On 31 October 2013 16:14, Todd                      Zuercher
<[email protected]> wrote:
>
> Is there a rule of thum for judging the ware on a racks and pinion?

The way my dad measured gear backlash (which is indicative of wear,
especially if you know what it should be) was to run a length of
solder through the meshing gears.

On the big gears[1], they would use a thick solder.

Helical gears will run smoother, if you are replacing everything.
Double-helical biased sideways can be adjusted to have no backlash.


[1]  http://www.davidbrown.cn/products/girth%20gear%20large.jpg
-- 
atp
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