Bass,
From the
http://www.epanorama.net/circuits/diskstepper.html page, Search for 'PC parallel port to stepper-motor interface' and the diagram is just below the text. And don't forget to connect the floppy to a power cable from a PC power supply.
Do a process of elimination, try another floppy (even one with the small steppers), and another computer (preferrably NOT a laptop). The computer would be my first suspect component. Not all parallel outputs are the same level. I believe that was what was causing me problems at first.
Until you get past this stage, don't even bother trying to disassemble the floppy, just work to get one that will work first.
Lastly, consider writing some quick code in QBasic to drive the printer port rather than trying TurboCNC or Mach software. Work to simplify the setup. Hope this helps.
Rance