Re: [CAD_CAM_EDM_DRO] What is wanted in a controller,

Hi Jon,

You can interrupt a program, and back it up? The mill actually runs the
Gcode backwards? Or do you just retract the cutter, and re-enter
(restart) the part program a few blocks back? Interesting. I'd like to
hear more about how it's implemented. I can switch between RUN, MDI and
Single Step, which I think works good, but I've wished I could "back up"
more then a few times!

Does the "backup" move the axis? Can I just "clear the part", and then
"backup" in the part program, allowing it to redo one or more blocks?
That I think could be done quite easily, as long as one were in ABSOLUTE
positioning mode, and clear of the part!

These are good ideas!

Alan KM6VV


Jon Elson wrote:

>
> ballendo wrote:
>
> > Alan,
> >
> > YES.
> >
> > Ballendo
> >
> > P.S. I've been tooting this horn since I joined this list. (and
> > trying to help those who had not seen/used a REAL control. And
> > pushing for "standard" gcode usage; in the same vein)
> >
> > --- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...> wrote:
> > > I've never seen a "Real CNC mill" (well, maybe just a little at a
> > > trade show), so TRUE, I don't know what it looks like and how it
> > > operates. But then, I haven't been trying to "duplicate" an old
> > > mill controller (perhaps we should??)!
> > ^^^^^^^^^^^^^^^^^^^^
>
> Yes, 9-to-5 professional machinists have some things on their controls
> that make their life easier. Mostly the ability to interrupt a CNC program
> and repeat a few blocks of code or even move the machine in manual to
> do a tool change, re-set the axis offsets and then continue the program
> without a bunch of hassle.
>
> I'm using EMC, which has a few problems in this regard. My old
> Allen-Bradley
> 7320 control was pretty primitive, but you could turn a handle to program
> search
> and punch the rev button, and it would back up one block of G-code for each
> push. Or select program slew and it would back up about 5-10 lines a second
>
> as long as you held the button. It was actually rolling paper tape through
> the
> reader (or thought it was, while a PC simulated paper tape for it) when you
> did
> this. EMC could do this with a little more trickiness in the user
> interface.
> Also, you could switch from manual to auto, change the axis offsets, etc.
> and then continue the program. This could also be finessed in the user
> interface.
>
> Jon