Welcome to the SeeMeCNC Community

Hi everyone.

I just finished assembling my Rostock and was wondering if the high pitch whine is normal?

Thanks.
Ben

Yes, what you are hearing is the motors becoming energized, as you'll notice the whine only starts after you home the machine after you turn on the machine.

One thing many of the users here in the forum do to reduce (and in fact almost entirely eliminate) the whine is to purchase Astrosyn Dampers and install them on the motors of each tower.

Several members here on the forums sell them, the most prominent (and one I bought mine from) is astroboy907.

The whine is from the stepper drivers running in the audio range, part of the design of the Rambo board. Different drive designs run at different frequencies, I always try for ultrasonic so it only annoys bats.

Edit: There's actually two sources of the whine, the constant current drive and the actual stepping. The stepping noise is much harder to get rid of other than a damping weight on the shaft and mounting the motor on a damper.

Or a bad power supply,,,,

My power supply whined more than my steppers ever did. When I replaced it, I briefly thought that my heated bed stopped working... because it didn't whine anymore when I activated it.

As we're talking PC power supplies, I'm not sure I've ever seen a good one.

I have experience with 2 V2s, mine and my robotics teams. The robotic teams printer is nearly fully stock, except the E3d V6. When I turn it on I can hear the wine of the RAMBo fan and a bit of noise from the PSU. When I turn on the bed the pitch of the RAMBo fan decreases significantly with the added draw and the PSU wines a bit more. With mine when I turn it on (nothing about it is stock except the end effector, carriage arm mounts, and the bearing covers and spacers) the PSU fan spins up (as well as the 2 5V fans for the controller, though they are silent) and thats all I hear. When I turn on the bed after using the team's printer I have the same problem, is the bed really running? When building mine I grabbed a random PSU, checked that it could deliver more than 15 amps (I think mine is rated to 16?) and put it in the machine. My R7 can get to 100 in around 7 minutes no sweat. I got pretty lucky, I don't even know where I got that PSU. Granted, it can't run 2 hotends, 2 5V fans, 1 water cooling pump, AND the Onyx at the same time (shuts off) but it runs everything else pretty well.

I just thought it was a little funny that some random PSU I picked up at my local makerspace works better than the Diablotek supplies that are rated for 600W.

I believe it is the stepper motor making the noise because when I first power it onthere isn't a high whine. But once I move the stepper motor the whining begins

Yep the extruder motor is highly annoying, I'm trying to think of the best way to dampen it, as it makes both a lot of noise vibrating on the top plate (which is worsened with the opening for the filament holder and echos), but also mounting it better on the Melamine - if you tighten it too much or too loose it vibrates on the Melamine and makes an awful noise.