Archie wrote:

Herringbone is great, no thrust, great
load capacity, and....expensive.

Archie

Bill Freeman wrote:

I agree 100%.  I saw a lot of these years
ago when I worked at a major chemical process
company. They were popular for just the reasons
you state, and there was enough loss of profit
during downtime that the very long life due to
excellent load balance and smooth, quiet running
was well worth the high first cost.

It would really be neat to have a
herringbone planetary set with a slightly
flexible external ring gear to permit enough
flex under load to ensure uniform loads on
the planet gears.  Dream on.

Bill

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