Reyd Dorakeen wrote: whats the difference between the nova 3000, and the nova DVR? ^^^^^^^^^^^^^^^^ The main difference is in the drive. The 3000 uses a fairly conventional belt drive, with step-cone pulleys--the motor can be either a constant speed induction motor, or a variable speed motor.
On the DVR, the motor shaft IS the spindle--no belt drive at all. The motor is a radical design, using iron vanes in a rotating magnetic field. The field is produced by a set of stationary coils connected to a computer, which feeds pulses to the coils to produce the rotational speed and torque called for by the operator. The REALLY interesting thing about it is that the field rotates in a direction OPPOSITE to the rotation of the armature. I'm not going to try to explain that--you can see it on their website, though.
Owners report that the rotation is so smooth and vibration-free that they get extraordinarily smooth cuts.
I understand that the DVR has a much improved tailstock (over the 3000.)