We used Makeblock to make an x-y table. We needed this for an Arduino-driven microplate spectrophotometer, where the x-y table would move a microplate precisely in the x and y directions. The table is driven by two stepper motors. Unlike the Makeblock x-y plotter kit, this table uses a thread drive (Makebock thread drive kit), not a belt drive.
The link to the Instructable for the microplate spectrophotometer is here:
This shows the x-y table contruction, custom parts for mounting the steppers and the Arduino control.http://cdn.instructables.com/FWS/PCBV/I88LNVXB/FWSPCBVI88LNVXB.LARGE.jpg