Re: [CAD_CAM_EDM_DRO] Stepper NG??

Hi Jon,

8 wires (assuming no tach or other funny stuff) should be good for
Bi-polar. What are the colors of the wires?

Yeah, I'd wonder about the meter. I have two Flukes, the old,old one, I
don't trust the AC voltage on any more. If you have another motor, read
it's windings, and draw them both out. You say 8 wires with two sets
soldered together? That *sounds* like you're saying 4 wires over to the
other 4 wires. OK, they are probably putting the windings in PARALLEL.
Still don't want to see shorts!
What scale and what resistance? You might try reading some KNOWN
resistors, that might also give you a little more familiarity with the
meter. Mine says 0L, or something, but it's AUTO-RANGED up to the MEG
scale. So it just means open (Fluke 89A, I think).

Alan KM6VV

Jon Anderson wrote:

>
> Alan,
>
> Don't know what it is, I'd assumed bipolar. It's an 8 wire with two sets
> of wires soldered together, so I'm assuming it's series wired.
> Was trying to confirm that when I discovered that every wire seems to
> show continuity to every other wire and ground! I'm using a Fluke meter
> I bought on eBay, so I can't vouch that it's OK. In fact, either
> something really screwy is up with the motor or the meter is bad. I went
> back to get some readings to post, and I got totally different readings
> than the first time. With the scale set to 200k ohms, I see readings
> that wander significantly, like from 1600 to 1800. Be nice to have a
> manual so I'd know what I'm doing with the meter. Or a plain old needle
> type.
> Don't think I'm going to risk an expensive Compumotor driver on this
> sucker. I've got some light duty 34 frame motors I can use until I sort
> this motor out or replace it. I really wanted to use it though, it
> appears to be a double stack, and is fitted with a brake which would be
> nice. At a 4:1 ratio, the dividing head can be back-driven...
>
> Jon
>
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