It allows for an imperial lathe to cut metric pitches.forgive my ignorance, but why is 127 a special number for gear teeth?
Other than the odd number, that gear could still be used instead of a 127 tooth. The error would be less than 1%
forgive my ignorance, but why is 127 a special number for gear teeth?
in combination with a 5 tooth gear? Surely it is the ratio that matters. This must be some kind of standard that I know nothing aboutIt allows for an imperial lathe to cut metric pitches.
in combination with a 5 tooth gear? Surely it is the ratio that matters. This must be some kind of standard that I know nothing about
Yes, all imperial units have been redefined in terms of SI ones. Inches and feet, pounds weight and force, acceleration. Everything.There are EXACTLY 2.54 cm in one inch. 254 / 2 = 127. So a 127 (or a 254) gear provides for a perfect metric imperial conversion.
A 254 gear is too big. 127 is the smallest gear that can serve this perfect function.
127 is also a prime number, so no further factorization is possible. Surely there are other tooth counts that generate the same _exact_ ratio. But I guess this is the simplest / standard one
That was painful. Especially for an old guy with one good eye......
But I totally and completely deserved that. Kudos to you for very kindly and gently getting me to do it.
Truth be known, I never did finish. I've probably tried 6 times now. Each time I thought I was gunna make it, that part in the shadow kicked me so hard I lost count!
I'm still laughing.