Re: [CAD_CAM_EDM_DRO] Losing steps

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, January 28, 2005 11:25 PM
Subject: Re: [CAD_CAM_EDM_DRO] Losing steps


>
> Scott L Golden wrote:
>
> >Hello all
> >
> >In my day job (and I will follow the same in my home shop) I use a DRO
setup
> >to show all my movements for XYZ or in my case AYZ.
> >
> >This way if my machine missed steps (and it has and does but not as often
> >since I slowed down some of the defaults) the position is not the same on
> >the DRO screen as it is on my software screen.
> >
> >This is a great double check for me.
> >
> >Now if it misses the steps say z axis down by .002" and then .002" on the
> >way out.... you will never know. That sucks. Then you measure what you
did
> >and toss it out.
> >
> >But the DRO is the only positive double check you got. Ya, expensive
> >but......
> >
> >
> Of course a true servo system would detect this automatically, as it
checks
> actual vs. commanded position, say, 1000 times a second, and will go to
> e-stop
> immediately if it detects a following error greater than the value you
have
> allowed. I get this occasionally when I don't properly allow clearance
for
> clamps, etc. and the machine can't move to the commanded position.
>
> Jon
>
>
>
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