EMC Help Required!

Dear Group,

I have managed to calibrate the stepper motors so that what is
displayed on screen reflects that of physical movement of the x,y and
Z axis, however the machine is running very slowly and when trying to
jog at speed the stepper motors make strange noises and seem to go no
where fast.

The setting for INPUT and OUTPUT SCALE = 685.71428571 0 (thisI
managed to workout by clocking the table and much trial and error.
When this was set at -16000.0 0 the machine would move fast and
smoothly when jogging etc etc.

Am I missing something?

Kind Regards
Steve.