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

Randy:

While my terminology may be suspect, in fact torque IS force multiplied by
moment arm(radius), NOT divided.

You are correct that the proper way to write it would probably be oz*in or
oz x in, but I have seen it written(in books) many times as oz-in(oz "dash"
in; not oz "minus" in).

The important part of my (poorly-represented, perhaps) post is that there is
no division of the ounces by the inches.

We are saying the same thing; see your example below-the reason that
400ounces at 1 inch is equal to 200 ounces at 2 inches is BECAUSE you
multiply the ounces by the inches to get either 400 x 1 or 200 x 2, both of
which come to 400 "ounces x inches".

Usually written oz-in; I don't know why.

Again, per your example, you divide by 2 to get force at a radius, due to
(or causing) a torque, because you are dividing the torque, (400 oz x in),
by 2 in, so you get (400 oz x in)/2 in. the "in"'s cancel out, and you are
left with (400 oz)/2 which equally 200 oz.

Andy Wander
Verrex Corporation

-----Original Message-----
From: m0nkey0ne [mailto:m0nkey0ne@...]
Sent: Thursday, May 12, 2005 12:22 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Torque Units-WAS Re: What makes a motor a
s ervo? calculating power

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 <awander@v...>
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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