Dave and List,
Of course everyone's entitled to his own opinion, but I feel the need to
quote Wikipedia on this subject:
"Some designs use "compound planets" which have two differently-sized gears
on either end of a common casting. The large end engages the sun, while the
small end engages the annulus. This may be necessary to achieve smaller step
changes in gear ratio when the overall package size is limited. Compound
planets have "timing marks" and must be assembled in the correct initial
orientation relative to each other, or their teeth will not simultaneously
engage the sun and annulus at opposite ends of the planet, leading to very
rough running and short life."
So, the alignment or "timing" marks serve a much greater purpose than simply
"ease of installation".
Ed Woods
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