Re: [CAD_CAM_EDM_DRO] stepper - servo Holding tourque

Owen Lloyd wrote:

> If I need min 400 in/oz Nema34 stepper motors. Would that mean I also
>need 400 in/oz servo motors? Do they have the same torque rating system?
>I've searched the archives and can't seem to locate any reference to this.
>
>

No. Most people use inflated holding torque ratings so they can get
usable running torque at
medium speeds. On a servo, the running torque=holding torque up to
nearly the top speed,
at the voltage limit of the power supply. So, you can live with a servo
system with continuous
torque rating much lower than the stepper's holding torque. In the
above example, a servo
with 100 in/Oz of continuous torque would probably work fine. It would
likely have a peak
torque rating of 400 In/Oz for 1 second or so. Steppers have no feature
like a servo's peak
torque.

Jon