Re: spur gear rack tooth distance question.

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Troy"
><superscooby3000@y...> wrote:
> I am planning on using 14.5deg 20 pitch rack for my cnc router. I
> know that the pitch stands for the distance between teeth but
> measurement or ratio is it (inches, mm etc.)
>
> I was hoping to drill holes in my structure before I have the
>actual
> rack. I was planning on drilling and tapping my rack in between
>its
> teeth. If I knew the distance (in inches or mm) between the teeth
>I
> could go ahead with building the structure. (If that makes any
> sense)
>
> Thanks in advance
>
> Troy

The distance between teeth in a gear is know as the Circular Pitch [
CP ] This is defined as pi over the DP and in the case of a 20 DP
gear or rack is 0.157"

John S.