Hello,
I just wanted to share my progress with you guys here.Yesterday I finished most oft the CNC built and did a first quick test.Video to first motor test
It was and still will be a very interesting and fun project. My ultimate goal is to build a guitar with the help of the CNC.
To finish the build there are still a few more things to do:
Right now the machine is very loud. I think I will have to lube the lead screw a bit.
I have a few general questions you guys can maybe help me with.
a) Is it normal that the motors make a noise when the machine is not moving. CNC Motor Noise Idle
The motors didn't make any sound when they were not connected to the machine.
It also stops when I disable Step idle delay ($1=0). It seems like "locking" the motors produces this kind of sound.
After playing around with the screw on the drivers the sound changes. Seems like it's the motor current.
Should it be possible to eliminite the idle humming and still have the motors working?
EDIT: The sound is also becomes audible as soon as I lightly press the motor onto the cnc / floor /etc
a) Is there a reason why topsie used a printed t8 nut as the 2nd nut for each lead screw? I just used copper for both since I had enough available. t8 nut holder and nut
Regards
Salut,
L'écrou imprimé sert a réduire les jeux de fonctionnement et il les serre plus ou moins pour ne pas contraindre la vis et rattraper les jeux d'usure. (Ta machine fait un bruit aigu quand elle fonctionne, est ce du à ça?)
Mettre un deuxième écrous laiton sur ma machine bridait trop la vis, j'en ai installé un anti backslash à ressort.
Pour le bruit moteur(vibration) as tu bien réglé tes steppers avec la vis sur le dessus?
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I looked up how backlash works and it makes a lot of sense now. @Yzago thanks for the info
The plastic ones I printed did not work at all so i loosened the second brass nut a bit more until the lead screw was able to move more easily.
I played around with the screw on top of the drivers a bit. I got it dialed in a lot better and it is quieter now but was not able to eliminate the noise entirely.
Could this potentialy be harmful to my nema17 motors? Would it be an idea to include motor dampeners?
Lubricating the mechanical parts helped a lot also and the machine is a lot less loud now.
Video after lubricating and dialing in a bit better
My CNC was noisy to, but if your motor dont heat up to much, it's not a problem
Le réglage du potentiomètre ne se fait pas à l'oreille normalement, il y a un petit calcul a faire.
On trouve plein de tuto et de vidéo sur le net en fonction des steppers utilisé.
J'ai regardé ta vidéo et le bruit est nettement plus agréable et normale.
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@topsi If you say it is okay for the motors to be audible when not moving with the locking enabled ($1) then I will stop trying to eliminate the noise
@yzago Thanks again for your help
I looked up how to correctly set up the motor drivers. I am using the DRV8825 stepper drivers.
I use the following motors 17HS19-2004S1 from Stepperonline. Datasheet
The motor is rated for 2 Amps. According to some forums in the internet it is not recommended to have more than 1.5 Amps on the DRV8825 per phase. I set the Vref of the stepper drivers to 0.7-0.74. The motors are definitely still audible.
You loose holding torque by only using 1.5Amps <- This entry states that I loose holding torque by not fully using the 2 Amps.
Should it be save to pump the Vref to may be 0.9-0.95 with a bigger heatsink and the addition of the 40x40 fan?
Bonjour,
Le DRV8825 intègre un limiteur de courant actif et réglable. Vous disposez également d'une protection contre les surcourant, la surchauffe avec 6 résolutions de micro-stepping (jusqu'au 1/32 de pas). Il fonctionne entre 8.2 et 45 V et sait délivrer approximativement 1.5 A par phase sans refroidissement (par refroidisseur ou air forcé - conçu pour 2.2A par bobine en utilisant un système de refroidissement efficace/adéquat). wikipedia datasheet
