Re: Servos drivers

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Andy Wander <awander@v...>
wrote:

> John:
>
> Some controllers, such as Mach2, will let you "slave" 2 axes

together. In

> this way, you use 2 motors, 2 Geckos, and 2 encoders, but the

software knows

> to move both at the same time, for the same distance.
> This will allow a separate home for each, so that if they get

skewed, it is

> relatively simple to fix it using the software.
>
> The A and B outputs are mainly there, as I understand it, so that

you know

> not only how many counts the axis moves, but in which direction. The
> "quadrature" part means that the A and B counts are 90 degrees out

of phase

> with each other.
>
> Andy Wander
> Verrex Corporation
>
>
>

Good post Andy. The only thing I can add to that is to explain that
the encoder signals have two distinct transitions for each line this
the 4 counts from two sensors. You get 4 times the resolution and
direction information (which channel comes first).