I am in the process of resurrecting a KM3 and when I powered up the spindle it seems noisy. My first thought is motor bearings which I can replace easy enough. I have never been around a KM3 when running so I don't have any idea what noise level is common for the variable speed drive. I did tun the speed up and down and the noise remained the same. Score one for motor bearings but there is the speed change stuff in the mix also so I am unsure.
Have any of you been down this path?