Re: [CAD_CAM_EDM_DRO] Suggested velcotity params for servos?

Control softwares like Mach2 allow the user to adjust the acceleration and velocity. Acceleration is actually a "servo ramping" adjustment that prevents the servo from trying to take off at full speed. It feeds the pulses slowly and faster up exponentially until the motor reaches the RPM required. "Acceleration" adjusts the servo ramping and "Velocity" adjusts the top speed. One could use a 10 hp servo and the software will only allow it to perform what its configured for. Nice software.


Ron

AbbyKatt <cnc@...> wrote:

Can anyone recommend velocity params for servos? I've got the big-big
servo motors from Dan Mauch's site (I can't remember which ones they
were, but they cost $199/each) and I'm running these with geckos at 60v
in a 1/3 timing belt setup on my mill/drill. I'm running with TurboCNC

My max reliable (without faulting) speed is 35Khz
That's pretty easy to guage.. But I was wondering about the starting
frequency and acceleration?
I know steppers can have a high start frequency, since they effectively
"hop" to the first position with a high torque, but what about servos?

I'm really not sure here.. Any good way to derermine?
I'm worried that I'll be accelerating too fast, or starting too fast and
sacrificing accuracy as the servo lags behind just far enough not to
affect the signed 8-bit lock (128+- count) of the servo. But at the same
time, I don't want to enter 0 as the start rate if I can do better.

Any suggestions? Good ways to check (without a DSO?)
Thanks!
~Abby




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