adding inertia dampeners on nema34 motors

[cruz]

hi everyone,

i have a plasma table with nema34 motors on it.
these have at certain speed vibrations.
i would like to add some inertia dampener to help that.
here's where i got the idea from:


issue is that my stepper motors only have 1 shaft.
the back of the motor has a round detent of 30mm in diameter and about 3mm deep.
at the bottom of this detent there is a thin plate (i can see it move when i push on it).
here's a picture:

IMG_20190204_151832.jpg

does anybody know if it's possible to attach a dampener to this motor
this is what i wanna add to the motor:

Draft1.jpg

does anyone know what there is behind the thin plate?
could i attach the dampener to whatever there is?

on other forums i was told that there could be some preload spring there, and i was a bit risky.

anyone got a idea??

thank you

[john78]

Going to look like this. Better off getting new motors if that is what you want to do.

[tcaudle]

Never open up a stepper motor. Even if you know what you are doing it will almost always not go back together right. The alignment of the rotor has to be within a few thousands . Making that happen with a strong magnet trying to suck the rotor to one side or the other and getting both ends back in alignment is tedious and may render the motor worthless or dragging causing it to stick or "click" as it turns.

If your drivers had micro stepping, resonance tuning and step morphing to extend the upper torque range, it should work fine without dampers. Dampeners are only used on tables with older full or 1/2 step drivers .Might be cheaper to upgrade your drivers than buy all new motors so you can use dampeners.

[cruz]

okay, i think i'll drop the dampener idea...

the drivers have the option to change the pulse/rev from 400 to 50000.
but that doesn't seem to help much.
i can buy a set of closed loop motors with drivers for 195 euros (around 220 dollars).
i would need 3 sets then, 2 for the y-axis and 1 for the x-axis.
and then some wires and connections.

i think its time it spent the money on it, i'm just not sure i'll be able to connect everything...

[shaneb]

are these direct drive (sounds like it) if so , using reduction pulley should remove the vibration