Re: g18

[Dam <damg-at-1st.net>]

Hi Dave,
Since I don't have a working machine yet I tried your code in sim mode.  What
you may be seeing is that an M2 at the end of the program resets the control
back to G17. The code snippit you posted doesn't have a G18 at the beginning.
With G18 active G3 is a counterclockwise arc as viewed from the positive side,
viewed from the negative side it is clockwise. A program end appears to reset to
G17 and your snippit entered as posted will cut a counterclockwise arc in the xy
plane. If you enter G18 in MDI it should work same as the program does in AUTO.
Dale

Dave Engvall wrote:

> List,
>
> I am working in xz plane with g18.
>
> Snippet:
>     g01 z .1 f 15
>     x 0
>     z -.184
>     y .1908
>     g03 x 2.249 z - 1.3584  r 2.55 f5
>     g01 z .1 f 15
> ...........
>     m2
> This snippet occurs several times with various y offsets to create a
> surface.
>
> If one thinks about a disk lying in the xz plane then this creates a surface
> from the top center of the disk and going to the right and down (top surface
> or radii of the disk, i.e. CW ).
>
> Now at the end of the program...either do m0 and shift to mdi or m2 and go
> to mdi.
> Enter the same snippet line by line. The g03 now does a COUNTERCLOCKWISE
> cut. Surprise!!!
>
> Certainly glad I was testing this in pink foam not steel.
>
> BTW- this is repeatable at least on my machine...600 MHz P3, 2.0.36, 09J.
> Mar 2000 emc.
>
> I would appreciate someone else trying this.
>
> Thanks,
>
> Dave Engvall