Hi,
I use CSS with Mach3 Lathe all the time.
I run a Smoothstepper currently with V015meg Plugin and Mach V3.042.037. (I notice this morning that Mach3 R3.042.038 is released)
I tried later Smoothstepper Plugins but the all have a problem with indicating True Spindle Speed on the Mach3 DRO. V015meg Plugin indicates accurate Spindle Speed.
As far as I can recall, CSS worked on my setup with all Mach3 variants that I have used.
I use Mach3s PWM output control to control my Danfoss VFD via a simple RC integration circuit. Works a treat.
Here it is working. In the Video I use CSS for the OD turning operation, then switch CSS off to perform the spot drill and drill operations, then switch CSS back on to perform the parting operation.
http://www.youtube.com/watch?v=55SLUjDg5goRegards
Chrisjh