Re: [CAD_CAM_EDM_DRO] Gearbox ratio

On 12/15/2013 10:30 AM, Lester Caine wrote:

> AH - looks like 143:144 comes into the equation somewhere ... 54 turns of the
> input only gives 143/144 of the output ... it's some of the maths provided which
> has to be wrong as it needs more than 54 turns to get 360 degrees on the output
> ... must be (54/143)*144 that is 54.3776223776:1 ... so is that a multiple chain
> of stages of some sort?

Try 37:11. Common enough in automotive differentials. Has a ratio of
3.363636...:1, and 3.23, 4.11, etc are really common.

Automotive differentials often use weird numbers so that there is no
modal wear. A 2:1 gear set will wear tooth 1 to tooth1, 3, 5, 7, etc.
A 2:3 set will wear all teeth evenly. On the first turn, tooth 1 will
contact tooth 1, then 3, then 2.

Dave 8{)
--

"A word to the wise ain't necessary - it's the stupid ones that need the
advice."

Bill Cosby