Ignoramus30064 wrote:

On 2010-07-09, Karl Townsend wrote:

"Ignoramus30064" wrote in message
...
On 2010-07-09, Karl Townsend wrote:

I could never get it to run at super slow speed in voltage mode, but
could easily do so in tach mode. It was kind of nice to see.

Disclaimer:My control uses a Galil dedicted real time controller so your
results may differ.

Torque mode is the preferred mode for most all applications, certainly
for
what you're doing. Precise smooth control is not an issue at all with
lathe
and mill applications.

Karl, could you explain to me, why do you think so? Wouldn't the
milling table move at very high rates of speed if it encountered no
resistance, in torque mode?

i

http://www.a-m-c.com/content/support/FAQ.html#setup03

read question 3



Karl, that does not really answer my question (about possible high
speed).

i

Axis speed is controlled by the CNC control giving the motion commands,
not by the servo drive. The CNC control doesn't say "move to position X"
and the drive goes full tilt to that position. The CNC control manages
the movement to move at the specified feed or rapid rate, i.e. G01 X10
F25 moves from the current X position to X10 at a 25 inch per minute
rate.