Re: [CAD_CAM_EDM_DRO] Rack and Pinion

turbulatordude wrote:

>Hi all,
>
>I am probably missing something very simple in this.
>
>A spur gear has a unit value as the rack with a pitch diameter
>value of 1 inch. ie: a 12 pitch rack matches a 12 tooth gear when
>the pitch diameter of the gear is 1 inch.
>
>This then means the linear movement equals Pi for one revolution of
>the gear.
>
>

I'm not sure I agree with this statement.
If you have a gear with 12 teeth, and that meshes with a 12 pitch rack,
then the pitch *circumference* is 1 inch - not the diameter.
One revolution will be 12 teeth, or 1 inch.
If that's correct, then the rest of your worries magically vanish :)

- Steve