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

Andy,

You are technically right. That is not in dispute. I just saw an
opening to harass you a bit. You are preaching to the choir ....
Half a dozen guys here would know what it meant if it was written
insideout and backwards and all the rest of us that might think it
looks cosmetically prettier with a slash rather than a dash.

In any event, please don't stop posting here. You and several like
you have made this board a wealth of information. I could name
names, but sure as heck I would leave someone out.

Keep up the good work,
Randy


--- In CAD_CAM_EDM_DRO@yahoogroups.com, Andy Wander <awander@v...>
wrote:

> 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@y...]
> 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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