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same ratio dfferent gears

6340 Views 64 Replies 19 Participants Last post by  stoner
hy would some one like to explain the different combo,s, and why. take a 3-1 ratio, the standard is 9-27. going to extremes, what about 7-21 or 11-33 there must be a difference and i,d like to know. a euro sport runs 6-1 6-36 why. john
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I don't really think that's the question Mr Cahill, sorry.

Let's try it this way. Given a ratio of 3:1 why is it that a 27t contrate and 9t pinion is a preferable way of achieving it to another match, say 30t contrate and a 10t pinion. Both give the same effective gearing ratio. In fact, given that the pairings achieve the same ratio will there be any observable or measurable difference, assuming that both pairings are matched in pitch.

Now, an answer on a really simple first principle (logic based?) says that the motor will have to work harder to turn the larger pairing than the smaller, and therefore more work will be wasted in noise or heat rather than propulsion.

So, then what if the same ratio is used with smaller numbers of teeth (but still matched in pitch) and use a hypothetical 21t contrate matched with a 7t pinion? Repeat, hypothetical exercise. Should there not be less work required to force the rotation of the smaller gears and be less output wasted?

Is there an engineer in the house?

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John, the Mr Cahill was only to save some confusion. I do hope no offense was taken with that.

I also hope others are finding the information contained in this thread as interesting as I am.
QUOTE (Mr Modifier @ 26 Apr 2012, 00:29) <{POST_SNAPBACK}>I think Flange has the right approach - forget the theory - give it a go and find out what works for you.
Of course, there is always the problem of observation being coloured by expectation, unless you went through double blind testing.
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