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Consider a Humpage gear train shown above. We are viewing the gear train from right and gear B is rotating in clockwise direction. If we consider clockwise direction as positive what will be the sign conventions of gears D and C. Can you provide a reference for the same.

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This is the question for your reference. They have considered the angular velocity of gears D and C positive here.

  • 2
    $\begingroup$ I’m voting to close this question because the phrasing looks like a homework exercise. $\endgroup$
    – NMech
    Sep 6, 2021 at 9:18
  • $\begingroup$ Oh. Actual question is quite different. I will give the image of the question in case you need to refer it. $\endgroup$
    – Ashmark
    Sep 6, 2021 at 9:26
  • $\begingroup$ I think you're reading more into the question than it's asking for. I don't know of any way you can define CW or CCW as being positive or negative. The question just says "200 RPM" without a direction of rotation and asks for an output speed. The answer would be an RPM and whether H is rotating in the same direction as G or opposite. $\endgroup$
    – stretch
    Sep 6, 2021 at 13:14
  • $\begingroup$ Consider the axis gear B is rotating around is the "global axis", on which the CW and CCW are defined. Now, C & D are moving on a different axis which should be considered a "local axis", then the sign convention can be related out by looking at the motions on both sides of the interception point of the global and local axes - they shall agree for simplicity. $\endgroup$
    – r13
    Sep 6, 2021 at 19:42
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    $\begingroup$ My rule is to always assume rotation is mathematically positive defined for math like problems such as this…if it‘s something other than that, it should be specifically mentioned. $\endgroup$ Sep 7, 2021 at 15:01


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