acceleration profille

Hi,

Having some problem with the z-axis in the cnc'ed sherline with
Sherline stepper 1/2 winding, Camtronics 2A driver, desknc black box,
with the parameters set up as follows


Acceleration=5000
maxsps=15000
start_vel=5000
steps/mm=400

The z-axis seem to be loosing steps very badly. The z-axis seem to
jerk, and hardly move. I set the accel. to 500 and start vel. to 500
and problem persist. I think it may be the parameters may not be
suitable for this configuration.

Can someone suggest a suitable parameter for this set-up or let us
know about the parameters which is working with your system.

Thanks in advance

keongsan