4th axis as a "poor man's lathe"

[JAZZCNC]

Actually, the sound is normal. The noise comes from the timing belt, not the motor. It is not fair to compare your servo on a test bench with one attached to this spindle through a timing belt.

Chill your beans man, I was working on what you said "One thing I am disappointed is the noise. I find the servo is quite noisy." So I took it that most of that noise was from the motor and I was just showing how quiet a servo is compared to a stepper in case you didn't know.

Also, if you are saying most of that noise is from the belts then you need to look at the setup/pulleys/belts because they shouldn't make that much noise. I connect most of my motors to ball-screws with timing belts so have fit 1000's of belts and they make a fraction of the noise you have there.

BTW, what's an AC or DC servo? There is only one servo, but I think you call AC servo a servo which has a drive connected to AC current and DC servo one which has a driver connected to DC current. The only actual difference is that in one case you have the rectifier built into the driver and in the other case you have it built into the PSU. Mine is called AC servo with integrated driver, which requires 20-50VDC, but it is still an AC servo and not a stepper.

It's not that simple and the drives work differently regards the motor types, but in both cases, they are virtually silent compared to a stepper which was my point.
I didn't think for a minute or was saying they were steppers but the noise in the video certainly sounds like a badly resonating stepper.