RE: [CAD_CAM_EDM_DRO] Frozen stepper motor shaft

Alan:

Yes, I have brought it up before. Some will say I am too picky(I guess
you are one of them) but it is NOT a division, it is a multiplication,
that becomes the "unit". If you look into WHY we use "ounce inches" or
similar terms for torque, you will quickly understand why(1 oz-in of
torque equates to a 1 ounce force at an inch from the center of
rotation, but to only 1/2 ounce of force at 2 inches from the center of
rotation-do the math-you MULTIPLY the ounce by the inches).

If you ever start trying to use these units in a mathematical
formula(which is not that far out a proposition, considering we are
attempting to design and build machines that use torque) you will get
hopelessly confused, as the units won't "cancel" properly.

The worst part is, that the folks who KNOW it is "ounce-inches", and not
"ounces per inch", and can shrug off the improper use, won't get caught,
because they KNOW how to use the formulas and calculations. But those
who DON'T know the proper terminology are the ones who most likely won't
be able to make sense out of it.

That's why I think it is important, and will keep bringing it up, as
long as I think it is important.

Back to the subject at hand, I think your advice to do an ohmmeter check
on the windings was good, as was that of the other poster who
recommended making sure none of the leads were touching when trying to
turn the motors. Until Mike gets back to us on what else he has tried, I
don't think we can go much further in solving his problem, unless it
would be to recommend that he checks the shafts where theey exit the
bearings and motor case for any evidence of corrosion. If they are
rusted or pitted to the point where that is what is causing sticking,
theen a good penetrating oil might do the truick.

Andy Wander
Verrex Corporation

P.S. By the way, I am sure that you know that just because a Google
search turns up a bunch of mistakes, that doesn't make them suddenly
become correct.

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Alan Marconett
Sent: Saturday, January 21, 2006 7:59 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Frozen stepper motor shaft

Andy,

Haven't you brought this up before? TOO picky! And I said oz/in!
Google searches for each way are about the same.

Let's see if we can figure out this guy's problem!

Alan KM6VV


Andy Wander wrote:

> "picayune mode on"
>
> It's oz-in, NOT oz/inch.
>
> "picayune mode off"
>
>
> Andy Wander
>
>
> Hi Mike,
>
> NEW-OLD STOCK? I'm guessing that there's nothing wrong with them.
> Just connect up an appropriate driver to them, and they'll work fine!

> 700 oz/in is BIG!
>
> You could make an ohm-meter check on the windings. We don't want to
> fry a driver, in case a winding is shorted.
>
> Alan KM6VV
>

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