Photo motor bell

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. Six identical spokes 6.22 mm wide run out from the boss; about 15 mm in from the rim each one forks into two 1.33 mm arms that curve out to the rim, and the arcs continue down the outer wall. Rebuild the whole bell from what the photo shows, completing the part that is out of frame by the six-fold 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