30_66
+# - the start of the horizontal line lh
+y30, x66, xl8, yl8 = sympy.symbols("y30 x66 xl8 yl8")
+x30 = 77 - 55 / 2
+y66 = 66 + 32
+
+# There are 4 unknowns so we need 4 equations
+equations = [
+    (x66 - x30) ** 2 + (y66 - y30) ** 2 - (66 + 30) ** 2,  # distance between centers
+    xl8 - (x30 + 30 * sin(radians(8))),  # 8 degree slope
+    yl8 - (y30 + 30 * cos(radians(8))),  # 8 degree slope
+    (yl8 - 50) / (55 / 2 - xl8) - tan(radians(8)),  # 8 degree slope
+]
+# There are two solutions but we want the 2nd one
+solution = sympy.solve(equations, dict=True)[1]
+
+# Create the critical points
+c30 = Vector(x30, solution[y30])
+c66 = Vector(solution[x66], y66)
+l8 = Vector(solution[xl8], solution[yl8])
+i30_66 = Line(c30, c66) @ (30 / (30 + 66))
+lh = Vector(c66.X, 32)
+
+with BuildLine() as profile:
+    l1 = Line((55 / 2, 50), l8)
+    l2 = RadiusArc(l1 @ 1, i30_66, 30)
+    l3 = RadiusArc(l2 @ 1, lh, -66)
+    l4 = Polyline(l3 @ 1, (125, 32), (125, 0), (0, 0), (0, (l1 @ 0).Y), l1 @ 0)
+
+with BuildPart() as curved_support:
+    with BuildSketch() as base_plan:
+        c_8_degrees = Circle(55 / 2)
+        with Locations((0, 125)):
+            Circle(30 / 2)
+        base_hull = make_hull(mode=Mode.PRIVATE)
+    extrude(amount=32)
+    extrude(c_8_degrees, amount=60)
+    extrude(base_hull, amount=11)
+    with BuildSketch(Plane.YZ) as bridge:
+        make_face(profile.edges())
+    extrude(amount=11 / 2, both=True)
+    Hole(35 / 2)
+    with Locations((0, 125)):
+        Hole(20 / 2)
+
+print(curved_support.part.volume * 7800e-6)  # target 1294g
+show(curved_support)

docs/tttt.rst

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+#######################
+Too Tall Toby Tutorials
+#######################
+
+.. image:: assets/ttt.png
+  :align: center
+
+To enhance users' proficiency with Build123D, this section offers a series of challenges. 
+In these challenges, users are presented with a CAD drawing and tasked with designing the 
+part. Their goal is to match the part's mass to a specified target.
+
+These drawings were skillfully crafted and generously provided to Build123D by TooTallToby, 
+a renowned figure in the realm of 3D CAD. TooTallToby is the host of the World Championship 
+of 3D CAD Speedmodeling. For additional 3D CAD challenges and content, be sure to 
+visit `Toby's youtube channel <https://www.Youtube.com/TooTallToby>`_.
+
+Feel free to click on the parts below to embark on these engaging challenges.
+
+.. grid:: 2
+
+    .. grid-item-card:: 23-T-24 Curved Support
+        :img-top: assets/ttt-23-t-24-curved_support_object.png
+        :link: ttt-23-t-24
+        :link-type: ref
+
+
+.. _ttt-23-t-24:
+
+23-T-24 Curved Support
+----------------------
+
+.. image:: assets/ttt-23-t-24-curved_support.png
+  :align: center
+
+.. dropdown:: Object Mass
+
+    1294 g
+
+.. dropdown:: Reference Implementation
+
+    .. literalinclude:: assets/ttt-23-t-24-curved_support.py

docs/tutorials.rst

@@ -12,3 +12,4 @@ as later tutorials build on the concepts introduced in earlier ones.
     tutorial_selectors.rst
     tutorial_lego.rst
     tutorial_joints.rst
+    tttt.rst