Re: [CAD_CAM_EDM_DRO] error in DOS not in cncpro

carlcnc wrote:

> Anyone ever hear the term "number chain"? A machinist used this
> phrase when discussing a mysterious move I have in a Gcode file
> run with cncpro.
> Problem appeared in Z axis when I ran a file to engrave a sign on
> my router. As program is running I will get a -Z move of aprox. .5in.
> It is not in the gcode, extensive testing of drivers,mechanicals
> proved it is not lost steps,coupler slip etc.
> I created a few new files from similar but not same drawing and no
> error. Went back and ran original file at slower speed SAME error!
> I hooked up to a new PC,fresh load of cncpro ran file SAME error
> created yet more new files ,no error.
> My machinist friend then told me that DOS could be causing the
> problem due to a "number chain error".
> Honest,I am not making this up!

YOU'RE not making it up, but HE is. It is a meaningless statement.
I think he is trying to talk about cumulative roundoff error, but that is
not what is happening here. It is a plain motion planning bug in CNCPro
that your specific program has uncovered. DOS has NOTHING to do with it,
as DOS is almost completely out of the picture with this sort of software,
and
DOS doesn't handle the numerical computations. There is a possibility of
a bad memory location, so running one of the memory testing programs might
be a good idea, too.

Jon