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http://www.neugartusa.com/Service/faq/Plratio.pdfPlanetary Gear Ratios and Rating Ratio = (Ring gear Diameter / Sun Gear Diameter) +1 = = (Number of Ring Gear Teeth / No. of Sun-gear Teeth ) +1 Lowest practical ratio 3:1 (Planet -gear becomes very small) Note : (ratio 2:1 or smaller is NOT POSSIBLE / ratio 2:1 => Planet-gear diameter 0.0 ! =>geometrically impossible ) Highest practical reduction ratio (in one stage) 10:1 (Sun-gear becomes very small) Torque rating of the planetary gears is ratio sensitive! " Most balanced" planetary design (highest rating) is at ratio around 5:1 ....................

Answer: this is a mechanical engineering question

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