initial commit

lego_test.py

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+#####
+# Inputs
+######
+lbumps = 6       # number of bumps long
+wbumps = 2       # number of bumps wide
+thin = True      # True for thin, False for thick
+
+#
+# Lego Brick Constants-- these make a Lego brick a Lego :)
+#
+pitch = 8.0
+clearance = 0.1
+bumpDiam = 4.8
+bumpHeight = 1.8
+if thin:
+    height = 3.2
+else:
+    height = 9.6
+
+t = (pitch - (2 * clearance) - bumpDiam) / 2.0
+postDiam = pitch - t  # works out to 6.5
+total_length = lbumps*pitch - 2.0*clearance
+total_width = wbumps*pitch - 2.0*clearance
+
+# make the base
+s = cq.Workplane("XY").box(total_length, total_width, height)
+
+# shell inwards not outwards
+s = s.faces("<Z").shell(-1.0 * t)
+
+# make the bumps on the top
+s = (s.faces(">Z").workplane().
+    rarray(pitch, pitch, lbumps, wbumps, True).circle(bumpDiam / 2.0)
+    .extrude(bumpHeight))
+
+# add posts on the bottom. posts are different diameter depending on geometry
+# solid studs for 1 bump, tubes for multiple, none for 1x1
+tmp = s.faces("<Z").workplane(invert=True)
+
+if lbumps > 1 and wbumps > 1:
+    tmp = (tmp.rarray(pitch, pitch, lbumps - 1, wbumps - 1, center=True).
+        circle(postDiam / 2.0).circle(bumpDiam / 2.0).extrude(height - t))
+elif lbumps > 1:
+    tmp = (tmp.rarray(pitch, pitch, lbumps - 1, 1, center=True).
+        circle(t).extrude(height - t))
+elif wbumps > 1:
+    tmp = (tmp.rarray(pitch, pitch, 1, wbumps - 1, center=True).
+        circle(t).extrude(height - t))
+else:
+    tmp = s