Sir,
Please note that last stage gear backlash results in lost motion; the size of your drive pinion enters here as well. If you have a given backlash AND a large drive pinion (4", for example), you will have twice as much lost motion as when using a 2" diameter pinion. In order to have a good operating system, one would like to have several pinion/rack teeth in contact at a time, so smaller diameter pinions -> finer gear pitch.
If you take a careful look at your entire machine, you will likely have several places where there is springiness/lost motion, so the very low gearbox backlash may well not be as significant in terms of the overall machine performance.
Rergards,
Jack C. |