by the way, instead of using the L293D hbridge i used the SN754410NE with the same result… it seems like it´s common to find the L293B, so i don´t wanted to use it because it does not have the protecction diodes inside as the L293D or the one i am using.
My step motors are from Sparkfun.com and manage 2.6 kg/cm… 12 volts, 1.8 degree/step, 200 step/turn, 4800 step/inch on my array. they give me pretty good performance.
Made lots of tests on my machine for calibration and it draws a 1 inch sqare flawlessly, also made some circles and polygons to make the cnc work and produce the same thing i design on my computer…