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eurikain
28-03-2016, 08:03 PM
Hello,

I was trying to cut a dust shoe today. When the moves are slow on the Y axis, I get weird electronic sounds like these:

https://www.youtube.com/watch?v=Kh2AWswAMvw (https://www.youtube.com/watch?v=Kh2AWswAMvw)
or
https://www.youtube.com/watch?v=Z7KIcwAn0FU

It's the best example I could find, sorry if it is funny.

My settings in Mach3 for all axes are:
Velocity: 2500mm/min
Acceleration: 800mm/min

All axes are calibrated and work fine.

Thanks for your help !

All the best,
G.

magicniner
28-03-2016, 10:22 PM
Steppers sing to you when they are happy ;-)

eurikain
28-03-2016, 11:00 PM
Lovely said, but does that mean they're fine and I can live happily with that ? No harm no hurt ? :D

Clive S
28-03-2016, 11:33 PM
Lovely said, but does that mean they're fine and I can live happily with that ? No harm no hurt ? :DThey will be fine, but you can change the micro stepping along with the other settings to keep the scale right and probably get rid of the music.

eurikain
29-03-2016, 12:43 AM
I currently have all axes set to 1/8 micro stepping. I have AM882 drivers and Nema23 4.2A 3.2mh from CNC4YOU. In Mach3 I've got Velocity on 2500mm/min and acceleration set to 800mm/s/s on all axes.

It's weird because when the Z axis moves slowly (for example, approaching the surface for cutting), it doesn't make that sound. It seems like sometimes Mach3 is able to control the steppers at low speed without having them sing, while at other times they sing like a choir.

Reducing the MCS would lower accuracy right ?

JAZZCNC
29-03-2016, 02:50 AM
Still trying to workout if your taking the Piss or serious.?

If your serious then how the hell can we tell if the sound your hearing is normal or not if you don't let us hear it.?

Yes steppers do change pitch with different speeds but again to what degree depends on other factors like feeds n speeds and resonance of machine.

komatias
29-03-2016, 09:34 AM
As Dean says, the steppers will make noises at low rpm. I suspect due to your machines construction, it is acting like a sound box amplifying whatever the stepper noise is. If it is annoying, try a higher microstep.

eurikain
29-03-2016, 10:46 AM
Here is a video so you guys can hear it:
https://www.dropbox.com/sh/fl4e71rn5opqllg/AABlVQG3WVEjXiU_96NyYBXta?dl=0

johnsattuk
29-03-2016, 11:11 AM
http://www.andrewhazelden.com/blog/2011/08/creating-music-on-a-stepper-motor/

komatias
29-03-2016, 11:15 AM
.... I suspect due to your machines construction, it is acting like a sound box amplifying whatever the stepper noise is

That stands after watching your video. It is working like an acoustic guitar if you will. You motors do not sound too bad otherwise. The squeaking though? Lubrication needed on the rails?

eurikain
29-03-2016, 02:02 PM
Yes, i've got put some WD40 in there with a bit of grease :) The machine cuts quite well, I've made a temporary dust shoe out of ply wood that looks awesome. I've got a few problems but I will discuss this in another thread :) Just received my inductive home switches and my 3D printer will be delivered today so I can make their holders. I've got a lot of things to improve on the machine :)

That's right, the main gantry is constructed with a torsion box, so it's like an acoustic box as you say :)