Re: [CAD_CAM_EDM_DRO] emc g92

Alan Marconett wrote:

>
> Hi Tom,
>
> Are you running The Sherline version of EMC? I simply MUST have G92 for
> touching off in X and Y, and also the tool length in Z. I'm currently
> using my STEP4 controller, not EMC. I want to run Sherline's EMC, as
> soon as I get it's machine running again!
>
> I use G92 as Jon suggests to set X,Y and Z, but not IN the program, I do
> it manually with MDI. Does EMI tolerate this? I don't currently do
> tool changes in the program, I just make separate programs. I take it
> you're using G92 to set Z 0.005 or whatever after the M06? Humm, maybe
> I can incorporate something like that. Do you have a code snip?
>
> I was thinking of putting in a dialog box that would automatically set
> the 0.1" offsets for LL, UL, UR, LR for me.
>
> Alan KM6VV

Hello Alan,

I tried Sherline's EMC version and the regular version 2.18, both from
the Sherline BDI CDs.

I don't think it matters if G92 is MDI or within program. EMC just does
screwy things whenever you try to use G92. All of the offered solutions
form the EMC lists, none of which are acceptable to me, avoid the use of
G92 altogether.

I could not get anybody on the EMC developers list to fix this. They say
that it works as defined in the spec cuz the spec does not define it.
How's that for catch 22. Nevertheless, nobody on the EMC list has come
forward to say that they actually use G92 to do anything. So, if you ask
me, EMC's interpretation of G92 is somewhere between useless and
dangerous.

I did all of this in June so some of the details are muddy. Bottom line
is I cannot use EMC with my Sherline mill until G92, or some other
Gcode, sets the axis values with no screwy side effects.

Let me know if you have better luck with G92 and I will try again with
whatever version you are using.
Tom Hubin
thubin@...