I just completed building a gantry router with two lead screws and steppers on the X axis.   I set up the A as a slave to X and am having poblems with the motors not actiong in sync.

Any insight as to what I am doing wrong?

Jack

Are all the motor tuning settings exactly the same?

Gerry,

Thanks for your reply! 

Some details first. 

Router built from 1/2 and 3/4" aluminum tooling plate.  42" X 16" X 6" work envelope. Linear ball bearings and Thompson ball screws/nuts on all axis.  Motion seems to be very smooth and easy when moved by hand.   

The steppers are 269oz from Xylotex.  The controller is a 4 axis unit from Mechatronics.  24 volt power supply. Limit switchs installed.  I am using a digital multimeter.  VREF is adjusted to 4VDC.(Max reccomended vref is 5VDC).   PFD voltage is adjusted to reccomended 2.5VDC.

Running Mach 3. With motor tuning set at 7878 steps per , 79.98 velocity , 20.182788 accelleration.

Y and Z axis perform very smoothly.    X axis has A motor slaved to X.  X axis motors seem to stall or don't move at all making high pitched buzzing noise.  When X does move it seems to move slowly.

I don't understand what the PFD does and wonder if it needs adjustment???

Thanks,

Jack