RE: Why can't I re-run this program?

John, Tim, Jon

(comments mixed in)

----Original Message-----

> From: Tim Goldstein [mailto:timg@...]
> Sent: Monday, July 09, 2001 12:19 PM
> To: 'CAD_CAM_EDM_DRO@yahoogroups.com'
> Subject: RE: [CAD_CAM_EDM_DRO] Why can't I re-run this program?
>
>
> I never really got a good explanation of the various "M" codes,

Concerning program end codes, Tom Kraamer's interpreter page says,
"To end a program, program M2. To exchange pallet shuttles and then end a
program, program M30. Both of these commands have the following effects.

1. Axis offsets are set to zero (like G92.2) and origin offsets are set to the default (like G54).
2. Selected plane is set to CANON_PLANE_XY (like G17).
3. Distance mode is set to MODE_ABSOLUTE (like G90).
4. Feed rate mode is set to UNITS_PER_MINUTE (like G94).
5. Feed and speed overrides are set to ON (like M48).
6. Cutter compensation is turned off (like G40).
7. The spindle is stopped (like M5).
8. The current motion mode is set to G_1 (like G1).
9. Coolant is turned off (like M9).

No more lines of code in an RS274/NGC file will be executed after the M2
or M30 command is executed. Pressing cycle start will start the program
back at the beginning of the file."

> but I use an
> M2 at the end and the programs to rewind to the top after a couple of
> seconds and will rerun with just the press of the run button.
>
> Tim
> [Denver, CO]
>
> > -----Original Message-----
> >
> > I have the following short G-code program I would like to run in EMC
> > multiple times without reloading it.

<s> > g20

> > f 2
> > g01 x1.5
> > g01 y .5
> > g01 x0
> > g01 y0
> > m30

<s>>

I did a little editing on this g-code to simplify but do the same thing.
Since g1 is modal it only needs to be stated once. And several words can
be piled into the same line.

g20 g01 f2 x1.5
y .5
x0
y0
m2

I tried this code with both m2 and m30 and the result was the same here.
It would restart every time. (I remember some kind of a problem with program end
with some release a while back.)

The only difference between the revised program and the original is that
the interpreter does not have to read and set g01 each time. If this were
a large contouring file it would read ahead and work a little faster.

Ray