Re: When to use What

Howdy!

What's nice about multiple work coordinates (G54-G59) is that you
don't have to have your multiple part fixture evenly spaced. You can
have a fixture that holds multiple parts and each part can be
separated by a different distance. The control will store each origin
for each part. You can then switch between origins at any time within
the program just by programming G54, G55....and so on.

With G92, you have to know the exact distance between origins because
you have to load that shift amount into your program when you call
it, ex. G92 X1.000Y-2.345. With cutting multiple parts with multiple
shifts, if you stop in the middle of the routine and want to start
over lets say on the 3rd part. Then you have to start over at the
beginning of your program and pick up all those previous shifts in
order to get back to your #3 part. With work coordinates, I call any
one coordinate and use it at any time. I have stored coordinates for
totally different parts and switch between working on them at
different times. This allows me to load the different part in my
vise, load the program for it that calls its coordinate system (G54,
G55 or what ever) and then go. I don't have to re-origin the machine
as long as my vise hasn't moved.

Work coordinates are easier to set. All I have to do is move the
machine to each origin location on my fixture or my part and hit
ENTER on the computer keyboard and the control stores that X, Y and Z
location in the selected coordinate system.

Happy toolpaths!

--- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:
> Carol & Jerry Jankura wrote:
>
> > Guys:
> >
> > When should you use the G54-g59.3 series of commands or the G92
command to
> > change the location of (0,0,0)?
>
> If you build a workholding fixture that holds several identical
parts at some
>
> fixed separation, you can use these offsets to select which part is
to be
> machined from the same program. If you have identical features
like slots
> or pockets that need intricate machining, you can create the CNC
program
> for one of these, and then offset with the G54, etc. to machine each
> repetition of the feature.
>
> Jon