Re: error in DOS not in cncpro

Carl,

Something seems really amiss with this one. Is the
0.5 inch move a one time error, or is the 0.5 inch
a cummulative error?

If a one time movement, not sure on what would cause
that except a programming error.

If a series of small errors, then check the following:

I suspect either a bad cable or connection. Admitted
the DOS machine might also be at fault, as might the
stepper driver. First check the cable, especially at
the ends of the cable.

Next, check the drivers to insure they are not getting
too hot during operation. If the Z-stage works fine on
smaller runs (shorter operating time), but seems to allow
errors after a longer operation, the drive maybe heat
sensitive.

A simple hardware checker called "Check It" can be used
to test the machine and to insure the parallel port is
fully functional. Look at http://www.smithmicro.com
and search for Utilities or CheckIt to find the hardware
test suite. [I think I bought the tools at CompUSA...
been a while, so not sure]

Tom Walter
Round Rock, TX.

--- In CAD_CAM_EDM_DRO@y..., "carlcnc" <carlcnc@y...> 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! My router has been rock solid
> reliable.
> If anyone has a machine that with travels of X24,Y16 Z4 or larger
and
> is using CncPro I would like to email this Gcode file to see if you
> get the same error. File is approx 5000 lines.
> email me offlist
> Carl