Re[3]: axis naming conventions

Terry wrote:

>show me the standard. where may i download/view
>this standard? as others pointed out concerning
>a g-code standard that the "rs" in rs274 means
>'recommended standard', "recommended" being the key
>word.

See my previous post re: axis names. When I get back to "home base",
I'll find it and post the title. It's an old document, Air force
origins, if I remember right. But you dont need to wait... Just look
at some CNC texts! There ARE hard parts of CNC. This is not one of
them, IMO.

Recommended, yes. And CONFIRMED and ADOPTED in Nov.,1981, as
the "defining" standard for a word-address format to control
automated machine tools. Like all good standards, it allows for the
development of new implementations, but tries to "tie down" as much
as possible, given this need to allow for development.

What if this were an ansi C programming list, and someone suggested
that we switch the meaning of "=" with "==" ?!! The ANSI C standard.
That's a "recommendation" also. ALL standards start as "recommended"!

>most 2d cad programs all agree that the origin
>is the upper-left-corner of the screen. x-axis
>is left to right positive being to the right.
>y-axis is up and down, positive being down.

Don't know where this is coming from!? Most all use lower left or
center of the screen as origin, with positive to the right and up.
This means (using LL) we are working in Quadrant I of the cartesian
plane. (and keeps all coordinates positive)

The ONLY place I've seen what you describe is computer graphics
PROGRAMMING, and even there the languages provide a "translator"
instruction so we can work with the screen in the "real world" way we
are used to...

>most 3d cad programs assume the origin is the lower left of the
>screen.

Hope this helps.

Ballendo