EMC setup questions

Hi All,

Thanks for all the answers to my previous questions. I have now got my
system up and running with EMC.
I am still looking for the right settings to get my units correct:
Now EMC works in mm and shows mm on the screen, but my table moves
lots more than 1mm when commanded to move 1mm. This is when I have
input_scale=1000 and the emc-gui shows a feedrate of around 20-60
units?/s

I am using steppermod.o

I have linear_units =1

I have tried to calculate input_scale as follows:
my steppers are 200step/rev driven with halfs steps => 400steps/rev
my ballscrews give me 5mm movement for every rev.
=> input_scale should be 80 ??

when I set input_scale to 80 on one axis for testing it, it seems to
work when jogging in the + direction, but I immediately get a
following error when pressing the - button.
The FAQ tells me to reduce feedrate when this happens. I have
max_velocity set to 20 on all axes.
If I understand correctly the parallell port whould be able to do
around 5 kHz which would be equivalent to a feedrate of over 60mm/sec
on my system (5000steps/s / 400 steps/rev * 5 mm /rev > 60 mm/s)
even with a very low feredrate I get the following error when trying
to move in the - direction.

thanx for any help,

AW