Re: Accuracy of i and j for arc centre

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "sid8ball" <sid8ball@h...>
wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Ray Henry <rehenry@u...>
> wrote:
> >
> > > From: "sid8ball" <sid8ball@h...>
> > > Subject: Accuracy of i and j for arc centre
> > >
> > >
> > > Can anybody tell me how accurate i and j have to be.
> > > In metric i am rounding down to 3 decimal places and in

imperial

> im
> > > rounding down to 4 decimal places.This could lead to a 0.001
> error
> > > in metric and a 0.0001 error in imerial. would this be a

problem?

> > >
> > > I dont want to use r instead of i and j
> >
> > Hi Sid
> >
> > With the EMC, you can adjust this to suit yourself and

recompile.

> We look
> > at arc endpoint to compute whether the arc center is correct.

Six

> places
> > was the default in inch but I think that four or even three is
> closer to
> > the default now.
> >
> > Ray
>
> ray,
>
> From what you have said i can asume theres is no + or - tollerance
> it is either right or wrong to 3 significante figures. I think the
> best way is to round to 6 figures in the equation untill the final
> answer and round that to 3 or 4 figures.
>
> cheers
>
> Sid

There is a parameter in the control that will let you adjust how
close you want it to hold you too.
cogsman1