Re: stepper motor inertia

Hi Elliot,

I think there is an error in your calc.

Your constant 12.2 should be Pi*density which is 24.50.

Regards
Phil

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "optics22000" <elliot@...>
wrote:

>
> the moment of inertia of a cylinder rotated around its axis is
> I= m r^2
> m= pi r^2 l density
> density steel is about 7.8 g cm^-2
> so I=12.2 r^4 l
>
> Conside a 1/2" diameter leadscrew 1' long,
> I=60 gm cm^2 ; this is much less than the rotor inertia
>
> regards-
> Elliot
>