Photo motor bell unstated

The request

The attached photo shows part of the bell of a brushless outrunner motor lying on my desk. It runs out of the frame, and the white printed hub with the four screws is a separate part I made — ignore it. The bell is 91 mm in outer diameter and 28.77 mm tall, with a 40 mm central boss and an 8 mm centre bore. Reproduce the spoke pattern you can see in the photo — how many spokes there are, how wide they are, and what each one does on its way out to the rim — and complete the part that is out of frame by the pattern's own symmetry: an open-bottomed can with that spoked face on top. Z up, the spoked face at the top, the bell's axis through the origin, one spoke pointing along +X. Name the sub-part `bell`.

What the AI judge checks

• The overall form matches the reference: the same kind of object, the same silhouette from the matching angle, allowing for the requested change: the photograph shows only part of the bell; compare the visible part and expect the rest to repeat it six-fold
• Proportions match: the relative sizes of the major dimensions agree with the reference within what the eye can judge, allowing for the requested change: the photograph shows only part of the bell; compare the visible part and expect the rest to repeat it six-fold
• Every major feature visible in the reference (holes, slots, bosses, tabs, lips) is present in the result, allowing for the requested change: the photograph shows only part of the bell; compare the visible part and expect the rest to repeat it six-fold
• Those features sit where the reference has them, allowing for the requested change: the photograph shows only part of the bell; compare the visible part and expect the rest to repeat it six-fold
• Nothing is present that the reference does not show — no decorative or unexplained geometry, allowing for the requested change: the photograph shows only part of the bell; compare the visible part and expect the rest to repeat it six-fold
• Each spoke splits into two thin arms that curve into the rim, the way the photo shows — not straight spokes and not round holes
• The arms' arcs continue down the outer wall as openings in the side of the can

Measured checks

• watertight (gate)
• one sub-part named bell (gate)
• outer diameter is 91 mm
• height is 28.77 mm
• the can is hollow
• the boss is solid around the bore
• the bore clears 8 mm
• the end face is mostly open
• six spoke roots
• six windows between the spokes
• every spoke forks before the rim