Rusty
Have look at the pulse width requirements of your BOB and driver board. 
You can set it in the HAL file

Look here as well:
wiki.linuxcnc.org/cgi-bin/wiki.pl?Stepper_Drive_Timing
http://linuxcnc.org/docs/html/config/stepper.html
http://www.linuxcnc.org/docs/2.4/html/hal_parallel_port.html



On 2014-02-20 17:37, Rusty Russell wrote:
> I am rather new to this, and I don't know of anyone locally to help
> (Huntsville, AL area).  Using a  Sain Smart B.O.B and Driver boards.  All
> three axes work correctly when instructed to traverse in a negative
> direction, however, when instructed positive, only travel half the
> distance.  I have tried using MACH3 to see if the problem was LinuxCNC, but
> I haven't been able to get the trial copy I have to move anything yet.  I
> ordered a replacement B.O.B. and it should be here tomorrow, to see if this
> one is broken.  I know the driver boards work, as they came from another,
> smaller build, that B.O.B. has been lost, though.
>
> Thank you for any help,
> Rusty
>

-- 

Regards /Groete

Marius D. Liebenberg
+27 82 698 3251
+27 12 743 6064


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