dimension of the motor’s diameter,
I produced a step in the bore
(Figure 3) to form a seat for the
outer section of the motor. When
that section of the bore is a close
sliding fit for the motor, the exact
depth can be set as in Figure 4.
I added a chamfer on the outer
edge to ensure it will safely clear
the motor’s wires, and then center-drilled the hole (Figures 5 and
for the fixed axle that will protrude
from the other side of the drum.
I then cut the part off to the
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