Quote:
Originally Posted by Lowfategg
Being that I am new to FRC being from FTC I don't really know the advantages and disadvantages of a planetary transmission (since my FRC team did not play with them). From what I can see I love the idea of them and they seem like they would be very good. But from what your saying the Dewalts are good because of there size.
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In short, planetary gearboxes are a much more compact method of getting reductions than standard spur gears, but are far less efficient.
For instance compare the banebots transmission to the AndyMark toughboxes.
http://banebots.com/pc/P80A-nnnn-000...80A-43-0005-R2
http://andymark.biz/am-0145.html
While the banebot's transmissions had other issues in reliability that caused them to be unpopular, the differences in dimensions for gearboxes with essentially the same reduction are apparent. This is magnified even further when comparing a shifting transmission such as the
AndyMarks to a
DeWalt.
http://en.wikipedia.org/wiki/Spur_gear#Spur_gears
http://en.wikipedia.org/wiki/Planetary_transmission