Turning Tips
The Nova DVR XP drive technology is not just a variable speed motor -its smart motor technology takes
turning to a new level. The speed, vibration, and load sensing, work with the conditions and turning. The
machine will reward skilled turning with exceptional finish conditions. There is often no need for sanding.
As you apply load (chisel pressure or depth of cut) the control will sense the change in spindle conditions
and compensate accordingly. Get a feel of the communication between yourself and the motor turning
by applying increasing force. The motor will respond by applying increased power to exactly maintain
speed.
LOW SPEEDS 100-350: Select Hard Mode (see Special and Parameter settings)
Note – at low speeds 100- 350 rpm control of the chisel is important. At 250 rpm the motor still has good
torque (in fact the torque is more or less the same as at 400 or 1000 – but at low speeds there is a
difference , the DVR is a unique type of motor in that the control only supplies enough power to maintain
the spindle at the commanded speed. It needs to sense the load from the chisel and then it will apply
power as needed. At very low speeds the chisel can move fast compared with the rotation of the wood.
The important thing is to have good control of the chisel and maintain steady cuts (using the same
woodturning practices that produce quality cuts and finishes). In this way surprisingly heavy cuts can be
achieved. However, rapid or incautious use of the chisel will be immediately sensed by machine and
spindle will shut down and then automatically try a restart.
“Will The Machine Shut Down on Interrupted Cuts?” No, as long as the cut is within the normal range of
Woodturning cuts. An interrupted cut at slow rpm may cause a loss of control of the chisel and a dig in
may occur.
A way to understand chisel feed rates is to consider that at 100 rpm, the work piece has only rotated
about 1 and a half turns in one second and at 250 rpm, 4 turns. Considering that chisel feed or
movement under normal turning can be anything between say 5 and 100mm per second at normal
Woodturning turning speeds. At very low rpms it is easy to move the chisel too fast for good cutting
conditions. In general, low rpm is only used for special processes or conditions. Speeds below 350 are
generally not Woodturning speeds. The machine will operate down to 100 rpm but this is generally for
applying finishes and other applications.
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