Re: Linux vs. DOS

> From: "Tim Goldstein" <timg@...>
> Had a little bit of a chance to play with using I & J vs. R and at least

for

> the code my CAM program is generating R is the better way to go. Here is an
> example of the code that is causing errors for me:
> N14 G01 X0.155190 Y-2.331463
> N15 X5.844810 Y-2.331463
> N16 G03 X5.875000 Y-2.250000 I5.750000 J-2.250000
> N17 G01 X5.875000 Y-2.237713
>
> Line 16 is the one that is blowing up. The error message says
> "arc_data_ijk:error 116: radius to end of arc differs from radius to start
> of arc" If I plot this out using my new found understanding of I & J it
> appears to me to be the same radius. Any ideas?

I drew this in CAD and it's an 1/8" arc, but I think there must be some
teeny, tiny error at maybe the .0000000000000x level. I'll ask Fred how we
can verify code produced by CAM systems and what we need to do to reconcile
the difference between theory and reality. The up side of this is that these
errors are pretty rare (at least for me using the system I've got) although
they do crop up from time to time. What might be good is some sort of "arc
validator" program that would check G2 & G3 moves for correctness and allow
you to change the start, end, or center point to fix problems (probably the
center is the most useful).

Also in a previous post I said:

"Since switching to IJ format there haven't been any problems since for any
two points (start and end) and a specified center point, an arc of some
radius exists!"

Please ignore this obviously untrue (and stupid) statement on my behalf! I
think what I meant was that using the IJ format there is only one possible
arc between the start and end points, but the distances from the center of
the arc to the start and end points have to be equal!

Matt