Re: [CAD_CAM_EDM_DRO] Suggested velcotity params for servos?

Hi Abby,

I would keep the start frequency low. A sudden jump in frequency will
probably result in the servo overshooting as it tries to track the
acceleration. Turn the acceleration up until the drives start faulting
then back off to about 75% of that value. You will get a fair amount of
following error when accelerating to max speed but when you are doing
slow, accurate work the following error will be very small.

Les

AbbyKatt 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
>
>
>