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

Dan,
I'm not questioning your math, just curious how you came about the
multiplier 1.416 x 10^-5?

Andrey Lipavsky

Essex Jewelers
490 E. McMillan St.
Studio 205
Cincinnati, OH 45206
(513) 826-0240
www.essexjewelers.com

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Dan Mauch
Sent: Tuesday, May 08, 2007 4:08 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re:305oz Steppers! More torque, Scotty!!!!
(Shes' breaking up, I cannah hold'er)

Not sure what you are asking?
To convert g-cm^2 to oz-in-sec^2 you multiply
the g-cm^2 by 1.416X10^-5
thus 340g-cm^2X1.416X10^-5=.00481oz -in-sec^2
I sort of recognize the chart you had was from Mendonet but it doesn't list
what the inertia term is based on i.e. kilogram per forth night etc. and I
wouldn't trust that web site anyway.
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: Alan KM6VV
To: CAD_CAM_EDM_DRO@yahoogroups.com
Sent: Tuesday, May 08, 2007 10:46 AM
Subject: RE: [CAD_CAM_EDM_DRO] Re:305oz Steppers! More torque, Scotty!!!!
(Shes' breaking up, I cannah hold'er)


Hi Dan,

Just for fun, I looked up the steppers that I got from Sanyo-Denki

http://sanyo-denki-online.com/nema23.htm

232-180-DB 180 2 2.1 1.05 4.5 1.97 2.16 2.98
$102 $0.57

The rotor inertia is listed as 1.97 oz/in2 for this 180 oz-in stepper.

340 g-cm^2 = 1.86 oz-in^2 ??

That seems to be quite a bit different then the 0.00482 oz-in-sec2 for
your
units. What am I missing?

Alan KM6VV
P.S. Nice Steppers!

> 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





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