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