re:backlash comp was Re: Climb Milling (again)

Chris,

Exactly correct, in a perfect world...

In our imperfect reality, the cutter(along with the stiction,
friction,and momentum mentioned earlier) on some of our small(and
even some not so small) machines DOES move the table around. This is
why I have found a difference when the b/l comp is applied at the
mathematically correct point versus the point at which the axis first
changes direction AFTER the mathematically correct point.

Hope this helps.

Ballendo

--- In CAD_CAM_EDM_DRO@y..., Chris Stratton <stratton@m...> wrote:
> With regard to software backlash comp, if the value given to the
> software is correct and cutting forces are not moving the table
> around, then the move inserted by the software will not cause the
> table to move at all. Instead it will simply move the screw from
> contacting the nut on one side of the groove to contacting it on the
> other. Of course if the number you give it also includes something
> elastic like typical timing belt stretch, then all bets are off.
>
> Chris