Re: Adding inertia to an axis

Peter,

Do not add inertia! Step motors already have a miserable torque to
inertia ratio, adding more will simply degrade your aceleration and
perhaps make the motor unable to move at low speeds without error if
it is being driven with a full or half step drive.

It serves no purpose.

Mariss

--- In CAD_CAM_EDM_DRO@y..., Peter <prenolds@s...> wrote:
> In the recent thread about X-Axis won't do as it's told - there was
a
> suggestion from Hoyt to try adding inertia to the axis. As it
turned
> out that wasn't the problem in Richard's case - but it may be the
> problem for one of my machine axes. But I'm curious as to how much
> extra inertia to try adding... I'd like to start in the right
ballpark.
>
> I have a NEMA42 motor so I will probably try turning a solid steel
disc
> around 3" dia and say 1" long as a starting point, recognizing that
the
> disc's OD is most significant in moment of inertia calculations.
Would
> appreciate any suggestions other than my wild guess as a starting
point.
>
> Cheers, Peter