Movement above 50 mm/s loud
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@dc42 said in Movement above 50 mm/s loud:
Actually it can still be resonance, because the elasticity of the magnetic field and the rotor inertia of the motor combined to give a resonance. If you can tell me the rotor inertia, rated current, holding torque, step angle and actual current for your motor then I can work it out.
It should be all in the datasheet:
https://www.omc-stepperonline.com/download/17HS19-2004S1.pdf
But I have to say, I used other motors before, where the printer was loud, too.
I have to check them running, without the belts, too.I changed the motors yesterday but the test without the belt I only did on the motors from stepper online.
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For a 200-step stepper motor with holding torque H, the spring constant (in Nm/radian) at full rated current is 25 * H/pi which for that motor is 25 * 0.59/pi = 4.7Nm/radian. The rotor inertia is 83 gcm^2 which is 83e-7 kgm^2. So the resonant frequency is f = (1/(2p)) * sqrt(k/I) = sqrt(4.7/83e-7)/(2pi) = 120Hz.
In practice it will be lower than this, because we rarely run the motors at peak rated current and because holding torque is normally specified with both phases energised rather than one. This means that the motor will be ;less stiff than 4.7Nm/radian. So I would expect the resonant frequency to be about 75-100Hz, if I have got the above calculations right
If the motor is well-made then the primary reason that the resonance will be excited should be be because not all microsteps are equal (how unequal they are depends on the design of the motor). So the worst speed will be when the frequency of full steps matches the resonant frequency. You haven't told us your steps/mm, but as an example if you have 80 steps/mm @ x16 microstepping, that's 5 full steps/mm, so a resonance at 80Hz would be excited at a movement speed of (80/5) = 18mm/sec.
OTOH if the main cause of the resonance is that the poles of the motor are inaccurate, or the stepper motor coils are not balanced, then the resonance will be excited by movements of four full steps, which would make the worst speed about 64mm/sec.
How noisy is the motor at 80 to 100 mm/sec speed?
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; Drives
M569 P0 S0 ; Drive 0 -> X goes backwards
M569 P1 S0 ; Drive 1 -> Y goes backwards
M569 P2 S1 ; Drive 2 -> Z goes backwards
M569 P3 S0 ; Drive 3 -> E0 goes forwards
M569 P4 S0 ; Drive 4 -> E1 goes forwards
M350 X256 Y256 Z256 E256 I0 S1 ; Configure microstepping with interpolation
M92 X1280 Y1280 Z25600 E13045 ; Set steps per mm
M566 X900 Y900 Z12 E600 ; Set maximum instantaneous speed changes (mm/min)
M203 X18000 Y18000 Z300 E6000 ; Set maximum speeds (mm/min)
M201 X3000 Y3000 Z250 E600 ; Set accelerations (mm/s^2)
M204 P500 T3000
M906 X600 Y600 Z600 E700 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S120 ; Set idle timeout -
https://www.youtube.com/watch?v=CdYzRrFHQts
https://www.youtube.com/watch?v=qP8tJOAL6FM
https://www.youtube.com/watch?v=UAPBxa4VE
https://www.youtube.com/watch?v=KLi-jRb4IOE
1000, 3000, 6000 and 12000 mm/s, I dunno the order ^^
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I can't really see from the video, but is that a corexy configuration? This would explain why only one motor moves for a 45 degree diagonal at least, but then both motors should move for straight X or Y movement.
It would certainly be worth checking that you are getting both sets of coils energized on your motors, and that your wire colours are consistent. Do you have a multimeter that can measure inductance?
Edit:
just saw, 1280 steps/mm? I suppose that you can do that with 256X microstepping, but is that actually called for? I'd be tempted to see if "The road greater travelled" IE: set microstepping to 16X (With 256X interpolation) and 80steps/mm was quieter.
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@supraguy I will try 16 Microsteps with Interpolation.
Why the color of the spools need to be consistent?
I thought it is just enough to have the right pairs, it isnt? -
@hevilp said in Movement above 50 mm/s loud:
I thought it is just enough to have the right pairs, it isnt?
Yes you just need the right pairs.
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Yes, you just need the right pairs, so I did mean to make sure that they're in the same order at both connectors.
Your motors have 6 wire connectors, and you should have wires at pins 1, 3, 4, and 6. They should go to the 4 wire motor connector on the Duet in the same order.
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@supraguy said in Movement above 50 mm/s loud:
Your motors have 6 wire connectors, and you should have wires at pins 1, 3, 4, and 6. They should go to the 4 wire motor connector on the Duet in the same order.
Unfortunately there are at least 2 different wiring schemes for motors with 6-pin JST connectors on them, so the above isn't necessarily correct.
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I'll keep that in mind. I have only encountered the 6 wire connectors that work as I described. Thanks!
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The other pinout I have come across is 1-4, 3-6. All 4 motors on my Ormerod use this pinout.
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I'm right, when I say, the motor is turning right, I connected all right?
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@hevilp said in Movement above 50 mm/s loud:
I'm right, when I say, the motor is turning right, I connected all right?
If you are able to move the motor in a controlled way in both directions, then you have connected it correctly.
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Okay,
its fine than. I think its nothing with the duet. Speeds above 50 mm/s does stutter, rattle, shaking on the X-axe - carriage and I'm not able to figure it out. It was with rods and now with linear rails, too.
On the video you cannot real hear how loud it is, anyway:
https://www.youtube.com/watch?v=id_A0d7HXlwJust not usable above 50 mm/s, I'm happy with any help here, the printer is jsut garbage with the sounds.
