Re: G-CODE TUTORIAL

--- In CAD_CAM_EDM_DRO@y..., "ballendo" <ballendo@y...> wrote:

> That's a good site, but be aware that it lacks many common codes.

Been looking at the G-code tutorial on G17, G18, G19

http://www.wokingham.demon.co.uk/prog/plane.htm

The tutorial says:
G17: XY plane - z is tool length axis
G18: XZ plane - Y is tool lenght axis
G19: YZ plane - X is tool length axis

Y Z X
\ | /
\ | /
\|/

I thing G18 should properly be named ZX plane instead of XZ axis or
alternatively the tool length axis for G18 should be -Y instead of Y.

Reason: coord system should follow right-hand thumb rule.

Example:
curl fingers and point thumb to give a "thumbs up" sign

G17: when fingers curled in the direction of x to y, thumbs point in
positive z-direction (tool lengh axis)

G19: when fingers curled in the directio of y to z, thumbs point in
positive x-direction, (tool length axis)

But in the case of G18, if one is to curl the fingers in the
direction x to Z, the thumb will point in the negative y-axis which
should then be the tool-length axis. To maintain this convention, one
should then name G18 the ZX plane.

Then everything will flow consistently: XY plane, YZ plane and ZX
plane.

What does your by now famous book says, Ballendo?

Peter






It

> also uses a Bosch control for examples; and is written in UK

english.

>
> You may want to also have a look at the EMC handbook, at:
> http://www.linuxcnc.org
>
> It has a more modern, and complete set of gcode. IMO, what it calls
> G38.2 should properly be called G31. (But that is the nature of
> Gcode. There are many different dialects, and they do not always
> agree.)
>
> Hope this helps,
>
> Ballendo
>
>
>