What are you hoping to accomplish with your CNC machine? V-carve software is good for designing signage - is that what you had in mind? If the signs you plan to make are very small, the TinyG might be an appropriate controller for it, but it's underpowered for most stepper motors larger than NEMA 17. You'd still need a G-code interpreter like Mach3 or LinuxCNC that would take in the G-code from V-carve (or whatever CAM software you use) and feed it to the controller and drivers. Since the TinyG is limited to 2.5 amps and 30v input from the power supply (most sources suggest 24v), you'd need to find motors with extremely low inductance if you want any speed from them. Since torque is dependent on motor current, don't expect a lot of that either.