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Old 09-30-05, 08:02 PM   #1
phantomcow2
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I have not left my cave for days! Stepper motor help needed if possible

FOr several days I have been off the forum, in my cave (basement), toying with these stupid stepper motors!
I have finally gotten it so that these stepper motors turn! They really do!
But......they vibrate!
HOly crap do they vibrate, it scared my cat, it shakes the floor. Well perhaps the shaking floor is not quite the magnitude but still....

Does anybody know how to make these things vibrate less? And be overall smoother in operation? Currently I hve them in 1/4 microstepping mode.
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Old 09-30-05, 08:24 PM   #2
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lol, you're always asking super-specific questions about motors and tools, but they surprisingly get answered

good luck, BUMP to your thread
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Old 09-30-05, 08:34 PM   #3
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Quote:
Originally Posted by Ziggurat
lol, you're always asking super-specific questions about motors and tools, but they surprisingly get answered

good luck, BUMP to your thread
Thats right . THats why i always ask this forum questions. 30k members, somebodies gotta know something!
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Old 09-30-05, 08:37 PM   #4
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But if it makes you feel any better, i also post at cnczone the same stuff
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Old 09-30-05, 10:15 PM   #5
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Post a waveform of the control-signal you're using. What are you driving with the motors?
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Old 10-01-05, 06:38 AM   #6
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Waveform?
Well *eventually* i will be driving a milling machine with the stepper motors. Right now I am not driving anything, the motors are simply free. I want to get the motors turning before installing
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Old 10-01-05, 06:54 AM   #7
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Waveform... what does the ocilliscope trace of the electrical impulse being sent to the stepper motor look like?

Sine, sawtooth, etc.

And I'm not even knowlegable in this stuff
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Old 10-01-05, 08:37 AM   #8
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Just a guess, but I remember the one and only time I played with stepper motors (college senior project when we built a sensor driven microcontrolled controlled car), we had to put a capacitor between the positive and ground terminals on the motors to "clean up" the signal. What size cap? I honestly don't remember or even recall what precisely it was to calculate.

You may just want to experiment with capacitors between the motor terminals and see if it makes any difference.
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Old 10-01-05, 10:33 AM   #9
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Well the 4 axis board i bought, it turns out one of the axes are defective. Luckily i have a 4 axis, so i just assigned the X axis as another one on the board. And the defective one is unused, this works. BUt I wanted to put on a rotary axis, so either I get another 1 axis controller board of some type, or bug the guy again to help me out.
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Old 10-01-05, 06:21 PM   #10
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Quote:
Originally Posted by phantomcow2
Well the 4 axis board i bought, it turns out one of the axes are defective. Luckily i have a 4 axis, so i just assigned the X axis as another one on the board. And the defective one is unused, this works. BUt I wanted to put on a rotary axis, so either I get another 1 axis controller board of some type, or bug the guy again to help me out.
Ok, so you're going through the controller, not just feeding the motor straight 60 Hz AC, right? KingTermite might be right about the capacitor idea. The charging and discharging of the cap helps filter out low amplitude, high frequency interference.

From my limited experience with stepper motors, they generally have a distinct hum or even gentle vibrating (less than a cell phone vibrator), but if they're getting violent, something is up. I don't have any significant experience using steppers and none setting up a system, but based on what I know about the way they work, the only thing I can think of beyond what has already been said is perhaps you're feeding them a higher frequency signal than they're designed to handle.
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Old 10-01-05, 06:27 PM   #11
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WEll i foudn that the board was actually defective for the X axis, so I had to rename the A axis as X and all else works fine now. Switching to 1/8micro stepping solved my vibration problems, now they spin very well. Thanks all
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Old 10-01-05, 07:43 PM   #12
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Originally Posted by phantomcow2
But if it makes you feel any better, i also post at cnczone the same stuff
I'd be much happier if you were asking bike mechanics questions at cnczone, actually
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Old 10-01-05, 09:25 PM   #13
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I'd be much happier if you were asking bike mechanics questions at cnczone, actually
I dont htink they a foo like section though. Plus the folks here at BF seem to have a vast array of knowledge, as shown often in foo
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Old 10-02-05, 04:34 AM   #14
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Quote:
Originally Posted by phantomcow2
WEll i foudn that the board was actually defective for the X axis, so I had to rename the A axis as X and all else works fine now. Switching to 1/8micro stepping solved my vibration problems, now they spin very well. Thanks all
Quote:
Originally Posted by Ziggurat
lol, you're always asking super-specific questions about motors and tools, but they surprisingly get answered

good luck, BUMP to your thread
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