Re: [CAD_CAM_EDM_DRO] Re: How can you test a stepper ?

In a message dated 2/21/2003 8:04:24 PM Central Standard Time,
hllrsr@... writes:

> Tried this trick today, (O.K. I was bored..) and couldn't get it to work.
> What's the trick?

Iain: I did this ONLY with a couple of Size-23, single-stack motors I have
"loose", and it doesn't work "well". Works better if the shafts are
"pointing upward". Less radial friction? Also, if you spin one motor with
the fingers rather abruptly. Slow-turning, and it won't do much. Do NOT
expect "synchronous" operation! I suspect some multi-stack and/or Size-34
and larger motors might work better for this, as ONE has to "generate" pulses
adequate to jog the other motor, and that might not work very well on the
smaller motors. No, I have NO interest in doing further research on this!
Have fun!

Best test is to MEASURE the resistances, to see if the windings are within
10% of "published values", and that there is "infinite" resistance between
the windings, and between them and the case, etc.!

Lotsa luck! Jan Rowland


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