Originally Posted by
jon_fallon
Here is what I would do on the 4020 or 6030 here if noise were present:
1. Remove the X-axis radial bearing (opposite end of motor) and see if the noise persists.
2. Home the machine (HO), mark the motor coupling/ball screw position, remove the motor and see if the noise is still present.
3. See if the ball screw coupling half can be turned by hand.
This should at least indicate where the problem is located - radial bearing, ball screw/table assembly, or motor. If the noise is generated from the ball screw assembly and the table moves freely, then the thrust bearing should be removed and examined.
I've had the radial bearing go out causing a noise to be generated, and a lube line failure causing the front way to freeze up causing noise. Never had the motor to go out yet, so cannot comment on its sound. However, the motor has been removed on occasion, brushes removed and blown out to remove the carbon dust.