Re: [CAD_CAM_EDM_DRO] Re: How bout this idea??

"Paul R. Hvidston" wrote:

> Having only a linear encoder on the table for feedback would lead to
> infinite loop gain during back-lash and like stated before, the result is
> oscillation/instability, position error and poor performance.

That statement is true, IF the backlash is a problem....
but IF the backlash is not a problem (ie has been sufficiently
nullified by various means), then I maintain linear encoders
on the table for feedback are are OPTIMAL.

Having the linear encoders on the table (directly measuring
the table's movement) is therefore the goal (ie not something
to avoid as might be read into your above statement).

Doug Fortune
http://www.cncKITS.com