Hi,
Finally after two months of trying and frying a BOB I got my motors running but they're slow and gets heated.
I use stepper motors that I bought from Probotix and here's the link for it's specs
280 OzIn 8-Wire Stepper Motor -

My drivers are wantai DQ542MA
Stepper Motor Driver DQ542MA:Stepper Motor Driver DQ542MA wholesaler

the winding between motors and drivers are as follows:
RED+BLUE ==> A+
YELLOW+BLACK ==> A-
WHITE+BROWN ==> B+
GREEN+ORANGE ==> B-

I asked Probotix support and they told me that It's better to connect them this way..... but I really doubt the connection.

And for the driver DIP switch I don't really know what to select so I left them all at OFFs which gives 25000 pulse/rev with PEAK output current 4.2A
I tried playing with motor tuning in MACH3 but that doesn't help.

Please help me run these motors faster.
Thanks