Re: [CAD_CAM_EDM_DRO] Re:305oz Steppers! More torque, Scotty!!!! (Shes' breaking up, I cannah hold'er)

The MCG IH23014 252 oz in stepper motors that I sell and that Mariss loves and uses for many of his tests ( shameless plug) has a rotor inertial of 340 g-cm2 or 0.00482 oz-in-sec2
but many of the MS motors in the 280 oz in torque range have an inertia of 480 g-cm2.
Hope that helps.
Dan Mauch
economical 3D scanner software and kits
low cost stepper and servo motors.
cases for Gecko drives
kits and assembled 3-4 axis drives
www.camtronics-cnc.com
www.seanet.com/~dmauch

----- Original Message -----
From: optics22000
To: CAD_CAM_EDM_DRO@yahoogroups.com
Sent: Tuesday, May 08, 2007 7:52 AM
Subject: [CAD_CAM_EDM_DRO] Re:305oz Steppers! More torque, Scotty!!!! (Shes' breaking up, I cannah hold'er)


I volunteer to calculate moment of intertia for drive screws, does
anyone know the moment of intertia of the stepper rotor?
Even a roughly dimensioned sketch of the rotor could be used the
closely estimate its moment of intertia.
I'll come use with an equation for the screw moment of intertia with
two variables: diameter and length. It will then be possible to
compare motor to screw moment of intertia. If data can be collected
for a range of motors, we could put a database on the CCED site.

regards-
Elliot
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "David G.
LeVine" <dlevine@...> wrote:
>
> At 05:20 AM 5/7/2007, you wrote:
> >The ROTOR INSIDE the motor is ALSO longer. More mass. Put simply,
> >slower. (all else being equal. Which I've pointed out IS the likely
> >case where the power supply voltage is concerned due to limits of
> >the driver chip used.)
>
> Just as a point of interest, if the driven element (e.g. a ball
> screw) is much heavier than the rotor, the added inertia may not
matter.
>
>
> David G. LeVine
> Nashua, NH 03060
>





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