Re: [CAD_CAM_EDM_DRO] Torque Units-WAS Re: What makes a motor a s ervo? calculating power

LOL...I don't think you'll get him to budge. We had this very same debate a year ago. The important thing is that one realizes what oz-in represents. Imagine a 2 inch diameter wheel having a radius of 1" and 1 ounce of weight suspended from the circumference on a horizontal plane from the axis. That is 1 oz-in of rotational torque. Suspend 2 ounces of weight and that is 2 oz-in etc. For those who don't know.

Without risking the wrath of Andy, I'll forgo saying something sensible like "As long as we understand what it means" :-). All servo manufacturers that I've seen do display it as lb-in with a dash. It's not an equation rather a specification of torque.
Ron

m0nkey0ne <m0nkey0ne@...> wrote:
Andy,
Not sure what picayune is, hope you can find a doctor ....
If they are multiplied wouldn't that be OZxIn or INxOZ or OX*IN or
IN*OZ? You actually are writing OZ minus IN. (OZ-IN) I read all
these posts because I dont know much, however I did know exactly what
they mean by OZ/IN. If you had a 400 oz/in situation and wanted to
determine what that is per 2 inches, you would in fact divide by 2.
400 oz at 1 inch is equivilent to 200 oz at 2 inches.

Back atcha
Randy


--- In CAD_CAM_EDM_DRO@yahoogroups.com, Andy Wander
wrote:

> At the risk of being labeled as "picayune", I will repeat:
>
> It is NOT oz/in, it is OZ-IN or IN-OZ>
>
> They are MULTIPLIED, not DIVIDED!
>
> Had to get that off of my chest........
>
> Andy Wander
> Verrex Corporation
>
> -----Original Message-----
> From: Alan Marconett [mailto:KM6VV@a...]
> Sent: Wednesday, May 11, 2005 2:48 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] Re: What makes a motor a servo?
> calculating power
>
> Thanks Mariss,
>
> I didn't find it, but the stepper is probably 550 oz/in?
>
> Interesting, but not surprising that a servo is about 2X more

powerful for

> its size/weight. I'd noticed that steppers seem to be bigger for

the same

> power (building robots). More wattage in a smaller/lighter package
> because...?
>
> If I take half of 170 oz/in for the servo, then about 85 oz/in servo
> (possibly less) would be similar to a 550 oz/in stepper in machines

they

> could drive (gearing needed for servo).
>
> Can I assume that the "300 Watts" printed on my servos is

continuous? I

> don't have them in front of me, and I didn't find them on a Google

search.

> Target machine is an RF-31 mill. The 1000 (or was it 2000) line

encoders on

> them are over kill, I'll have to reduce that. Or does one of your

new servo

> drivers do that for me?
>
> Thanks for the comparison.

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