cnc help

[gearcut]

hi i have a home built cnc machine
i am using desknc for dos
when i setup my machine i can jog each axis
and it works fine . i then load the sample file that comes with desknc
when i press alt g it screems through the code and my motors jitter
back and fourth?
what am i doing wrong?
is there a config file or a value in the code i need to change?

[ger21]

Have you tried using the "slower" button?

You probably need to add an F value at the start of the gcode, someting like F10, for 10 inches per minute