Re[3]: axis naming conventions

Terry,

As you've already observed, 3D CAD/CAM programs put the origin in the
lower left corner. I wonder if your 2D's convention comes about from
the physical screen coordinates? Also, text mode line numbers follow
this convention. Cartesian coordinates for graphs have four quadrants,
so choosing the lower right hand one would give this convention also.

I like the origin in the lower left corner, with Y+ up, and X+ right, as
it matches my view of the mill table (cutter) motion as I stand in front
of it (hope I got that right!).

Alan KM6VV

PS, was going to give you the RS274D URL, but I must have left it in my
other computer!


"Terry L. Ridder" wrote:

>
> hello;
>
> show me the standard. where may i download/view
> this standard? has others pointed out concerning
> a g-code standard that the "rs" in rs274 means
> 'recommended standard', "recommened" being the key
> word.
>
> 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.
>
> if the 'virtual' paper is portrait the coordinate
> system would *_not_* match what you have been posting.
> i.e. the longest axis is y.
>
> if the 'virtual' paper is landscape the coordinate
> system would match what you have been posting.
> i.e. the longest axis is x.
>
> most 3d cad programs all agree that the origin is
> the lower-left-corner of the screen.
>
> On Wed, 22 Nov 2000, ballendo@... wrote:
>
> ballendo> Terry,
> ballendo>
> ballendo> Saying that some people do not adhere
> ballendo> to the standard is not the same thing
> ballendo> as saying the standard doesn't exist...
> ballendo>
>
> <major snip>
>
> ballendo>
> ballendo> Hope this helps.
> ballendo>
> ballendo> Ballendo
> ballendo>
>
> --
> Terry L. Ridder