import cadquery as cq

# These can be modified rather than hardcoding values for each dimension.
length = 80.0               # Length of the block
height = 60.0               # Height of the block
thickness = 10.0            # Thickness of the block
center_hole_dia = 22.0      # Diameter of center hole in block

# Create a block based on the dimensions above and add a 22mm center hole.
# 1.  Establishes a workplane that an object can be built on.
# 1a. Uses the X and Y origins to define the workplane, meaning that the
# positive Z direction is "up", and the negative Z direction is "down".
# 2.  The highest (max) Z face is selected and a new workplane is created on it.
# 3.  The new workplane is used to drill a hole through the block.
# 3a. The hole is automatically centered in the workplane.
result = cq.Workplane("XY").box(length, height, thickness) \
    .faces(">Z").workplane().hole(center_hole_dia)

# Displays the result of this script
build_object(result)