[Emc-users] OT- Not quite your hobby sized mill

[Roland J. <rol...@gm...>]

On 29 February 2012 10:56, Dave <EM...@dc...> wrote:

> There is a lot of BS on that webpage.    Optical encoder accuracy..
> Impressive to those who don't know better I guess.
>
> This is really the only important fact regarding accuracy:
>  >>We use Leica laser trackers to measure the volumetric Cartesian
> errors. These devices have accuracies of approximately 0.002 inches (51
> microns) in our working envelope.
>
> Those are required to get any decent accuracy on a machine that large.
> That machine probably grows and shrinks a quarter of an inch or more
> with temperature swings.
>
> Dave
> >
>


What temperature swing?   0.2deg ?  Temp control is cheap.

Regards
Roland