Re: [CAD_CAM_EDM_DRO] Re: Climb Milling

Hi Buck,

I haven't tried any backlash comp for my old Sears/Sherline mill. I'm
running MaxNC -PRO, and I think it has a parameter for backlash comp.
Can you describe it a little further, and how best to measure it? I
recently acquired an old "last word" DTI, so I'm thinking I can use
that. Is it just used every time when a motor reverses? Seems like it
would have to be applied when cutting circles (which would be a hassle),
as the motors reverse for each quadrant!

Alan KM6VV (going in circles)


yahoo@... wrote:

>
> You don't implement backlash compensation by "backing the motor".
> Backlash compensation works because each time that the direction is
> reversed, the software realizes that turns-of-the-motor will not be
> reflected in the displacement. Therefore the software runs the motor
> a compensated amount more than would otherwise be required.
>
> This will not effect the milling direction or interfere with climb
> milling.
>
> Buck
>
> --- In CAD_CAM_EDM_DRO@y..., ron ginger <ronginger@r...> wrote:
> > After all the good explanations and horror stories of the results of
> > climb miling and backlash lets hear from the guys that think
> software
> > compensation for backlash is a good, or even useable thing!
> >
> > Sure, the program can cause the motor to backup to the right
> > mathematical spot, but while its doing that compensation the table
> is
> > quite free to get grabbed by the tool.
> >
> > A great bit of proof why Ive always maintained software compensaton
> for
> > backlash is bogus.
> >
> > ron ginger