Re: [CAD_CAM_EDM_DRO] 20 degree gear racks

I am not opposed to using anything at this point. It's just that all
the posts I have read indicate that 20 Degree is the new way to go for
smoothness. But if I can get accuracy and good life expectancy from
14.5 degree then that is fine by me. I plan to spring load my final
drive pinion gear into the rack to eliminate backlash. This is my first
machine so it needs to be on the cheap. If the whole cnc thing works
out for me then the next machine will involve things like Blanchard
Grinders and Ball Screws instead of Sand Paper and Gear Racks :)

Tyson, Rainy Oregon

--- Robert Colin Campbell <bob@...> wrote:

> Tyson,
>
> Let me jump in here with a different suggestion that may help
> someone.
>
> John Johnson at Ez-Router will sell their very nice belt reduction
> drives
> and 6' of track. They use 14.5 deg rack and pinion gears. After
> talking with
> John, he has me convinced that 14.5 deg is the way to go.
>
> Their rack is not drilled, but I have been assured that only the
> outside is
> hardened and once you get through the surface the drilling gets
> easer.
>
> I have a project coming up soon and I will be taking John up on his
> offer.
>
> Ez-Router also uses Bishop Wisecarver wheels.
>
> Robert Colin Campbell

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