Found this on another forum about Stepmaster NC

http://www.cnczone.com/forums/showthread.php?t=37937

Used the machine again after fitting a replacement spindle as the transformer supplied burnt out half way through a small drilling job, half way through the job the machine lost some steps and wound up drilling the other holes about 12mm out of place...

Not too impressed by the controller atall! certainly isn't worth putting any material underneath it, for fear of making scrap or damaging the machine.