Re: [Emc-users] Latest observations

[Markwayne <mar...@mi...>]

About the motor temperatures. Motors and transformers are rated for 
temperature rise above room temp. A look at a couple of motors I have 
here shows 65 deg C rise. So thats 65 + say 25 room and you have 90 deg 
C. If that was water it would be ready for your tea bag, never boil your 
tea water. So a good way to confirm your motor is ok and the current 
setting is right is to measure its temperature rise with both coils on 
with a known amount of amps flowing.

I had a C shape burned into my arm for days after laying it down on a 
little 23 size motor I had sitting on the bench hooked to a bench PS.

Mark

Weyland wrote:

> Okay, I finally got a chance to get back to the shop.
> 
> I wired in the new Variac.
> I have a solid 68VDC at all times.
> 
> Motors burnt the sh|t outta me again, so I'm thinking that Ray's 
> pegged this one as being one of older steppers just getting hot.
> (these are stamped 1982)
> 
> I've still got problems with the motors though.
> 
> Unless I set the axis speed (jog speed) to something very slow, and the feed 
> override to be some combination of override and defined value, I get problems 
> with movement.
> 
> Now. I have noticed some differences today.
> 
> I've dropped the cycle time down to .000100.
> I can finally get some smooth movement, but I still can't get fast movement.
> The fastest I can get without problem is 15IPM.
> 
>  Now, I'd sped the axis' up, and get *better* movement, but what's happening 
> is that the motor will start to spin up, accelerate - gaining speed, spin for 
> a short distance, and then stall. (or do what appears to be stalling)
> Maybe this is called losing steps.
> 
> When it starts off, you can discern the "winding up" 
> sound of a motor... well... winding up.
> Then it will spin and travel for a short time, and then it will stall, but the 
> winding up sound continues up in frequency to a much higher pitch.
> When I stop trying to jog, you'll hear the sound start decreasing in pitch, as 
> if to be winding down, until just before it stops, the motor will start 
> moving again, and then stop when the sound stops.
> 
> Does this give off any clues?
> 
> I tried to use Mach1, but couldn't get it out of E-Stop, so gave up.
> I didn't have my BDI-Live CD with me so couldn't try it for comparison.
> 
> Weyland
> 
> 
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